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Mapping the Available Water Capacity in tropical climate soils for soybean (Glycine max) cultivation in the state of Tocantins-Brazil. (English)
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- Author(s): de Moura Andrade, André; da Silva Andrade, Rui; Collicchio, Erich
- Source:
Revista Ambiente e Água; 2021, Vol. 16 Issue 5, p1-12, 12p- Subject Terms:
- Source:
- Additional Information
- Alternate Title: Espacialização da capacidade de água disponível em solos tropicais om cultura soja (Glycine max) no Estado do Tocantins-Brasil. (Portuguese)
- Subject Terms:
- Abstract: Brazilian soybean has undergone considerable economic growth. Its production depends on the demand for some inputs. One of these inputs is the soil water supply, which can be made artificially or obtained by natural rainfall. Knowledge of available water capacity (AWC), which depends on total water availability (TWA), is poorly accessible and difficult to measure in the field. This study aimed to map the AWC of the state of Tocantins, based on pedotransfer functions (PTFs), to evaluate the water availability of the soils of the microregions of that state. We used the Arya and Paris model, aided by a computer program, Qualisolo, made by Embrapa Instrumentação. One hundred fifty-seven tropical soil samples were extracted from the Embrapa Solos portal. Preliminarily, the soil water retention curve (SWRC) was obtained and, subsequently, the TWA and AWC for this oilseed were estimated. Multiple linear regressions show the correlation between TWA and clay (CL), Silt (ST) and total sand (TS) contents. The correlation established was TWA = 3.2993 - 0.0028TS - 0.0034CL. This main conclusion reflects a fruitful AWC for decision-making by the soybean agribusiness and exposes the regional weaknesses for this crop under a rainfed regime in some regions of Tocantins. We could observe that, in terms of water availability, agribusiness is a potential threat to the environment protection area (APA) of the Ilha do Bananal/Cantão, Formoso River microregion. [ABSTRACT FROM AUTHOR]
- Abstract: A soja brasileira tem crescido consideravelmente em termos econômicos. Sua produção depende da demanda de alguns insumos. Um desses insumos é o suprimento de água pelo solo, que pode ser feito artificialmente ou obtido pela pluviometria natural. O conhecimento da capacidade de água disponível (CAD), que depende da disponibilidade total de água (DTA), é pouco acessível e de difícil medição e aferição no campo. Esse trabalho teve o objetivo de mapear a CAD do Estado do Tocantins, a partir de funções de pedotransferência (FTPs), para fins de se avaliar a disponibilidade hídrica dos solos das microrregiões desse estado. O modelo utilizado foi o de Arya & Paris com auxílio de um programa de computador, Qualisolo, confeccionado pela EMBRAPA Instrumentação. 157 amostras de solos tropicais foram extraídas do portal da EMBRAPA Solos. Preliminarmente, obteve-se a curva característica de retenção de água (CRA) e, ulteriormente, estimou-se a DTA e a CAD para essa oleaginosa. Por regressões lineares múltiplas fez-se a correlação entre a DTA e os teores de argila (Ag), Silte (Si), areia total (AT) e carbono orgânico (CO). A correlação selecionada devido à sua simplicidade foi DTA = 3,2993 - 0,0028AT - 0,0034Ag. Esta principal conclusão reflete uma CAD profícua para tomadas de decisão por parte da agroindústria da soja e expõe as fragilidades regionais para esta cultura sob regime de sequeiro em algumas regiões tocantinenses. Observouse uma possível ameaça do agronegócio a APA da Ilha do Bananal/Cantão, microrregião do Rio Formoso, que aparece em termos de disponibilidade hídrica. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Revista Ambiente e Água is the property of Revista Ambiente e Agua and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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