Study on Significant Meteorological Factors of Evapotranspiration of Jujube Orchard under Drip Irrigation

【Objective】 To study the correlation between evapotranspiration (ET₀) of different reference crops and significant meteorological factors, and the contribution rate of each significant meteorological factor to the actual evapotranspiration (ET_c) of jujube orchard under drip irrigation. 【Methods】 Based on the drip irrigation experiments of jujube trees in Aksu area, penman-Monteith (PM), Hargreaves Samani (HS) and Priestley-Taylo (PT) models were chosen to analyze the significant meteorological factors of different ET₀ and the contribution rate of each significant meteorological factor to ET_c in jujube orchard. 【Results】 Mean relative humidity (RH) was negatively correlated with ET₀, while solar radiation (R_n), zenithal radiation (R_a), maximum temperature (T_max), minimum temperature (T_min), average temperature (T) and wind speed (U) were positively correlated with ET₀. The significant meteorological factors contributed to ET_c of each model were PM-R_n (62.6%), U (19.9%), T (11.8%) and RH (5.7%).HS-T_max (55.1%), T_min (30.1%), R_a (11.6%) and T (3.2%), PT-R_n (84.1%), T (12%), and T_min (3.9%). 【Conclusion】 T_max and R_n contributed the most to ET_c in drip irrigation jujube orchard.