基于ETgage法对南疆膜下滴灌棉花灌溉制度优化的研究

Study on Optimization of Irrigation System of Cotton Field under Film Drip Irrigation in Southern Xinjiang Based on ETgage Method

本研究基于模拟蒸散仪ETgage的方法对南疆膜下滴灌棉田实际蒸散量进行测定,进而制定棉花最优节水的灌溉策略。结果表明:棉田ETgage(G2#)模拟蒸散量与ET0变化规律几乎一致,表现为显著线性正相关;灌溉定额和灌水频率的增加能够显著提高棉花的各项生长和生理指标;根据不同处理下收获的棉花产量和品质,基于ETgage的最优灌溉方式为以1.0倍的ETgage(G2#)累积蒸散量作为灌溉定额的处理,灌溉频率采用每隔5天灌溉策略,籽棉产量可达7896.80 kg/hm^2,水分利用效率为1.76 kg/m^3。

In this study,the simulated evapotranspiration instrument(ETgage)was used to measure the actual evapotranspiration of cotton fields under drip irrigation under film in Southern Xinjiang,so as to formulate the optimal water-saving irrigation strategy.The results showed that ETgage(G2#)simulated evapotranspiration in cotton field was almost consistent with ET0,showing significant positive linear correlation.Different irrigation treatments showed that the increase of irrigation quota and frequency could significantly improve the growth and physiological indexes of cotton.According to the yield and quality of cotton harvested under different treatments,the optimal irrigation method based on ETgage is to take the cumulative evapotranspiration of ETgage(G2#),which is 1.0 times as the irrigation quota.The irrigation frequency adopts the irrigation strategy of every 5 days,and the seed cotton yield of cotton can reach 7896.80 kg/hm^2,and the WUE is 1.76 kg/m^3.