01840naa a2200193 a 450000100080000000500110000800800410001910000200006024501550008026000090023552012190024465000260146365000200148965000120150970000210152170000170154270000210155977300660158021370242021-12-02       2021    bl uuuu     u00u1 u    #d1 aALVES, E. da S.  aEvaluation of models to estimate the actual evapotranspiration of soybean crop subjected to different water deficit conditions.h[electronic resource]  c2021  aAbstract: 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 different levels of water available in the soil (AW). The T1 treatment was performed applying 80 to 100% AW; in T2 treatment, the allowed variation was 60 to 80% AW; in T3 treatment, it was 40 to 60% AW; in T4, from 20 to 40% AW; and in T5, from 0 to 20% AW. The results showed that the FAO56 Dual model showed better performance in soybean ETa estimation for winter conditions in most treatments, with NSE ranging from 0.42 to 0.83. In the summer, the Jensen and Hermann model showed the best results, with NSE ranging from 0.70 to 0.94.  aIrrigation management  aWater resources  aCerrado1 aRODRIGUES, L. N.1 aCUNHA, F. F.1 aFARIAS, D. B. S.  tAnais da Academia Brasileira de Ciênciasgv. 93, n. 4, 2021.