Pub Date : 2022-01-01DOI: 10.36783/18069657rbcs20220022
Osmar Henrique de Castro Pias, Cristian Andrei Welter, T. Tiecher, M. Cherubin, J. Flores, L. Alves, C. Bayer
: Although numerous studies have been conducted with common bean regarding nitrogen (N) dose, time of application, and source in no-till (NT) soils in Brazil, the heterogeneity of the results makes it difficult to establish technical recommendations based on individualized studies. This meta-analysis aimed to rank the main factors influencing common bean response to N management in NT areas. The database consisted of 99 scientific papers that encompassed 160 trials and 2394 observations. In general, the probability of obtaining a positive response to N application in common bean productivity was 77 %, with an average 18 % increment (358 kg ha -1 ). The main factors that affect the response of common bean grain yield to N fertilization and the choice of the applied N dose are soil organic matter (OM) content and the preceding crop. In soils with OM content >20 g kg -1 , the N dose that determines the highest economic return is 50 kg ha -1 . For soils with OM content <20 g kg -1 , the N dose to be applied is 70 and 100 kg ha -1 for crops preceded by legumes and grasses, respectively. The timing of the N application did not result in a significant difference in common bean yield in 62 % of the trials. However, the results showed that the average yield increase in the common bean went from 15 % (293 kg ha -1 ) with a single application to 32 % (622 kg ha -1 ) with split N applications. All N sources tested showed similar gains to those obtained with N application through urea. Excluding situations with high doses of N application (>100 kg ha -1 ), inoculating common bean seeds increased grain yields by 6 % on average (118 kg ha -1 ). The combined analysis of the available results demonstrated that the crop recommendations used in Brazilian soils under NT could be refined considering the soil OM concentration and preceding crop. Additionally, seed inoculation and N dose splitting in the form of common urea should be recommended.
虽然在巴西免耕(NT)土壤中对普通豆进行了大量关于氮(N)剂量、施用时间和来源的研究，但结果的异质性使得难以根据个性化研究建立技术建议。本荟萃分析旨在对影响北部地区普通豆类对氮素管理反应的主要因素进行排名。该数据库包括99篇科学论文，其中包含160项试验和2394项观察结果。一般而言，施氮对普通豆生产力的正响应概率为77%，平均增产18% (358 kg ha -1)。土壤有机质含量和前茬作物是影响普通豆粒产量对施氮和施氮量选择的主要因素。在OM含量为20 g kg -1的土壤中，决定最高经济效益的施氮量为50 kg ha -1。在OM含量为100 kg ha -1的土壤中，接种普通豆种子平均使籽粒产量增加6% (118 kg ha -1)。对现有结果的综合分析表明，考虑到土壤OM浓度和前代作物，在NT下巴西土壤中使用的作物建议可以加以改进。另外，建议采用种子接种和普通尿素分氮方式。
{"title":"Common bean yield responses to nitrogen fertilization in Brazilian no-till soils: A meta-analysis","authors":"Osmar Henrique de Castro Pias, Cristian Andrei Welter, T. Tiecher, M. Cherubin, J. Flores, L. Alves, C. Bayer","doi":"10.36783/18069657rbcs20220022","DOIUrl":"https://doi.org/10.36783/18069657rbcs20220022","url":null,"abstract":": Although numerous studies have been conducted with common bean regarding nitrogen (N) dose, time of application, and source in no-till (NT) soils in Brazil, the heterogeneity of the results makes it difficult to establish technical recommendations based on individualized studies. This meta-analysis aimed to rank the main factors influencing common bean response to N management in NT areas. The database consisted of 99 scientific papers that encompassed 160 trials and 2394 observations. In general, the probability of obtaining a positive response to N application in common bean productivity was 77 %, with an average 18 % increment (358 kg ha -1 ). The main factors that affect the response of common bean grain yield to N fertilization and the choice of the applied N dose are soil organic matter (OM) content and the preceding crop. In soils with OM content >20 g kg -1 , the N dose that determines the highest economic return is 50 kg ha -1 . For soils with OM content <20 g kg -1 , the N dose to be applied is 70 and 100 kg ha -1 for crops preceded by legumes and grasses, respectively. The timing of the N application did not result in a significant difference in common bean yield in 62 % of the trials. However, the results showed that the average yield increase in the common bean went from 15 % (293 kg ha -1 ) with a single application to 32 % (622 kg ha -1 ) with split N applications. All N sources tested showed similar gains to those obtained with N application through urea. Excluding situations with high doses of N application (>100 kg ha -1 ), inoculating common bean seeds increased grain yields by 6 % on average (118 kg ha -1 ). The combined analysis of the available results demonstrated that the crop recommendations used in Brazilian soils under NT could be refined considering the soil OM concentration and preceding crop. Additionally, seed inoculation and N dose splitting in the form of common urea should be recommended.","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69744832","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 : 2022-01-01DOI: 10.36783/18069657rbcs20220035
T. Melo, M. G. Pereira, G. D. Shimizu, G. M. Barbosa, João Tavares
: Heavy clayey Ferralsols are known for their high capacity to form water-stable macroaggregates. However, little is known about how different size classes of macroaggregates exchange mass with increasing organic matter content. This study aimed to characterize and detail aggregation dynamics with increasing organic matter content in these soils. Profiles of three heavy clayey Ferralsols were sampled to isolate the role of organic matter on the stability of aggregates. In this sampling scenario, a conceptual model was established to calculate the aggregation rate of different size classes of water-stable aggregates. This approach allowed the establishment of a critical value for classifying microaggregates in the studied soils (≤0.50 mm) based on their behavior as “building blocks” for macroaggregates when organic matter content is increased. In surface soil layers, where organic matter is higher, most dynamics are expected to happen between macroaggregates classes because free microaggregates are scarce. Consequently, it is important to subdivide macroaggregates into different size classes when evaluating their stability. Quantifying macroaggregates as a single class (e.g., >0.25 or >0.50 mm) was insufficient in representing the macroaggregation dynamics in heavy clayey Ferralsols.
{"title":"Aggregation rate as a function of soil organic matter in heavy clayey Ferralsols","authors":"T. Melo, M. G. Pereira, G. D. Shimizu, G. M. Barbosa, João Tavares","doi":"10.36783/18069657rbcs20220035","DOIUrl":"https://doi.org/10.36783/18069657rbcs20220035","url":null,"abstract":": Heavy clayey Ferralsols are known for their high capacity to form water-stable macroaggregates. However, little is known about how different size classes of macroaggregates exchange mass with increasing organic matter content. This study aimed to characterize and detail aggregation dynamics with increasing organic matter content in these soils. Profiles of three heavy clayey Ferralsols were sampled to isolate the role of organic matter on the stability of aggregates. In this sampling scenario, a conceptual model was established to calculate the aggregation rate of different size classes of water-stable aggregates. This approach allowed the establishment of a critical value for classifying microaggregates in the studied soils (≤0.50 mm) based on their behavior as “building blocks” for macroaggregates when organic matter content is increased. In surface soil layers, where organic matter is higher, most dynamics are expected to happen between macroaggregates classes because free microaggregates are scarce. Consequently, it is important to subdivide macroaggregates into different size classes when evaluating their stability. Quantifying macroaggregates as a single class (e.g., >0.25 or >0.50 mm) was insufficient in representing the macroaggregation dynamics in heavy clayey Ferralsols.","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69745164","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 : 2022-01-01DOI: 10.36783/18069657rbcs20220028
M. G. Pereira, Rafael Cipriano da Silva, M. Cooper, L. Anjos, Deyvid Diego Carvalho Maranhão, F. Oliveira
: Soil evolves in landscapes in a natural process in which soil properties are gradually transformed. However, the transformation of argic to ferralic horizons in basic rock-derived soils under tropical conditions is poorly understood. Depending on the position of the soil profiles in landscape, evidence of pedogenetic transformation between different horizons might indicate the formation and destruction of aggregates with shiny faces. This study aimed to determine pedogenetic changes in basic rock-derived profiles in a toposequence, because soils derived from mafic rocks are not abundant in the study region (Pinheiral, Rio de Janeiro State, Brazil). Trenches were dug at the summit (P1), upper (P2), middle (P3), and lower (P4) thirds along the toposequence. The morphological, physical, chemical, mineralogical, and micromorphological properties of the profiles were characterized, and a weathering index was calculated from X-ray fluorescence element values. All profiles had chemical and physical properties indicating an advanced degree of weathering resulting from the parent material and tropical climate conditions. In P1 and P4 that were classified as Nitossolos , the most evident pedogenetic processes were ferralitization and nitidization, due to the advanced degree of weathering, accumulation of oxyhydroxides and kaolinite in the horizons, and formation of textural pedofeatures by mechanical-hydric stress and evidence of the illuviation process. Profiles P2 and P3 revealed a ferralitization process and were classified as Latossolos . Absence of shiny macromorphological ped faces in some Bw horizons, and their micromorphological coexistence in Bt and Bw horizons within the same profile were associated with the transformation of the blocky into a granular microstructure, suggesting argic-ferralic horizon transformation.
:土壤在景观中的演变是土壤性质逐渐改变的自然过程。然而，在热带条件下，基性岩源性土壤中的湿质层向铁质层的转变尚不清楚。根据土壤剖面在景观中的位置，不同层位之间的成土作用转化的证据可能表明具有闪亮面的团聚体的形成和破坏。这项研究旨在确定地形序列中基性岩石衍生剖面的成土变化，因为研究区域中基性岩石衍生的土壤并不丰富(Pinheiral，里约热内卢de Janeiro State，巴西)。沿拓扑层序在顶部(P1)、上部(P2)、中部(P3)和下部(P4)三分之一处挖沟。对剖面的形态、物理、化学、矿物学和微形态特征进行了表征，并根据x射线荧光元素值计算了风化指数。所有剖面的化学和物理性质都表明，由于母质和热带气候条件的影响，风化程度较高。在被划分为Nitossolos的P1和P4中，由于风化程度的提高，层位中氧氢化物和高岭石的堆积，以及机械-水力应力和光照作用的证据形成的构造性土壤特征，最明显的成土过程是铁素体化和氮化作用。图谱P2和P3显示了一个铁化过程，被归类为拉托索洛。在同一剖面内，Bw和Bw部分层位未见有光泽的大形态ped面，而它们的微观形态共存与块状向颗粒状微观结构转变有关，提示泥铁质层位转变。
{"title":"Genesis and transformation of basic rock-derived soils with shiny ped faces under tropical conditions","authors":"M. G. Pereira, Rafael Cipriano da Silva, M. Cooper, L. Anjos, Deyvid Diego Carvalho Maranhão, F. Oliveira","doi":"10.36783/18069657rbcs20220028","DOIUrl":"https://doi.org/10.36783/18069657rbcs20220028","url":null,"abstract":": Soil evolves in landscapes in a natural process in which soil properties are gradually transformed. However, the transformation of argic to ferralic horizons in basic rock-derived soils under tropical conditions is poorly understood. Depending on the position of the soil profiles in landscape, evidence of pedogenetic transformation between different horizons might indicate the formation and destruction of aggregates with shiny faces. This study aimed to determine pedogenetic changes in basic rock-derived profiles in a toposequence, because soils derived from mafic rocks are not abundant in the study region (Pinheiral, Rio de Janeiro State, Brazil). Trenches were dug at the summit (P1), upper (P2), middle (P3), and lower (P4) thirds along the toposequence. The morphological, physical, chemical, mineralogical, and micromorphological properties of the profiles were characterized, and a weathering index was calculated from X-ray fluorescence element values. All profiles had chemical and physical properties indicating an advanced degree of weathering resulting from the parent material and tropical climate conditions. In P1 and P4 that were classified as Nitossolos , the most evident pedogenetic processes were ferralitization and nitidization, due to the advanced degree of weathering, accumulation of oxyhydroxides and kaolinite in the horizons, and formation of textural pedofeatures by mechanical-hydric stress and evidence of the illuviation process. Profiles P2 and P3 revealed a ferralitization process and were classified as Latossolos . Absence of shiny macromorphological ped faces in some Bw horizons, and their micromorphological coexistence in Bt and Bw horizons within the same profile were associated with the transformation of the blocky into a granular microstructure, suggesting argic-ferralic horizon transformation.","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69744969","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 : 2022-01-01DOI: 10.36783/18069657rbcs20220077
Jônatas Pedro da Silva, José Ferreira Lustosa, R. Teixeira, Ana Márcia Soares Fernandes Xavier, I. Silva, E. Soares
{"title":"Combined legume and non-legume residues management improve soil organic matter on an Oxisol in Brazil","authors":"Jônatas Pedro da Silva, José Ferreira Lustosa, R. Teixeira, Ana Márcia Soares Fernandes Xavier, I. Silva, E. Soares","doi":"10.36783/18069657rbcs20220077","DOIUrl":"https://doi.org/10.36783/18069657rbcs20220077","url":null,"abstract":"","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69751718","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 : 2022-01-01DOI: 10.29327/siacs2021.403056
Grazielle Schornobai, Vanderson Modolon Duart, Victor Gabriel Finkler, Lucas Polli Glugoski, Dion Cristóvão Orlonski, Eduardo Fávero Caires
{"title":"CALAGEM SUPERFICIAL E ADUBAÇÃO COM FOSFATO MONOAMÔNIO, SEM E COM ENXOFRE ELEMENTAR OU GESSO, PARA A PRODUÇÃO DE TRIGO EM SISTEMA PLANTIO DIRETO","authors":"Grazielle Schornobai, Vanderson Modolon Duart, Victor Gabriel Finkler, Lucas Polli Glugoski, Dion Cristóvão Orlonski, Eduardo Fávero Caires","doi":"10.29327/siacs2021.403056","DOIUrl":"https://doi.org/10.29327/siacs2021.403056","url":null,"abstract":"","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"105 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80691539","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 : 2022-01-01DOI: 10.29327/siacs2021.451719
Andréa Renilda Silva Soares, Adalberto Francisco da Silva Júnior, Luany Emanuella Araújo Marciano, Cáren Beatriz dos Santos Felix da Silva, Jane Clésia Silva dos Santos, Anderson Ricardo Galdino da Silva
{"title":"ANÁLISE QUÍMICA DE SOLO CLASSIFICADO COMO LATOSSOLO VERMELHO- AMARELO NO MUNICÍPIO DE MERCÊS-MG","authors":"Andréa Renilda Silva Soares, Adalberto Francisco da Silva Júnior, Luany Emanuella Araújo Marciano, Cáren Beatriz dos Santos Felix da Silva, Jane Clésia Silva dos Santos, Anderson Ricardo Galdino da Silva","doi":"10.29327/siacs2021.451719","DOIUrl":"https://doi.org/10.29327/siacs2021.451719","url":null,"abstract":"","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"132 21 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86472976","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 : 2022-01-01DOI: 10.29327/siacs2021.424211
Vitoria gleyce Sousa ferreira, M. Fushimi
{"title":"CARACTERIZAÇÃO DE UM PERFIL DE SOLO DE SAMBAQUI EM PANAQUATIRA, MUNICÍPIO DE SÃO JOSÉ DE RIBAMAR (MA)","authors":"Vitoria gleyce Sousa ferreira, M. Fushimi","doi":"10.29327/siacs2021.424211","DOIUrl":"https://doi.org/10.29327/siacs2021.424211","url":null,"abstract":"","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"143 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85278145","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 : 2022-01-01DOI: 10.29327/siacs2021.406615
Antonio Rony da Silva Pereira Rodrigues
{"title":"BIORREMEDIAÇÃO DE SOLOS CONTAMINADOS POR PESTICIDAS – UMA REVISÃO INTEGRATIVA DE LITERATURA","authors":"Antonio Rony da Silva Pereira Rodrigues","doi":"10.29327/siacs2021.406615","DOIUrl":"https://doi.org/10.29327/siacs2021.406615","url":null,"abstract":"","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"8 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81818249","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 : 2022-01-01DOI: 10.29327/siacs2021.403198
Niriele Bruno Rodrigues, Tancio GUTIER AILAN COSTA, Erica Souto Abreu Lima, Nelson Moura Brasil do Amaral Sobrinho
{"title":"USO DOS ÍNDICES DE VEGETAÇÃO NDVI E SAVI PARA MONITORAMENTO DA COBERTURA VEGETAL DAS REGIÕES NORTE E NOROESTE FLUMINENSE (RJ)","authors":"Niriele Bruno Rodrigues, Tancio GUTIER AILAN COSTA, Erica Souto Abreu Lima, Nelson Moura Brasil do Amaral Sobrinho","doi":"10.29327/siacs2021.403198","DOIUrl":"https://doi.org/10.29327/siacs2021.403198","url":null,"abstract":"","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"45 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82230938","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 : 2022-01-01DOI: 10.36783/18069657rbcs20210088
Andressa Rosas de Menezes, Ademir Fontana, L. Anjos, M. G. Pereira, J. Schiavo
Soils in the Brazilian Pantanal classified as Espodossolos and registered in the literature diverge from the central concept of pedogenesis by podzolization, especially due to the high values of pH and basic cations, although the morphology is similar to that of spodic horizons. In this sense, this study hypothesized that the neutral to alkaline conditions along the edges of the saline basins in the Lower Nhecolândia region do not inhibit the podzolization process nor the development of spodic soils. The objectives were to analyze the attributes of soils with spodic features and evaluate whether they correspond to a podzolization process. Four profiles in a transect in Lower Nhecolândia were selected, where the morphology indicated the presence of a spodic horizon. Three profiles (P1, P2 and P4) were located in a bay and one in the transition between a bay and a “cordilheira” (small elevation between lagoons) (P3). The soils were analyzed for particle size, chemistry and X-ray fluorescence (XRF), as well as organic carbon (C org), total carbon (TC) and XRF of the nodules. The complexity of features and characteristics of soil profiles in the Lower Nhecolândia region indicate multiple pedogenetic processes in this environment. The characteristics of all profiles denote a redoximorphic process: poor profile development (except for P3), mottles formed by precipitation of Fe and Mn oxides, as well as presence of Fe and Mn nodules. The organic matter content of these nodules is mostly greater than or equal to that of the surrounding material, and aluminum is relatively not higher than in the fine earth. This reinforces a rexodimorphic process in the horizons with spodic features. The occurrence of sodic and solodic characters, as well as clay accumulation in P3 also characterize the sodification process. The neutral to alkaline pH values in water, high sum of bases and low C org and Al oxide contents of the studied soils all contradict the occurrence of a podzolization process. However, Fe, Al and C org accumulation in the nodules and some B horizons indicate a spodic character. Also, the fact that SiBCS criteria classify the studied soils as Espodossolos indicates the relevance of establishing limits for chemical attributes, which would adjust the taxonomy of soils with a spodic character according to their pedogenesis.
{"title":"Soils with dark subsurface horizons in saline basins in the Brazilian Pantanal","authors":"Andressa Rosas de Menezes, Ademir Fontana, L. Anjos, M. G. Pereira, J. Schiavo","doi":"10.36783/18069657rbcs20210088","DOIUrl":"https://doi.org/10.36783/18069657rbcs20210088","url":null,"abstract":"Soils in the Brazilian Pantanal classified as Espodossolos and registered in the literature diverge from the central concept of pedogenesis by podzolization, especially due to the high values of pH and basic cations, although the morphology is similar to that of spodic horizons. In this sense, this study hypothesized that the neutral to alkaline conditions along the edges of the saline basins in the Lower Nhecolândia region do not inhibit the podzolization process nor the development of spodic soils. The objectives were to analyze the attributes of soils with spodic features and evaluate whether they correspond to a podzolization process. Four profiles in a transect in Lower Nhecolândia were selected, where the morphology indicated the presence of a spodic horizon. Three profiles (P1, P2 and P4) were located in a bay and one in the transition between a bay and a “cordilheira” (small elevation between lagoons) (P3). The soils were analyzed for particle size, chemistry and X-ray fluorescence (XRF), as well as organic carbon (C org), total carbon (TC) and XRF of the nodules. The complexity of features and characteristics of soil profiles in the Lower Nhecolândia region indicate multiple pedogenetic processes in this environment. The characteristics of all profiles denote a redoximorphic process: poor profile development (except for P3), mottles formed by precipitation of Fe and Mn oxides, as well as presence of Fe and Mn nodules. The organic matter content of these nodules is mostly greater than or equal to that of the surrounding material, and aluminum is relatively not higher than in the fine earth. This reinforces a rexodimorphic process in the horizons with spodic features. The occurrence of sodic and solodic characters, as well as clay accumulation in P3 also characterize the sodification process. The neutral to alkaline pH values in water, high sum of bases and low C org and Al oxide contents of the studied soils all contradict the occurrence of a podzolization process. However, Fe, Al and C org accumulation in the nodules and some B horizons indicate a spodic character. Also, the fact that SiBCS criteria classify the studied soils as Espodossolos indicates the relevance of establishing limits for chemical attributes, which would adjust the taxonomy of soils with a spodic character according to their pedogenesis.","PeriodicalId":21215,"journal":{"name":"Revista Brasileira De Ciencia Do Solo","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69741970","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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