Pub Date : 2023-03-17DOI: 10.47280/revfacagron(luz).v40.n2.01
Y. Méndez-Martínez, Estefanía Pallo-Molina, Angel Fernández-Escobar, Diana Vasco-Mora
With the objective of evaluating different biological and metabolic indicators in males and females Pseudocurimata boulengeri in three ecosystems of Los Ríos, Ecuador, specimens were captured in the areas of Ventana, Quevedo and Buena Fe (60 per area, 180 total), and proceeded to perform the sexing. The following were determined: size, weight, thickness of the head, trunk and tail, as well as the size-weight relationship. Stomasomatic, gonadal, hepatosomatic, vicerosomatic indices and condition factor. Glucose, total protein, cholesterol and triglyceride were also evaluated. A 3×2 factorial arrangement was used. Regression analysis to establish the functional relationship between length and weight. For the morphometric indicators, differences between interactions were shown, although higher values were observed in females regardless of the locality, with a weight of 185 g, a length of 23.43 cm and head thickness that exceeded 6 cm. The biological indices reflected differences between the interactions, thus the hepatosomatic, gonadal, and vicerosomatic indexes were higher for females in the locality of Ventanas with 0.97, 12.76, and 20.04, respectively. For the metabolic indicators, differences were shown between the interactions with greater variability for sex. It was shown that for the morphometric indicators, sex did not prevail. The biological indices were influenced by sex, with superiority for females except the stomasomatic. While metabolic indicators showed variability with respect to areas and sex.
{"title":"Comparative study of biological and metabolic indicators in males and females Pseudocurimata boulengeri of lotic ecosystems","authors":"Y. Méndez-Martínez, Estefanía Pallo-Molina, Angel Fernández-Escobar, Diana Vasco-Mora","doi":"10.47280/revfacagron(luz).v40.n2.01","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n2.01","url":null,"abstract":"With the objective of evaluating different biological and metabolic indicators in males and females Pseudocurimata boulengeri in three ecosystems of Los Ríos, Ecuador, specimens were captured in the areas of Ventana, Quevedo and Buena Fe (60 per area, 180 total), and proceeded to perform the sexing. The following were determined: size, weight, thickness of the head, trunk and tail, as well as the size-weight relationship. Stomasomatic, gonadal, hepatosomatic, vicerosomatic indices and condition factor. Glucose, total protein, cholesterol and triglyceride were also evaluated. A 3×2 factorial arrangement was used. Regression analysis to establish the functional relationship between length and weight. For the morphometric indicators, differences between interactions were shown, although higher values were observed in females regardless of the locality, with a weight of 185 g, a length of 23.43 cm and head thickness that exceeded 6 cm. The biological indices reflected differences between the interactions, thus the hepatosomatic, gonadal, and vicerosomatic indexes were higher for females in the locality of Ventanas with 0.97, 12.76, and 20.04, respectively. For the metabolic indicators, differences were shown between the interactions with greater variability for sex. It was shown that for the morphometric indicators, sex did not prevail. The biological indices were influenced by sex, with superiority for females except the stomasomatic. While metabolic indicators showed variability with respect to areas and sex.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75346996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-08DOI: 10.47280/revfacagron(luz).v40.n1.10
C. García-Vélez, D. Chirinos, Jesús Centeno-Parrales, L. Cedeño, Darlinton Pin
Melon is attacked by pests such as the whitefly, Bemisia tabaci (Gennadius), the cotton aphid, Aphis gossypii Glover, the flower thrips, Frankliniella occidentalis (Pergande) as well as Diaphania worms that can affect yield and crop productivity. To control it, frequent spraying of organo-synthetic insecticides is carried out, which can generate ecological imbalances. During two productive cycles, experimental plots were established to test the effect of an organo-synthetic insecticide and a botanical one on some pests, a natural enemy and on melon productivity. The treatments tested were, 1. Organo-synthetic insecticide: lambda-cyhalothrin + thiamethoxam. 2. Botanical insecticide: azadirachtin. 3. Untreated plot. The populations of A. gossypii, B. tabaci, F. occidentalis, percentage of fruits damaged by Diaphania spp. (% FDD), and the effect on parasitism in B. tabaci (% PBT), as well as on yield (t.ha-1) and crop productivity. The populations of A. gossypii, B. tabaci, F. occidentalis, fruits damaged by Diaphania spp. (% FDD), and the effect on parasitism in B. tabaci (% PBT), as well as on crop yield and productivity. The % FDD, the populations of A. gossypii and F. occidentalis did not show differences between treatments. The yields were higher in plots treated with azadirachtin, where there were lower populations of B. tabaci and higher % PBT. Productivity presented a negative correlation with the populations of B. tabaci. Despite the control exerted by azadirachtin on B. tabaci, there was a decrease in productivity, which added to the damage of Diaphania spp. suggest the importance of these pests and for their management other alternatives should be tested that reduce populations to levels that do not affect yield and at the same time guarantee sustainable production.
{"title":"Effect of a synthetic insecticide and a botanical on pests, natural enemies and melon productivity","authors":"C. García-Vélez, D. Chirinos, Jesús Centeno-Parrales, L. Cedeño, Darlinton Pin","doi":"10.47280/revfacagron(luz).v40.n1.10","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.10","url":null,"abstract":"Melon is attacked by pests such as the whitefly, Bemisia tabaci (Gennadius), the cotton aphid, Aphis gossypii Glover, the flower thrips, Frankliniella occidentalis (Pergande) as well as Diaphania worms that can affect yield and crop productivity. To control it, frequent spraying of organo-synthetic insecticides is carried out, which can generate ecological imbalances. During two productive cycles, experimental plots were established to test the effect of an organo-synthetic insecticide and a botanical one on some pests, a natural enemy and on melon productivity. The treatments tested were, 1. Organo-synthetic insecticide: lambda-cyhalothrin + thiamethoxam. 2. Botanical insecticide: azadirachtin. 3. Untreated plot. The populations of A. gossypii, B. tabaci, F. occidentalis, percentage of fruits damaged by Diaphania spp. (% FDD), and the effect on parasitism in B. tabaci (% PBT), as well as on yield (t.ha-1) and crop productivity. The populations of A. gossypii, B. tabaci, F. occidentalis, fruits damaged by Diaphania spp. (% FDD), and the effect on parasitism in B. tabaci (% PBT), as well as on crop yield and productivity. The % FDD, the populations of A. gossypii and F. occidentalis did not show differences between treatments. The yields were higher in plots treated with azadirachtin, where there were lower populations of B. tabaci and higher % PBT. Productivity presented a negative correlation with the populations of B. tabaci. Despite the control exerted by azadirachtin on B. tabaci, there was a decrease in productivity, which added to the damage of Diaphania spp. suggest the importance of these pests and for their management other alternatives should be tested that reduce populations to levels that do not affect yield and at the same time guarantee sustainable production.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77376182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-27DOI: 10.47280/revfacagron(luz).v40.n1.09
Carlos Aguilar, F. Martínez, Isidro Zapata, J. Aguilar, Juan Zamora
The use of organic fertilizers contributes to the improvement of the fertility of agricultural soils. The objective was to evaluate three doses of organic fertilizer incorporated into the soil (10, 20 and 30 t.ha-1) and a control, in corn production. The management of the crop was conventional, after the preparation of the soil with agricultural machinery, the doses of compost were incorporated. Planting was manual with a density of 66,500 plants.ha-1. A completely randomized design and three replicates per treatment were used. Data were analyzed with analysis of variance, tests of means, correlation analysis, and economic evaluation. The results indicated that the incorporation of organic fertilizer to the soil benefited the height of the plant and ear, leaf area, stem diameter, number and yield of ears.ha-1. A direct and positive relationship was found between the dose of amendment incorporated into the soil and the production of ears in the milky-dough state. The application of 30 t.ha-1 of organic fertilizer showed the best results for the indicated agronomic variables and presented the best economic benefits.
{"title":"Evaluation of organic amendment in corn production in Villaflores, Chiapas, Mexico","authors":"Carlos Aguilar, F. Martínez, Isidro Zapata, J. Aguilar, Juan Zamora","doi":"10.47280/revfacagron(luz).v40.n1.09","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.09","url":null,"abstract":"The use of organic fertilizers contributes to the improvement of the fertility of agricultural soils. The objective was to evaluate three doses of organic fertilizer incorporated into the soil (10, 20 and 30 t.ha-1) and a control, in corn production. The management of the crop was conventional, after the preparation of the soil with agricultural machinery, the doses of compost were incorporated. Planting was manual with a density of 66,500 plants.ha-1. A completely randomized design and three replicates per treatment were used. Data were analyzed with analysis of variance, tests of means, correlation analysis, and economic evaluation. The results indicated that the incorporation of organic fertilizer to the soil benefited the height of the plant and ear, leaf area, stem diameter, number and yield of ears.ha-1. A direct and positive relationship was found between the dose of amendment incorporated into the soil and the production of ears in the milky-dough state. The application of 30 t.ha-1 of organic fertilizer showed the best results for the indicated agronomic variables and presented the best economic benefits.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76638676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-17DOI: 10.47280/revfacagron(luz).v40.n1.08
R. Ortega-Pérez, E. Toyes-Vargas, J. Espinoza-Villavicencio, A. Palacios-Espinosa, Juan J. Montes-Sánchez, B. Murillo-Amador
The objective is to determine the seasonal-diet effect (dry, rainy) on goats’ milk fatty acid profile reared on a farm with an intensive production system located in an arid zone of Mexico. In the rainy season, a group of 10 goats, Creole × Anglo-Nubian, consumed a diet composed exclusively of alfalfa hay (Medicago sativa). Meanwhile, in the dry season, a similar goat group ate a mixture of corn (Zea mays) and sorghum grains (Sorghum bicolor), and buffel grass hay (Cenchrus ciliaris) in a 1:1:1 ratio. The goats were between 90 and 180 days of lactation. The saturated, monounsaturated, polyunsaturated, and branched-chain fatty acids in milk were measured. The rainy-season milk showed a higher content of fatty acids; however, the contents of most types of fatty acids were not significant between seasons, except for the polyunsaturated (18:2 n-6, -linoleic acid) and highly unsaturated fatty acids (arachidonic, eicosapentaenoic, and docosahexaenoic acid).
{"title":"Fatty acid content of Creole-Nubia goat milk with different seasonal diets in an intensive\u0000feeding system in an arid region","authors":"R. Ortega-Pérez, E. Toyes-Vargas, J. Espinoza-Villavicencio, A. Palacios-Espinosa, Juan J. Montes-Sánchez, B. Murillo-Amador","doi":"10.47280/revfacagron(luz).v40.n1.08","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.08","url":null,"abstract":"The objective is to determine the seasonal-diet effect (dry, rainy) on goats’ milk fatty acid profile reared on a farm with an intensive production system located in an arid zone of Mexico. In the rainy season, a group of 10 goats, Creole × Anglo-Nubian, consumed a diet composed exclusively of alfalfa hay (Medicago sativa). Meanwhile, in the dry season, a similar goat group ate a mixture of corn (Zea mays) and sorghum grains (Sorghum bicolor), and buffel grass hay (Cenchrus ciliaris) in a 1:1:1 ratio. The goats were between 90 and 180 days of lactation. The saturated, monounsaturated, polyunsaturated, and branched-chain fatty acids in milk were measured. The rainy-season milk showed a higher content of fatty acids; however, the contents of most types of fatty acids were not significant between seasons, except for the polyunsaturated (18:2 n-6, -linoleic acid) and highly unsaturated fatty acids (arachidonic, eicosapentaenoic, and docosahexaenoic acid).","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79922800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-04DOI: 10.47280/revfacagron(luz).v40.n1.07
S. Benkadja, A. Oulmi, B. Frih, A. Guendouz, A. Benmahammed
Oxidative stress caused by glyphosate is a complex chemical and physiological phenomenon and develops as a result of overproduction and accumulation of reactive oxygen species (ROS). This study was carried out in vitro at the National Institute of Agronomic Research of Algeria (INRAA) Setif, to select the most susceptible durum wheat (Triticum durum L.) under oxidative stress induced by glyphosate herbicide by evaluating chlorophyll content degradation and cell membrane leakage. Genotypes showed significant variations in almost all the studied traits. The chlorophyll loss ratio ranged from 26.42 % for the genotype G5 to 48.75 % for the local variety Boutaleb, glyphosate sensitivity index values were found to be between 0.65-1.2, the advanced line G5 was found to be the most tolerant under oxidative stress with the lowest chlorophyll loss ratio and lowest Glyphosate sensitivity index. Furthermore, the advanced line G4 recorded the highest electrolyte leakage (80.16 %) while G6 showed the lowest estimate (50.77 %). Therefore, advanced lines G5 and G6 appear the most suitable for the growing conditions.
草甘膦引起的氧化应激是一种复杂的化学和生理现象，是活性氧(ROS)过量产生和积累的结果。本研究在阿尔及利亚国家农艺研究所(INRAA) Setif进行体外试验，通过评价叶绿素含量降解和细胞膜渗漏，筛选草甘膦除草剂诱导氧化应激下最敏感的硬粒小麦(Triticum durum L.)。基因型在几乎所有研究性状中都表现出显著差异。G5基因型的叶绿素损失率为26.42% ~ 48.75%，草甘膦敏感性指数在0.65 ~ 1.2之间，先进系G5对氧化胁迫的耐受性最强，叶绿素损失率最低，草甘膦敏感性指数最低。此外，先进生产线G4的漏液率最高(80.16%)，而G6的漏液率最低(50.77%)。因此，先进系G5和G6最适合生长条件。
{"title":"Evaluation of chlorophyll content and membrane stability under oxidative stress induced\u0000by glyphosate herbicide as indicators of drought tolerance in some advanced durum\u0000wheat (Triticum durum L.) lines: in vitro study","authors":"S. Benkadja, A. Oulmi, B. Frih, A. Guendouz, A. Benmahammed","doi":"10.47280/revfacagron(luz).v40.n1.07","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.07","url":null,"abstract":"Oxidative stress caused by glyphosate is a complex chemical and physiological phenomenon and develops as a result of overproduction and accumulation of reactive oxygen species (ROS). This study was carried out in vitro at the National Institute of Agronomic Research of Algeria (INRAA) Setif, to select the most susceptible durum wheat (Triticum durum L.) under oxidative stress induced by glyphosate herbicide by evaluating chlorophyll content degradation and cell membrane leakage. Genotypes showed significant variations in almost all the studied traits. The chlorophyll loss ratio ranged from 26.42 % for the genotype G5 to 48.75 % for the local variety Boutaleb, glyphosate sensitivity index values were found to be between 0.65-1.2, the advanced line G5 was found to be the most tolerant under oxidative stress with the lowest chlorophyll loss ratio and lowest Glyphosate sensitivity index. Furthermore, the advanced line G4 recorded the highest electrolyte leakage (80.16 %) while G6 showed the lowest estimate (50.77 %). Therefore, advanced lines G5 and G6 appear the most suitable for the growing conditions.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2023-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85795180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-05DOI: 10.47280/revfacagron(luz).v40.n1.06
J. Figueroa, B. Sánchez-Toledano, J. Zegbe
Sorghum is a cereal used as fodder, mainly. Despite being a beneficial product for human health, its consumption is little or null in Mexico. The food industry could be an alternative to diversify this cereal in products compatible with celiac people. The study was focused on the consumer's characterization and the sensory assessment of pancakes elaborated with various proportions of xanthan gum (GX) and the microbial transglutaminase (MTG) enzyme in two cities from the central and northeastern regions of Mexico. A survey, designed and validated previously, was given to 58 consumers where the demographic characteristics of participants and the sensory analysis of nine pancakes (P) were explored. The latter were prepared with the following proportions of GX/MTG: P1 (0/0 %), P2 (0/0.25 %), P3 (0/0.5 %), P4 (0.25/0 %), P5 (0.25/0.25 %), P6 (0.25/0.5 %), P7 (0.5/0 %), P8 (0.5/0.25 %), P9 (0.5/0.5 %) and a commercial pancake (control). The study revealed that the majority of the participants were women (77.5 %). The predominant age was between 20 and 29 years (51.7 %) with a university academic level (30.2 %) and postgraduate degree (38 %), and income ≥ $20,000 MXN (53.6 %). The most preferred and accepted pancakes were P9 and P7 followed by the control, P5 and P8. However, the most accepted pancake was the control followed by P7 and P9. It is concluded that sorghum pancakes represent an alternative with health benefits for people with celiac disease.
{"title":"Sensory analysis of pancakes made with sorghum flour, xanthan gum and microbial\u0000transglutaminase enzyme","authors":"J. Figueroa, B. Sánchez-Toledano, J. Zegbe","doi":"10.47280/revfacagron(luz).v40.n1.06","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.06","url":null,"abstract":"Sorghum is a cereal used as fodder, mainly. Despite being a beneficial product for human health, its consumption is little or null in Mexico. The food industry could be an alternative to diversify this cereal in products compatible with celiac people. The study was focused on the consumer's characterization and the sensory assessment of pancakes elaborated with various proportions of xanthan gum (GX) and the microbial transglutaminase (MTG) enzyme in two cities from the central and northeastern regions of Mexico. A survey, designed and validated previously, was given to 58 consumers where the demographic characteristics of participants and the sensory analysis of nine pancakes (P) were explored. The latter were prepared with the following proportions of GX/MTG: P1 (0/0 %), P2 (0/0.25 %), P3 (0/0.5 %), P4 (0.25/0 %), P5 (0.25/0.25 %), P6 (0.25/0.5 %), P7 (0.5/0 %), P8 (0.5/0.25 %), P9 (0.5/0.5 %) and a commercial pancake (control). The study revealed that the majority of the participants were women (77.5 %). The predominant age was between 20 and 29 years (51.7 %) with a university academic level (30.2 %) and postgraduate degree (38 %), and income ≥ $20,000 MXN (53.6 %). The most preferred and accepted pancakes were P9 and P7 followed by the control, P5 and P8. However, the most accepted pancake was the control followed by P7 and P9. It is concluded that sorghum pancakes represent an alternative with health benefits for people with celiac disease.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76275897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-26DOI: 10.47280/revfacagron(luz).v40.n1.05
Oriana Betancourt, X. Araneda, H. Pesenti, Leonardo Anabalón
Throughout the world, the use of industrial polymers derived from fossil fuels is practically inevitable because they have such a wide range of applications; however, the environmental problems arising from this practice have led to a search for alternatives which will allow their use to be reduced, as well as strategies for their control by degradation using biorganic active agents. Insects have been a focus of special interest, as some species consume plastics and may serve to biodegrade them through the action of bacteria in their digestive tracts. In this context, the object of the present study was to characterise bacteria present in the intestine of wax moth larvae (Galleria mellonella). Thirty larvae were subjected to a diet based on polystyrene foam and thirty larvae in natural diet for 7 days. Gastrointestinal tracts were extracted and PCR was run. The results showed the presence of bacterial cells of Carnobacterium maltaromaticum, Brevibacterium sandarakinum, Pseudomonas psychrophila, Pseudomonas sp., Providence sp., Corynebacterium sp. However, the real action of these groups of bacteria in the effective degradation of polymers must be verified.
{"title":"Identification of the gut bacteria of the greater wax moth","authors":"Oriana Betancourt, X. Araneda, H. Pesenti, Leonardo Anabalón","doi":"10.47280/revfacagron(luz).v40.n1.05","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.05","url":null,"abstract":"Throughout the world, the use of industrial polymers derived from fossil fuels is practically inevitable because they have such a wide range of applications; however, the environmental problems arising from this practice have led to a search for alternatives which will allow their use to be reduced, as well as strategies for their control by degradation using biorganic active agents. Insects have been a focus of special interest, as some species consume plastics and may serve to biodegrade them through the action of bacteria in their digestive tracts. In this context, the object of the present study was to characterise bacteria present in the intestine of wax moth larvae (Galleria mellonella). Thirty larvae were subjected to a diet based on polystyrene foam and thirty larvae in natural diet for 7 days. Gastrointestinal tracts were extracted and PCR was run. The results showed the presence of bacterial cells of Carnobacterium maltaromaticum, Brevibacterium sandarakinum, Pseudomonas psychrophila, Pseudomonas sp., Providence sp., Corynebacterium sp. However, the real action of these groups of bacteria in the effective degradation of polymers must be verified.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87864122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-26DOI: 10.47280/revfacagron(luz).v40.n1.04
Guido Sarmiento-Sarmiento, Horacio Manrique-Nuñez, Luis Lipa-Mamani
Imidacloprid is a neonicotinoid insecticide used to control insect pests in avocado (Persea americana); its excessive application could generate residues above the maximum residue limits (MRL) in the fruit, causing a serious health risk to consumers. The objective of this work was to determine the residues and dissipation of imidacloprid in avocado fruit, Hass variety. The treatments were the doses of Imidacloprid (0.5, 1.0 and 1.5 mL.L-1) under the commercial formulation Thunder 350SC and the forms of application (sprayed to foliage and drip at the foot of the plant). There were six treatments in a completely randomized experimental design with three replications and 18 experimental units (plants). Quantification was by HPLC (QuEChERS). The evaluations were carried out on two matrices (avocado fruit peel and pulp) at 1, 3, 7 and 14 days after the application of Imidacloprid. The application of the 0.5 mL.L-1 dose by drip at the foot of the plant resulted in lower residual and a higher percentage of dissipation in both matrices, higher daily dissipation rate in the pulp, with imidacloprid concentrations that did not exceed the MRL (0.7 mg.kg-1). The application of 1.5 mL.L-1 by spraying resulted in higher residual, and in a lower percentage of dissipation in both matrices, with imidacloprid concentrations in the peel exceeding the MRL at 7 and 14 days. In the pulp, none of the treatments exceeded the MRL.
{"title":"Residues and dissipation of imidacloprid in avocado fruit","authors":"Guido Sarmiento-Sarmiento, Horacio Manrique-Nuñez, Luis Lipa-Mamani","doi":"10.47280/revfacagron(luz).v40.n1.04","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.04","url":null,"abstract":"Imidacloprid is a neonicotinoid insecticide used to control insect pests in avocado (Persea americana); its excessive application could generate residues above the maximum residue limits (MRL) in the fruit, causing a serious health risk to consumers. The objective of this work was to determine the residues and dissipation of imidacloprid in avocado fruit, Hass variety. The treatments were the doses of Imidacloprid (0.5, 1.0 and 1.5 mL.L-1) under the commercial formulation Thunder 350SC and the forms of application (sprayed to foliage and drip at the foot of the plant). There were six treatments in a completely randomized experimental design with three replications and 18 experimental units (plants). Quantification was by HPLC (QuEChERS). The evaluations were carried out on two matrices (avocado fruit peel and pulp) at 1, 3, 7 and 14 days after the application of Imidacloprid. The application of the 0.5 mL.L-1 dose by drip at the foot of the plant resulted in lower residual and a higher percentage of dissipation in both matrices, higher daily dissipation rate in the pulp, with imidacloprid concentrations that did not exceed the MRL (0.7 mg.kg-1). The application of 1.5 mL.L-1 by spraying resulted in higher residual, and in a lower percentage of dissipation in both matrices, with imidacloprid concentrations in the peel exceeding the MRL at 7 and 14 days. In the pulp, none of the treatments exceeded the MRL.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86931143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-22DOI: 10.47280/revfacagron(luz).v40.n1.01
Jorge Vilchez-Perozo
{"title":"Celebrating 55 years of uninterrupted publication","authors":"Jorge Vilchez-Perozo","doi":"10.47280/revfacagron(luz).v40.n1.01","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.01","url":null,"abstract":"","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81662749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-22DOI: 10.47280/revfacagron(luz).v40.n1.03
J. Conde, A. Sánchez-Urdaneta, C. Colmenares, Edison Ramiro, Jorge Ortega-Alcalá
To evaluate the effect of surface and subsurface drip irrigation on the growth and yield of corn, a trial was carried out at the Technical University of Machala-Ecuador, 1,600 m2 of hybrid corn (PIONEER 30K75) were cultivated to apply the treatments: irrigation by surface and subsurface drip at 10, 20 and 30 cm depth. The seed was sown in August 2019 at 80 cm between rows and 40 cm between plants, two seeds per point, with a plant density of 62,500 plants.ha-1. The experimental design was randomized blocks with four treatments and four repetitions. Plant height, fresh and dry biomass of leaves, stalks, and roots, biomass of 100 dry kernels, and yield of dry kernel were evaluated. The highest plant height and biomass of 100 dry kernels was 2.79 m, and 39.08 g, which corresponded to the subsurface drip irrigation treatment at a depth of 30 cm; the highest fresh and dry biomass of leaves, 13,631.3 kg.ha-1 and 3,800 kg.ha-1 respectively, as well as the highest yield of dry kernel 10,337.5 kg.ha-1 was for the subsurface drip irrigation treatment at 20 cm depth. The highest fresh and dry biomass of stalks 32,768.8 kg.ha-1 and 10,381.3 kg.ha-1, and the fresh and dry biomass of roots of 6,381.3 kg.ha-1 and 2,150 kg.ha-1, corresponded to the superficial drip irrigation treatment. With drip irrigation, at 20 and 30 cm depth, higher growth and yield were obtained.
{"title":"Growth and yield of corn under surface and subsurface drip irrigation","authors":"J. Conde, A. Sánchez-Urdaneta, C. Colmenares, Edison Ramiro, Jorge Ortega-Alcalá","doi":"10.47280/revfacagron(luz).v40.n1.03","DOIUrl":"https://doi.org/10.47280/revfacagron(luz).v40.n1.03","url":null,"abstract":"To evaluate the effect of surface and subsurface drip irrigation on the growth and yield of corn, a trial was carried out at the Technical University of Machala-Ecuador, 1,600 m2 of hybrid corn (PIONEER 30K75) were cultivated to apply the treatments: irrigation by surface and subsurface drip at 10, 20 and 30 cm depth. The seed was sown in August 2019 at 80 cm between rows and 40 cm between plants, two seeds per point, with a plant density of 62,500 plants.ha-1. The experimental design was randomized blocks with four treatments and four repetitions. Plant height, fresh and dry biomass of leaves, stalks, and roots, biomass of 100 dry kernels, and yield of dry kernel were evaluated. The highest plant height and biomass of 100 dry kernels was 2.79 m, and 39.08 g, which corresponded to the subsurface drip irrigation treatment at a depth of 30 cm; the highest fresh and dry biomass of leaves, 13,631.3 kg.ha-1 and 3,800 kg.ha-1 respectively, as well as the highest yield of dry kernel 10,337.5 kg.ha-1 was for the subsurface drip irrigation treatment at 20 cm depth. The highest fresh and dry biomass of stalks 32,768.8 kg.ha-1 and 10,381.3 kg.ha-1, and the fresh and dry biomass of roots of 6,381.3 kg.ha-1 and 2,150 kg.ha-1, corresponded to the superficial drip irrigation treatment. With drip irrigation, at 20 and 30 cm depth, higher growth and yield were obtained.","PeriodicalId":54470,"journal":{"name":"Revista De La Facultad De Agronomia De La Universidad Del Zulia","volume":null,"pages":null},"PeriodicalIF":0.2,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81893737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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