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中文摘要：
用中子水分仪于2003年对新疆阿瓦提县丰收三场膜下滴灌条件下不同水肥处理棉田的土壤含水率进行了测定,根据水量平衡原理计算了不同水肥处理的棉花蒸散量,综合考虑影响棉田蒸散的热量条件、土壤水分状况和棉花本身的生物学特性,选用蒸发力、相对土壤有效含水率和播种后天数三因素建立了缺水条件下膜下滴灌棉花蒸散量的计算模型。模型的模拟值与实测值吻合较好,经F检验具有极显著性水平。该模型仅需常规气象资料,计算简便,具有一定的应用价值。
英文摘要：
Using neutron proble,the soil moisture content was monitored in film-mulched and drip irrigated cotton field of Fengshou Third Farm of Awati County,Xinjiang from April to October 2003.The cotton evapotranspiration was calculated based on the principle of water balance.Comprehensively considering the heat condition,soil moisture state and crop＇s biological property,we established a mathematical model for the computation of evapotranspiration of film-mulched and drip irrigated cotton field under water stress.This model involves three parameters,namely,the evaporation potential,relative available soil water content,and days after sowing.The calculation results are in agreement with measured values,and the F test reaches an extreme significance level.The mode1 is convenient in calculation and using routine meteorological data only.It is of certain value in utilization.
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