Water balance for determination of excess water in soybean cultivated in lowland soils

The aim of this study was to derive a methodology for calculating a sequential water balance that accurately estimates the occurrence of excess water in soybeans cultivated in lowlands. We tested four calculation strategies of water balance associated with the simulation of soybean development, whic...

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Published inRevista ambiente & água Vol. 16; no. 3; pp. 1 - 12
Main Authors Bortoluzzi, Mateus Possebon, Gubiani, Paulo Ivonir, Heldwein, Arno Bernardo, Trentin, Roberto, da Silva, Jocélia Rosa, Nied, Astor Henrique, Zanon, Alencar Junior
Format Journal Article
LanguageEnglish
Published Taubaté Instituto de Pesquisas Ambientais em Bacias Hidrográficas 01.09.2021
Subjects
Effective precipitation
Estimates
Evapotranspiration
Excess water
Lowlands
Mathematical analysis
Microporosity
Precipitation
Rain
Rainfall
Rice
Runoff
Soil
Soil conservation
Soil layers
Soil moisture
Soil water
Soybeans
Water balance
United States > US
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Summary:The aim of this study was to derive a methodology for calculating a sequential water balance that accurately estimates the occurrence of excess water in soybeans cultivated in lowlands. We tested four calculation strategies of water balance associated with the simulation of soybean development, which differed on the calculation of rainfall and time of water drainage from the soil macropores. Data of volumetric moisture monitored in three soil layers throughout the soybean cycle in the 2014/15 agricultural year were used as a reference. Microporosity was used as a lower limit for the occurrence of excess water in the area. Excess water was considered to be whenever the daily volumetric soil moisture in the 0-100 mm layer was greater than 0.39 mm3 mm-3. Over the 111 days of measurement, soil moisture indicated the presence of excess water in 38 days. The traditional calculation strategy of water balance underestimated the occurrence of excess water, as well as the other strategies that considered effective precipitation in their formulas. The calculation strategy that considers that all the rainfall infiltrates in the soil and that the water from macropores is removed only by crop evapotranspiration exhibited good performance and indicated 35 days of excess water, being the most appropriate and recommended for determining excess water in lowland soybeans.
ISSN:1980-993X
DOI:10.4136/1980-993X