膜下滴灌制种玉米需水量与需水规律的研究

Study on Water Requirement and Water Use Efficiency of Mulched- corn for Seed Water with Drip Irrigation

【目的】定位监测高产膜下滴灌制种玉米田间土壤水分动态变化，为膜下滴灌制种玉米拔节后水分管理提供理论依据。【方法】采用时域反射仪（TDR）对膜下滴灌制种玉米田间土壤水分动态变化连续监测并分析干物质的积累情况，运用水分平衡法计算膜下滴灌制种玉米各生育时期耗水量和水分生产率。【结果】拔节期至灌浆期45d左右是玉米耗水高峰期，日平均耗水强度为6．4mm；灌浆期13耗水强度为3．2mm。【结论】制种玉米拔节后根区的土壤体积含水量总是维持在23．5％-31．4％（田间持水量的60％-80％）。

[ Objective ] The purpose of this project aims to provide a theoretical basis for maize jointing water management through the study of located monitoring for dynamic soil water of high yield corn for seed un- der- mulch- drip irrigation. [Method] Time domain refleetometry （TDR） was used to continuously monitor the dynamic soil moisture, accumulation of dry matter was analyzed, and water balance method was applied to calculate water consumption and water productivity under different periods of under - mulch - drip corn for seed. [ Result]Nearly 45 days from jointing to filling was the peak of corn water consumption. The average daily water consumption intensity was 6.4 mm; and 3.2 mm each day during filling stage. [ Conclusion ] Root soil volumetric moisture content was always maintained at 23.5% - 31.4% （ equals to 60% - 80% of field capacity）