Pub Date : 2023-07-27DOI: 10.3389/fagro.2023.1175524
J. H. Cafiero, María Salvetti Casasco, M. Lozano, C. Vacca, Silvina Laura López García, W. Draghi, A. Lagares, M. F. Del Papa
The growth and persistence of alfalfa (Medicago sativa), a perennial legume capable of producing high yields of high-quality forage, is reduced in moderately acidic soils. The low performance of alfalfa at low pH is due to numerous factors that affect the host plant, their rhizobia, and the symbiotic interaction. Sinorhizobium meliloti LPU63 was isolated from acid topsoil (in Argentina) and showed to be a highly competitive and efficient N2-fixing rhizobium under both neutral and moderately acidic soil conditions. In this study, we obtained a draft of the LPU63 genome sequence using Illumina HiSeq4000. The whole genome phylogenetic analysis confirmed the taxonomic position of LPU63 as a S. meliloti strain and the multilocus sequence analysis confirmed that LPU63 is not related to the strains used in Argentina in bioformulations. The genomic analysis showed that beyond the canonical chromosome, pSymA, and pSymB, LPU63 strain has an accessory plasmid that codes for a repABC origin of replication and a conjugative T4SS, suggesting that this plasmid could be self-transmissible. In addition, the complete denitrification pathway (i.e., the gene clusters nap, nir, nor, and nos), including napC and nosZ, which could be used as an alternative respiration route under hypoxic conditions with moderate N2O emissions was found. Also, genes associated with plant growth-promoting activities (PGPR) and the degradation of phenylacetic acid (PAA) were identified. LPU63 is a highly melanogenic strain, a property that could enhance its survival under soil conditions, and the genome data showed a particular arrangement of the genes involved in melanin production. The information regarding LPU63 activities compatible with plant-growth promotion phenotypes, together with other characteristics mentioned here (melanin production, potential moderate N2O emissions), constitute the basis of future experiments toward the rational design of a novel bioinoculant for the environmentally sustainable production of alfalfa.
{"title":"Genomic analysis of Sinorhizobium meliloti LPU63, an acid-tolerant and symbiotically efficient alfalfa-nodulating rhizobia","authors":"J. H. Cafiero, María Salvetti Casasco, M. Lozano, C. Vacca, Silvina Laura López García, W. Draghi, A. Lagares, M. F. Del Papa","doi":"10.3389/fagro.2023.1175524","DOIUrl":"https://doi.org/10.3389/fagro.2023.1175524","url":null,"abstract":"The growth and persistence of alfalfa (Medicago sativa), a perennial legume capable of producing high yields of high-quality forage, is reduced in moderately acidic soils. The low performance of alfalfa at low pH is due to numerous factors that affect the host plant, their rhizobia, and the symbiotic interaction. Sinorhizobium meliloti LPU63 was isolated from acid topsoil (in Argentina) and showed to be a highly competitive and efficient N2-fixing rhizobium under both neutral and moderately acidic soil conditions. In this study, we obtained a draft of the LPU63 genome sequence using Illumina HiSeq4000. The whole genome phylogenetic analysis confirmed the taxonomic position of LPU63 as a S. meliloti strain and the multilocus sequence analysis confirmed that LPU63 is not related to the strains used in Argentina in bioformulations. The genomic analysis showed that beyond the canonical chromosome, pSymA, and pSymB, LPU63 strain has an accessory plasmid that codes for a repABC origin of replication and a conjugative T4SS, suggesting that this plasmid could be self-transmissible. In addition, the complete denitrification pathway (i.e., the gene clusters nap, nir, nor, and nos), including napC and nosZ, which could be used as an alternative respiration route under hypoxic conditions with moderate N2O emissions was found. Also, genes associated with plant growth-promoting activities (PGPR) and the degradation of phenylacetic acid (PAA) were identified. LPU63 is a highly melanogenic strain, a property that could enhance its survival under soil conditions, and the genome data showed a particular arrangement of the genes involved in melanin production. The information regarding LPU63 activities compatible with plant-growth promotion phenotypes, together with other characteristics mentioned here (melanin production, potential moderate N2O emissions), constitute the basis of future experiments toward the rational design of a novel bioinoculant for the environmentally sustainable production of alfalfa.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43507285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-27DOI: 10.3389/fagro.2023.1057211
S. Ricart, R. Villar, M. Hernández-Hernández, Antonio M. Rico-Amorós, J. Olcina-Cantos, C. Baños
The Hydrosocial Cycle (HSC) has been widely applied and discussed as a consolidated research line to rethink the contemporary challenges that condition the urban and agroecosystem nexus. However, additional research directions are still open to guide policy and decision-makers in reinforcing stakeholders’ engagement and interaction to resolve tensions between water demands. This perspective paper suggests updating the HSC approach to improve the analysis of stakeholder interaction when addressing water scarcity in waterscapes. After briefly review the most relevant contributions of the HSC approach in the last two decades, we develop a preliminary framework to reinforce stakeholders’ interdependence analysis by designing a questionnaire to synthesize five main behavioral patterns conditioning stakeholders’ interactions: relevance, representativeness, recognition, assessment, and collaboration. Then, each pattern is organized in a triple-loop approach: to be, to do, and to share to characterize the mutual (mis)understanding of the stakeholders. The results of its application to Benidorm (south of Spain), a mass-tourism destination coexisting with rural development in tension for water supply, exemplified how 1) most stakeholders consider themselves important, but some of them are unaware of the role of others, 2) all stakeholders receive a higher punctuation in terms of functions rather than actions, and 3) all stakeholders agree on the benefits of the predisposition of parties (willingness) to achieve agreements in the short or medium term. Future research should consider how to address the lack of representativeness and power imbalance together with mechanisms to reinforce longitudinal studies in which actions from stakeholders could be contrasted.
{"title":"Reinforcing the Hydrosocial Cycle to foster water governance and stakeholders’ interdependence in urban agroecosystems: a local test in Benidorm, Spain","authors":"S. Ricart, R. Villar, M. Hernández-Hernández, Antonio M. Rico-Amorós, J. Olcina-Cantos, C. Baños","doi":"10.3389/fagro.2023.1057211","DOIUrl":"https://doi.org/10.3389/fagro.2023.1057211","url":null,"abstract":"The Hydrosocial Cycle (HSC) has been widely applied and discussed as a consolidated research line to rethink the contemporary challenges that condition the urban and agroecosystem nexus. However, additional research directions are still open to guide policy and decision-makers in reinforcing stakeholders’ engagement and interaction to resolve tensions between water demands. This perspective paper suggests updating the HSC approach to improve the analysis of stakeholder interaction when addressing water scarcity in waterscapes. After briefly review the most relevant contributions of the HSC approach in the last two decades, we develop a preliminary framework to reinforce stakeholders’ interdependence analysis by designing a questionnaire to synthesize five main behavioral patterns conditioning stakeholders’ interactions: relevance, representativeness, recognition, assessment, and collaboration. Then, each pattern is organized in a triple-loop approach: to be, to do, and to share to characterize the mutual (mis)understanding of the stakeholders. The results of its application to Benidorm (south of Spain), a mass-tourism destination coexisting with rural development in tension for water supply, exemplified how 1) most stakeholders consider themselves important, but some of them are unaware of the role of others, 2) all stakeholders receive a higher punctuation in terms of functions rather than actions, and 3) all stakeholders agree on the benefits of the predisposition of parties (willingness) to achieve agreements in the short or medium term. Future research should consider how to address the lack of representativeness and power imbalance together with mechanisms to reinforce longitudinal studies in which actions from stakeholders could be contrasted.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42349276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-24DOI: 10.3389/fagro.2023.1235168
M. Akinyuwa, Bailee K. Price, K. Martin, Sung-Hwan Kang
Cotton is a multipurpose crop grown globally, including the United States. Cotton leafroll dwarf virus (CLRDV), a phloem-limited virus (Solemoviridae) transmitted by aphids, causes significant economic losses to cotton cultivation. CLRDV strains (CLRDV-typical and atypical) that were previously prevalent in other countries cause severe symptoms leading to high yield loss. Recently, a new isolate of CLRDV (CLRDV-AL) has been characterized from infected cotton plants in Alabama that are often asymptomatic and difficult to detect, implying a low titer and pathogenicity within the host. Different pathogenicity among certain strains within the same species often correlates with both environmental and molecular factors. Thus, better management and control of the vector-borne disease can be achieved by elucidating host-pathogen interaction, such as host immune response and pathogen counter-response. In this study, we demonstrate the ability of CLRDV-AL to suppress a major host defense response known as RNA silencing and compare the potency of silencing suppression to other strains of the same virus. Also, we discuss the difference in pathogenicity among them by evaluating the observations based on the amino acid variation within the functional domain. Our study provides and suggests a future direction for specifying the strategy to mitigate potential cotton disease severity.
{"title":"A newly isolated cotton-infecting Polerovirus with cryptic pathogenicity encodes a weak suppressor of RNA silencing","authors":"M. Akinyuwa, Bailee K. Price, K. Martin, Sung-Hwan Kang","doi":"10.3389/fagro.2023.1235168","DOIUrl":"https://doi.org/10.3389/fagro.2023.1235168","url":null,"abstract":"Cotton is a multipurpose crop grown globally, including the United States. Cotton leafroll dwarf virus (CLRDV), a phloem-limited virus (Solemoviridae) transmitted by aphids, causes significant economic losses to cotton cultivation. CLRDV strains (CLRDV-typical and atypical) that were previously prevalent in other countries cause severe symptoms leading to high yield loss. Recently, a new isolate of CLRDV (CLRDV-AL) has been characterized from infected cotton plants in Alabama that are often asymptomatic and difficult to detect, implying a low titer and pathogenicity within the host. Different pathogenicity among certain strains within the same species often correlates with both environmental and molecular factors. Thus, better management and control of the vector-borne disease can be achieved by elucidating host-pathogen interaction, such as host immune response and pathogen counter-response. In this study, we demonstrate the ability of CLRDV-AL to suppress a major host defense response known as RNA silencing and compare the potency of silencing suppression to other strains of the same virus. Also, we discuss the difference in pathogenicity among them by evaluating the observations based on the amino acid variation within the functional domain. Our study provides and suggests a future direction for specifying the strategy to mitigate potential cotton disease severity.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43713388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-20DOI: 10.3389/fagro.2023.1218824
Bikash Kumar Rajak, Priyanka Rani, Pranabesh Mandal, R. S. Chhokar, Nitesh Singh, Durg Vijay Singh
Acetyl-CoA carboxylase (ACCase: EC 6.4.1.2) is one of the essential biotins containing enzymes required by plants for fatty acid synthesis and elongation. The unique enzyme is present in its homomeric form in all the Gramineae family, making it a suitable target for developing herbicides selectively against weeds of the Gramineae family. One such example is infestation of Phalaris minor in winter wheat crop fields, where aryloxyphenoxypropionates (FOP); cyclohexanediones (DIM) and phenyl pyrazoline (DEN) group of ACCase inhibiting herbicides are used. However, the increasing number of ACCase herbicide resistant weed populations has compelled agro-scientists to seek varied possibilities for weed control, through Integrated Weed Management (IWM) strategies. Developing new potential herbicides to regain sensitivity in weeds could be an approach to weed control. The current advancement in computational techniques could be of aid in developing new herbicide-like molecules by exploring the genomics, proteomics and structural details of catalytic sites of herbicide action in crops as well as weeds.
{"title":"Emerging possibilities in the advancement of herbicides to combat acetyl-CoA carboxylase inhibitor resistance","authors":"Bikash Kumar Rajak, Priyanka Rani, Pranabesh Mandal, R. S. Chhokar, Nitesh Singh, Durg Vijay Singh","doi":"10.3389/fagro.2023.1218824","DOIUrl":"https://doi.org/10.3389/fagro.2023.1218824","url":null,"abstract":"Acetyl-CoA carboxylase (ACCase: EC 6.4.1.2) is one of the essential biotins containing enzymes required by plants for fatty acid synthesis and elongation. The unique enzyme is present in its homomeric form in all the Gramineae family, making it a suitable target for developing herbicides selectively against weeds of the Gramineae family. One such example is infestation of Phalaris minor in winter wheat crop fields, where aryloxyphenoxypropionates (FOP); cyclohexanediones (DIM) and phenyl pyrazoline (DEN) group of ACCase inhibiting herbicides are used. However, the increasing number of ACCase herbicide resistant weed populations has compelled agro-scientists to seek varied possibilities for weed control, through Integrated Weed Management (IWM) strategies. Developing new potential herbicides to regain sensitivity in weeds could be an approach to weed control. The current advancement in computational techniques could be of aid in developing new herbicide-like molecules by exploring the genomics, proteomics and structural details of catalytic sites of herbicide action in crops as well as weeds.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45394332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-20DOI: 10.3389/fagro.2023.1233255
E. Nartey, N. Sulemana, Awudu Razak, T. Adjadeh, A. M. Akumah, C. Amoatey, M. Abekoe
The main constraint to cowpea, Vigna unguiculata, production in West Africa is unavailability of applied phosphorus due to ligand exchange with clay minerals and precipitation reactions facilitated by low pH and low organic matter.To overcome this challenge, cow dung biochar (CB) and poultry litter biochar (PB) were applied as P sources for cowpea cultivation in Plinthustult and Kandiustalf soil in Ghana. The biochar types and triple super phosphate (TSP) were applied to meet the standard phosphorus requirement (SPR) and ½ SPR of the soils. Basal K from KCl was added to the TSP treatment. In addition to a non-amended soil, the treatments were triplicated and arranged in a completely randomized design in a screen house for an efficacy trial using cowpea as the test crop. Moisture content was maintained at 80% field capacity.Hundred cowpea seed weight was 20.3 g and 19.6 g for the TSP-amended Plinthustult at SPR and ½ SPR, respectively. This increased to 25.1 g and approximately 27 g at SPR and ½ SPR in the CB- and PB-amended Plinthustult, respectively. Hundred seed weight for TSP at both rates was similar in the two soils. The PB-amended Kandiustalf at SPR had seed with a weight of 27.02 g, 1.1 g heavier than the ½ SPR. The CB-amended Kandiustalf at both rates had 100 seeds weighing 25 g. Residual available P was 334.2 mg/kg and 213.2 mg/kg at SPR and ½ SPR, respectively, in the Plinthustult as opposed to a paltry 2.5 mg/kg at SPR in the TSP counterpart. The study recommends for the two biochar types to be applied at ½ SPR.
{"title":"Poultry litter and cow dung biochar as P sources for cowpea cultivation in two Ghanaian soils","authors":"E. Nartey, N. Sulemana, Awudu Razak, T. Adjadeh, A. M. Akumah, C. Amoatey, M. Abekoe","doi":"10.3389/fagro.2023.1233255","DOIUrl":"https://doi.org/10.3389/fagro.2023.1233255","url":null,"abstract":"The main constraint to cowpea, Vigna unguiculata, production in West Africa is unavailability of applied phosphorus due to ligand exchange with clay minerals and precipitation reactions facilitated by low pH and low organic matter.To overcome this challenge, cow dung biochar (CB) and poultry litter biochar (PB) were applied as P sources for cowpea cultivation in Plinthustult and Kandiustalf soil in Ghana. The biochar types and triple super phosphate (TSP) were applied to meet the standard phosphorus requirement (SPR) and ½ SPR of the soils. Basal K from KCl was added to the TSP treatment. In addition to a non-amended soil, the treatments were triplicated and arranged in a completely randomized design in a screen house for an efficacy trial using cowpea as the test crop. Moisture content was maintained at 80% field capacity.Hundred cowpea seed weight was 20.3 g and 19.6 g for the TSP-amended Plinthustult at SPR and ½ SPR, respectively. This increased to 25.1 g and approximately 27 g at SPR and ½ SPR in the CB- and PB-amended Plinthustult, respectively. Hundred seed weight for TSP at both rates was similar in the two soils. The PB-amended Kandiustalf at SPR had seed with a weight of 27.02 g, 1.1 g heavier than the ½ SPR. The CB-amended Kandiustalf at both rates had 100 seeds weighing 25 g. Residual available P was 334.2 mg/kg and 213.2 mg/kg at SPR and ½ SPR, respectively, in the Plinthustult as opposed to a paltry 2.5 mg/kg at SPR in the TSP counterpart. The study recommends for the two biochar types to be applied at ½ SPR.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46877189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-20DOI: 10.3389/fagro.2023.1195761
Ammar B. Bhandari, Tulsi P. Kharel, K. N. Reddy
Yield loss due to natural disasters, such as storms with high-speed winds and rainfall, can significantly damage standing corn (Zea mays L.) plants and yield. Using a geospatial approach, the study aimed to estimate green snap wind damage to corn and assess potential yield and economic loss in the Mississippi Delta. Midseason corn (V12–V14) snapping occurred on 8 June 2022. We recorded green snap damage in 13 fields [1.0 to 2.0 hectares (ha−1)] with low (224 kg ha−1) and high (336 kg ha−1) N rates and two different row orientations (north–south and east–west) after the damage. The results indicated no nitrogen rates or row orientation effect on green snap damage. The average yield loss could be ~29.25 kg ha−1, with every 1% increase in green snap wind damage causing significant economic loss to producers. Research methods can help scientists to estimate potential green snap yield loss due to severe winds in the larger fields. Research results can also help estimate potential yield and economic loss to assist producers and other stakeholders in decision-making to prepare for changing weather patterns and unprecedented severe windstorms in the future.
自然灾害造成的产量损失，如具有高速风和降雨的风暴，会严重损害立木玉米(Zea mays L.)植株和产量。利用地理空间方法，该研究旨在估计绿暴风对玉米的损害，并评估密西西比三角洲的潜在产量和经济损失。季中玉米(V12-V14)发生在2022年6月8日。我们在13块田地[1.0 ~ 2.0公顷(ha - 1)]中记录了绿脆损害，在损害后，低氮(224 kg ha - 1)和高氮(336 kg ha - 1)和两种不同的行向(南北和东西)。结果表明，施氮量和行向对青脆危害无显著影响。平均产量损失约为29.25 kg ha - 1，绿脆风害每增加1%，对生产者造成重大经济损失。研究方法可以帮助科学家估计由于大面积强风造成的潜在绿脆产量损失。研究结果还可以帮助估计潜在产量和经济损失，以帮助生产者和其他利益攸关方做出决策，为未来不断变化的天气模式和前所未有的强风暴做好准备。
{"title":"Assessing wind damage and potential yield loss in mid-season corn using a geospatial approach","authors":"Ammar B. Bhandari, Tulsi P. Kharel, K. N. Reddy","doi":"10.3389/fagro.2023.1195761","DOIUrl":"https://doi.org/10.3389/fagro.2023.1195761","url":null,"abstract":"Yield loss due to natural disasters, such as storms with high-speed winds and rainfall, can significantly damage standing corn (Zea mays L.) plants and yield. Using a geospatial approach, the study aimed to estimate green snap wind damage to corn and assess potential yield and economic loss in the Mississippi Delta. Midseason corn (V12–V14) snapping occurred on 8 June 2022. We recorded green snap damage in 13 fields [1.0 to 2.0 hectares (ha−1)] with low (224 kg ha−1) and high (336 kg ha−1) N rates and two different row orientations (north–south and east–west) after the damage. The results indicated no nitrogen rates or row orientation effect on green snap damage. The average yield loss could be ~29.25 kg ha−1, with every 1% increase in green snap wind damage causing significant economic loss to producers. Research methods can help scientists to estimate potential green snap yield loss due to severe winds in the larger fields. Research results can also help estimate potential yield and economic loss to assist producers and other stakeholders in decision-making to prepare for changing weather patterns and unprecedented severe windstorms in the future.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48825850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-10DOI: 10.3389/fagro.2023.1177461
Kara Hettinger, Z. Miller, Kyrstan L. Hubbel, Tim F. Seipel
Convolvulus arvensis L. Scop. (field bindweed) is a difficult weed to manage in organic cropping systems. Convolvulus arvensis suppression often requires intensive tillage and cultivation practices that have negative impacts on soil quality. To improve C. arvensis management in organic, small grain cropping systems, we compared ten cropping system treatments in a field trial from the autumn of 2017 until harvest of 2020 in Corvallis, MT, USA. Cropping system treatments varied along a gradient of tillage and crop competition, with tillage intensity and competition inversely related. High soil disturbance and no competition occurred in two treatments that remained in tilled fallow for two consecutive years. Six cropping system treatments had different combinations of tillage and annual or biennial crops, including wheat and forages. Two treatments had minimal soil disturbance and maximum competition from two consecutive years of perennial alfalfa. Convolvulus arvensis ramet density was counted annually to estimate changes in treatments over time. Differences in soil chemical and physical properties between treatments were also assessed in the final years of the study. In the first two years, there was no difference in C. arvensis ramet density among cropping system treatments. In the final two years of the study, C. arvensis density remained below one ramet per m2 in intensively tilled fallow treatments and perennial alfalfa treatments, but was much more variable in treatments with more diverse annual and biennial crop rotations with minimal to moderate tillage. The only differences between treatments in soil physical and chemical properties was aggregate stability. Soil from the most intensively tilled fallow treatments had lower soil aggregate stability than six other treatments, indicating higher erosion potential. Our results suggest that annual cropping systems can lead to increased C. arvensis density. Incorporating a perennial forage or an intensively tilled fallow period can prevent C. arvensis expansion in small grain organic cropping systems, but the perennial forage can protect and enhance soil quality.
{"title":"Crop rotation and cultivation effects on Convolvulus arvensis population dynamics in small grain organic cropping systems","authors":"Kara Hettinger, Z. Miller, Kyrstan L. Hubbel, Tim F. Seipel","doi":"10.3389/fagro.2023.1177461","DOIUrl":"https://doi.org/10.3389/fagro.2023.1177461","url":null,"abstract":"Convolvulus arvensis L. Scop. (field bindweed) is a difficult weed to manage in organic cropping systems. Convolvulus arvensis suppression often requires intensive tillage and cultivation practices that have negative impacts on soil quality. To improve C. arvensis management in organic, small grain cropping systems, we compared ten cropping system treatments in a field trial from the autumn of 2017 until harvest of 2020 in Corvallis, MT, USA. Cropping system treatments varied along a gradient of tillage and crop competition, with tillage intensity and competition inversely related. High soil disturbance and no competition occurred in two treatments that remained in tilled fallow for two consecutive years. Six cropping system treatments had different combinations of tillage and annual or biennial crops, including wheat and forages. Two treatments had minimal soil disturbance and maximum competition from two consecutive years of perennial alfalfa. Convolvulus arvensis ramet density was counted annually to estimate changes in treatments over time. Differences in soil chemical and physical properties between treatments were also assessed in the final years of the study. In the first two years, there was no difference in C. arvensis ramet density among cropping system treatments. In the final two years of the study, C. arvensis density remained below one ramet per m2 in intensively tilled fallow treatments and perennial alfalfa treatments, but was much more variable in treatments with more diverse annual and biennial crop rotations with minimal to moderate tillage. The only differences between treatments in soil physical and chemical properties was aggregate stability. Soil from the most intensively tilled fallow treatments had lower soil aggregate stability than six other treatments, indicating higher erosion potential. Our results suggest that annual cropping systems can lead to increased C. arvensis density. Incorporating a perennial forage or an intensively tilled fallow period can prevent C. arvensis expansion in small grain organic cropping systems, but the perennial forage can protect and enhance soil quality.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49369375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-07DOI: 10.3389/fagro.2023.1219490
J. O. Omondi, S. Mkuhlani, Jane W. Mugo, A. M. Chibeba, M. Chiduwa, G. Chigeza, S. Kyei-Boahen, P. Masikati, I. Nyagumbo
Smallholder farmers in Sub-Saharan Africa (SSA) are increasingly producing soybean for food, feed, cash, and soil fertility improvement. Yet, the difference between the smallholder farmers’ yield and either the attainable in research fields or the potential from crop models is wide. Reasons for the yield gap include low to nonapplication of appropriate fertilizers and inoculants, late planting, low plant populations, recycling seeds, etc.Here, we reviewed the literature on the yield gap and the technologies for narrowing it and modelled yields through the right sowing dates and suitable high-yielding varieties in APSIM.Results highlighted that between 2010 and 2020 in SSA, soybean production increased; however, it was through an expansion in the cropped area rather than a yield increase per hectare. Also, the actual smallholder farmers’ yield was 3.8, 2.2, and 2.3 times lower than the attainable yield in Malawi, Zambia, and Mozambique, respectively. Through inoculants, soybean yield increased by 23.8%. Coupling this with either 40 kg ha−1 of P or 60 kg ha−1 of K boosted the yields by 89.1% and 26.0%, respectively. Overall, application of 21–30 kg ha-1 of P to soybean in SSA could increase yields by about 48.2%. Furthermore, sowing at the right time increased soybean yield by 300%. Although these technologies enhance soybean yields, they are not fully embraced by smallholder farmers. Hence, refining and bundling them in a digital advisory tool will enhance the availability of the correct information to smallholder farmers at the right time and improve soybean yields per unit area.
撒哈拉以南非洲（SSA）的小农户越来越多地生产用于食品、饲料、现金和土壤肥力改善的大豆。然而，小农户的产量与研究领域可达到的产量或作物模型的潜力之间的差异很大。产量差距的原因包括施用适当的肥料和接种剂的量少或不施用、种植后期、植物种群少、种子回收等。在此，我们回顾了有关产量差距的文献和缩小产量差距的技术，并通过APSIM中合适的播播日期和合适的高产品种对产量进行了建模。研究结果强调，在2010年至2020年期间，SSA的大豆产量有所增加；然而，这是通过种植面积的扩大，而不是每公顷产量的增加。此外，马拉维、赞比亚和莫桑比克的实际小农户产量分别比可达到的产量低3.8倍、2.2倍和2.3倍。通过接种，大豆产量提高了23.8%。与40 kg ha−1的P或60 kg ha−l的K相结合，产量分别提高了89.1%和26.0%。总的来说，在SSA中向大豆施用21–30 kg ha-1磷可使产量提高约48.2%。此外，适时播种可使大豆产量提高300%。尽管这些技术提高了大豆产量，但它们并没有被小农户完全接受。因此，将其提炼并捆绑在数字咨询工具中，将提高小农户在正确时间获得正确信息的能力，并提高单位面积大豆产量。
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Pub Date : 2023-07-05DOI: 10.3389/fagro.2023.1215441
Nawal Taaime, Sifeddine Rafik, Khalil El Mejahed, A. Oukarroum, R. Choukr-allah, R. Bouabid, M. El Gharous
Quinoa (Chenopodium quinoa Wild.) is a drought and salinity-tolerant crop that originated in the Andes over 7000 years ago. It is adapted to different agroecological areas and can be grown from sea level to an altitude of 4000 m. The outstanding nutritional status of quinoa, with its high content of proteins, vitamins, and minerals, makes it a promising crop able to combat hunger and malnutrition in different countries in the 21st century. Quinoa cultivation has expanded from South America to Africa, Europe, Asia, and North America. Reviewing quinoa cropping practices will provide farmers with adequate recommendations for improving the agronomic and environmental sustainability of quinoa cultivation worldwide. For this reason, we conducted a systematic review of agronomic management practices in 148 field experiments conducted worldwide from 2000 to 2022. The collected data from the literature were analyzed and presented by location to determine high-performing genotypes, optimal planting dates, and other adequate cropping practices affecting quinoa performance and yield. Results showed that quinoa could be successfully cultivated in the new farming areas. Quinoa yields were higher than those reported in its place of origin, ranging from 108 kg ha-1, obtained by KU-2 in Washington State, to 9667 kg ha-1, obtained by Longli in China. Although quinoa is considered a crop with low input requirements, positive grain yield response was observed following increasing fertilization rates. Quinoa needs 2 to 4.6 kg of nitrogen to produce 1q of grain yield. In terms of phosphorus and potassium, quinoa needs 3.7 kg P2O5 and 4.3 kg K2O to produce 1 ton of total biomass. Quinoa has low water requirements (300-400 mm). However, a positive response was recorded with water quantities up to 866 mm. During our investigation, weed control in quinoa crop is still undeveloped and usually done manually. Research addressing this issue can increase quinoa yields and decrease the production cost. Downey mildew and birds’ attack are the major phytosanitary problems affecting quinoa grain yield. Other pests such as miners and aphids can also affect the health of quinoa, but their injury is not a serious problem. After the harvest, saponins found in the out layer of the seed can be removed through washing and mechanical pearling process, but the latter technic was found to be efficient and cost effective to reduce the saponin content. Our results constitute the first recommendation base for the adequate worldwide agronomic practices of quinoa crop.
藜麦(野生藜麦)是一种耐旱耐盐作物，起源于7000多年前的安第斯山脉。它适应于不同的农业生态区，从海平面到海拔4000米都可以种植。藜麦的蛋白质、维生素和矿物质含量高，具有突出的营养地位，使其成为21世纪各国抗击饥饿和营养不良的有前途的作物。藜麦种植已经从南美扩展到非洲、欧洲、亚洲和北美。审查藜麦种植方法将为农民提供适当的建议，以改善全球藜麦种植的农艺和环境可持续性。因此，我们对2000年至2022年在全球范围内进行的148项田间试验的农艺管理实践进行了系统回顾。对从文献中收集的数据进行分析，并按地点进行展示，以确定高效基因型、最佳种植日期以及其他影响藜麦性能和产量的适当种植方法。结果表明，藜麦可在新农区成功种植。藜麦产量高于其原产地报告，从华盛顿州KU-2获得的108 kg ha-1到中国龙利获得的9667 kg ha-1。虽然藜麦被认为是一种投入需求低的作物，但在增加施肥量后，观察到籽粒产量的正响应。藜麦需要2到4.6公斤的氮才能产生1q的粮食产量。在磷和钾方面，藜麦需要3.7 kg P2O5和4.3 kg K2O来产生1吨总生物量。藜麦需水量低(300-400毫米)。然而，当水量达到866毫米时，记录了积极的反应。在我们的调查中，藜麦作物的杂草控制仍然不发达，通常是人工控制。解决这一问题的研究可以提高藜麦产量并降低生产成本。唐尼霉病和鸟类侵染是影响藜麦籽粒产量的主要植物检疫问题。其他害虫，如矿工和蚜虫也会影响藜麦的健康，但它们的伤害不是一个严重的问题。在收获后，可以通过清洗和机械珍珠工艺去除种子外层的皂苷，但发现后一种技术可以有效地降低皂苷的含量。我们的研究结果为藜麦作物在世界范围内适当的农艺实践提供了第一个推荐基础。
{"title":"Worldwide development of agronomic management practices for quinoa cultivation: a systematic review","authors":"Nawal Taaime, Sifeddine Rafik, Khalil El Mejahed, A. Oukarroum, R. Choukr-allah, R. Bouabid, M. El Gharous","doi":"10.3389/fagro.2023.1215441","DOIUrl":"https://doi.org/10.3389/fagro.2023.1215441","url":null,"abstract":"Quinoa (Chenopodium quinoa Wild.) is a drought and salinity-tolerant crop that originated in the Andes over 7000 years ago. It is adapted to different agroecological areas and can be grown from sea level to an altitude of 4000 m. The outstanding nutritional status of quinoa, with its high content of proteins, vitamins, and minerals, makes it a promising crop able to combat hunger and malnutrition in different countries in the 21st century. Quinoa cultivation has expanded from South America to Africa, Europe, Asia, and North America. Reviewing quinoa cropping practices will provide farmers with adequate recommendations for improving the agronomic and environmental sustainability of quinoa cultivation worldwide. For this reason, we conducted a systematic review of agronomic management practices in 148 field experiments conducted worldwide from 2000 to 2022. The collected data from the literature were analyzed and presented by location to determine high-performing genotypes, optimal planting dates, and other adequate cropping practices affecting quinoa performance and yield. Results showed that quinoa could be successfully cultivated in the new farming areas. Quinoa yields were higher than those reported in its place of origin, ranging from 108 kg ha-1, obtained by KU-2 in Washington State, to 9667 kg ha-1, obtained by Longli in China. Although quinoa is considered a crop with low input requirements, positive grain yield response was observed following increasing fertilization rates. Quinoa needs 2 to 4.6 kg of nitrogen to produce 1q of grain yield. In terms of phosphorus and potassium, quinoa needs 3.7 kg P2O5 and 4.3 kg K2O to produce 1 ton of total biomass. Quinoa has low water requirements (300-400 mm). However, a positive response was recorded with water quantities up to 866 mm. During our investigation, weed control in quinoa crop is still undeveloped and usually done manually. Research addressing this issue can increase quinoa yields and decrease the production cost. Downey mildew and birds’ attack are the major phytosanitary problems affecting quinoa grain yield. Other pests such as miners and aphids can also affect the health of quinoa, but their injury is not a serious problem. After the harvest, saponins found in the out layer of the seed can be removed through washing and mechanical pearling process, but the latter technic was found to be efficient and cost effective to reduce the saponin content. Our results constitute the first recommendation base for the adequate worldwide agronomic practices of quinoa crop.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45762747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-04DOI: 10.3389/fagro.2023.1212705
Kayla Gaudet, N. Faraone, N. K. Hillier
The two-spotted spider mite, Tetranychus urticae Koch, is a globally distributed polyphagous agricultural pest that is resistant to a variety of synthetic chemical pesticides. Plant essential oils have been recognized as a novel natural source of pest control that have a reduced impact to the environment and human health relative to synthetic pesticides, and which may provide a viable alternative for managing this pest. The present study focuses on assessing the potential of mite semiochemicals and essential oil constitutes as repellents and miticides. We developed an innovative electrophysiological approach (electrotarsography) to record olfactory sensitivity of T. urticae. Additionally, a novel two-choice behavioural assay was designed to determine whether T. urticae is attracted or repelled by selected compounds. Using Gas Chromatography-linked Electrotarsal detection (GC-ETD), we determined that T. urticae can sense many terpenoids commonly found in plant essential oils, such as eucalyptol, thymol, and linalool. In addition, T. urticae responded to carboxylic acids and aldehydes, which are known to be detected by ionotropic receptors. In two-choice behavioural assays, T. urticae was repelled by various essential oil active ingredients, as well as carboxylic acids and aldehydes. The study provides much needed insight to identify behaviourally relevant chemical cues for the development of mite control strategies.
{"title":"Investigating chemoreception and behavioural responses of Tetranychus urticae (Trombidiformes: Tetranychidae) to organic acids, aldehydes and essential oil components","authors":"Kayla Gaudet, N. Faraone, N. K. Hillier","doi":"10.3389/fagro.2023.1212705","DOIUrl":"https://doi.org/10.3389/fagro.2023.1212705","url":null,"abstract":"The two-spotted spider mite, Tetranychus urticae Koch, is a globally distributed polyphagous agricultural pest that is resistant to a variety of synthetic chemical pesticides. Plant essential oils have been recognized as a novel natural source of pest control that have a reduced impact to the environment and human health relative to synthetic pesticides, and which may provide a viable alternative for managing this pest. The present study focuses on assessing the potential of mite semiochemicals and essential oil constitutes as repellents and miticides. We developed an innovative electrophysiological approach (electrotarsography) to record olfactory sensitivity of T. urticae. Additionally, a novel two-choice behavioural assay was designed to determine whether T. urticae is attracted or repelled by selected compounds. Using Gas Chromatography-linked Electrotarsal detection (GC-ETD), we determined that T. urticae can sense many terpenoids commonly found in plant essential oils, such as eucalyptol, thymol, and linalool. In addition, T. urticae responded to carboxylic acids and aldehydes, which are known to be detected by ionotropic receptors. In two-choice behavioural assays, T. urticae was repelled by various essential oil active ingredients, as well as carboxylic acids and aldehydes. The study provides much needed insight to identify behaviourally relevant chemical cues for the development of mite control strategies.","PeriodicalId":34038,"journal":{"name":"Frontiers in Agronomy","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46279501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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