Estimation of Reference Crop Evapotranspiration in Wheat Season Based on Forecast Temperature and HS Formula
In order to accurately evaluate the feasibility and accuracy of calculating reference crop evapotranspiration(ET0)based on predicted temperature and Hargreaves samani(HS)formula,the parameters of HS formula were corrected by using the historical meteorological data of Xinxiang from 1961 to 2017 and the results of Penman Monteith(PM)formula.The reference crop evapotranspiration in the growing season of winter wheat from 2018 to 2020 was calculated by using the predicted temperature data and the modified HS formula.Comparing the reference crop evapotranspiration calculated by penman Monteith,the results showed that the estimated daily reference crop evapotranspiration by Hargreaves samani(HS)formula was highly correlated with the reference crop evapotranspiration calculated by penman Monteith.The average absolute error was 0.48 mm/d,the root mean square error was 0.64 mm/d,coefficient of determination was 0.84 and the fitting degree was 0.96.Therefore,it was feasible to use Hargreaves samani(HS)formula to estimate reference evapotranspiration with daily forecast temperature data in Huanghuaihai area,which provided a theoretical and methodological guarantee for agricultural irrigation prediction,and had reference significance for guiding the allocation of local agricultural water resources.
daily meteorological datareference crop evapotranspirationforecast temperatureHargreaves-Samani formula
万方数据
维普
