Comparison of Methods for Estimating Crop Water Use: Sap Flow, FAO-56 Penman-Monteith, and Weather Parameters

Knowing crop water uptake each day is useful for developing irrigation scheduling. Many technologies have been used to estimate daily use. Sap flow one of the that measure through stem a plant and uptake. sensor an effective direct method measuring use, but it relatively expensive requires frequent maintenance. Therefore, alternative methods, such as evapotranspiration based on FAO 56 Penman-Monteith equation other weather parameters were evaluated find correlation with sap flow. In this study, Dynamax Flow 32-1K system was utilized monitor potato The results show has strong (RMSE = 1.34, IA 0.89, MBE -0.83), solar radiation 2.25, 0.72, -1.80), not air temperature, relative humidity, wind speed, vapor pressure. It worth noting R2 between humidity 0.55. This study concluded can be methods