Evaluation of models to estimate the actual evapotranspiration of soybean crop subjected to different water deficit conditions

Abstract

Optimization of water use for irrigation will only be possible with the adjustment of management, which is directly related to the correct estimate of the actual evapotranspiration of the crop. The present study aimed to evaluate different mathematical approaches used in estimating the actual evapotranspiration of a new soybean cultivar (BRS 7581RR) subjected to different water defi cit conditions. For this, the ETa estimated by the FAO56 Dual, Jensen and Hermann, AquaCrop and Ritchie models was evaluated. The experimental design was randomized with fi ve treatments and four replicates. Irrigation management in the treatments was conducted so as to maintain

Effects of changes in use and soil cover on real evapotranspiration from the creation of a remote sensing product in the Xingu basin

“…Across all three periods, the conversions of "forest to agricultural area" and "savannah to agricultural area" presented variation curves with very similar behavior, considering that these alterations in the vegetation cover alter the dynamics of the soil, but the hydrological demand of the planted crops, especially soybeans in the Xingu basin, promotes small extreme ET fluctuations, driven by the restriction of water in the soil (Alves, 2021;Lucas et al, 2021).…”

“…It is well-established that changes in land use and land cover have an impact on climate (Alves et al, 2021;Rossatto et al, 2022), biological diversity (Sala et al, 2000;Galina et al, 2022), as well as on hydrological and biogeochemical cycles (Marinho Junior et al, 2020). Numerous studies have shown that deforestation significantly reduces precipitation and ET (Costa and Foley, 2000;Nóbrega, 2014;Santos et al, 2017;Saddique et al, 2020).…”

Caracterização do acúmulo de carbono orgânico no solo em produção de soja (>i<Glycine max>/i< L.) irrigada no MATOPIBA

“…localidades tiveram seus TA maiores do que os tratamentos sem irrigação (tratamento 1). Embora o tratamento 2 (lâmina 45%ETC) tenha sido o único a gerar valores de TA<0 para a localidade 2, os valores de TA2 ainda foram maiores em 57,14% quando comparada ao TA1 (sem irrigação), o que representou uma perda menor de carbono estocado no solo.Tabela 19 -Valores de ETC de 441mm foram observados em ambiente de Cerrado no município de Planaltina (DF) pelos autoresAlves et al (2021b), com ETC diária variando entre 2,10 e 7,10mm.Em relação a eles, São Desidério apresentou redução de 12,92% na ETC, o que foi justificado pela diferença entre os dados climáticos de Planaltina.…”