Soya bean (Glycine max L.) evapotranspiration under unlimited and water stress conditions as affected by weather

Abstract

Soya bean's growing area has increased in Hungary since the 2000s, yet few direct field‐based evapotranspiration measurements are available. Compensation evapotranspirometer was used to control two watering levels (unlimited and water stress limited to flowering) at Hungary (45°N), in a three‐season study (2017–2019). Two soya bean varieties with different water demands, Sinara and Sigalia, were analysed. During these vegetation periods, the total evapotranspiration in unlimited water level (both varieties) was above 600 mm, while water stress during flowering reduced it to about half. Water losses in the wet 2018 were slightly lower than during the dry 2017 and 2019. Correlation coefficient values between evapotranspiration and weather variables implied that water losses were controlled by available energy and relative humidity in dry and wet seasons, respectively. Using easily accessible meteorological variables, the air temperature was found to be the best estimator of evapotranspiration. Due to water stress under flowering, the seasonal mean yields varied irregularly in both varieties. Irrespective to season, the water productivity for grain showed a trend to lower values in unlimited watering compared to water stress conditions. Crop‐water response in both soya bean varieties would offer valuable information for breeders and seed distributors in identifying better varieties under mild continental climate.

Establishment of a crop evapotranspiration calculation model and its validation

“…They concluded that the multisource model based on radiation‐intercepted corn quality is suitable for predicting ET0 and corn seed composition (Jiang et al, 2019; Lacerda et al, 2016; Zhang et al, 2021; Schoo et al, 2016). Anda et al, 2020 used a compensation evapotranspirometer to measure evapotranspiration in the field for two Hungarian soybean varieties with different water requirements, sinala, and western bean (Anda et al, 2020). Tuo et al derived the crop evapotranspiration calculation model based on both the energy balance and aerodynamic equations using the SPAC Data.…”