沧州地区冬小麦的水分供需特征及水资源的合理利用

本文根据前人的田间试验结果和气象观测资料,应用彭曼公式和气候生产潜力的理论与方法,分析了沧州地区冬小麦水分供需特征,并从理论上探讨了不同时期灌水的生产效率。结果表明:本区小麦冬前水分条件较好,基本上可以满足需要,返青后水分供需矛盾日趋尖锐,返青—成熟各关键期各生育阶段的缺水幅度为88—138mm,产量降低幅度为18—50％。 灌溉的增产作用以拔节—抽穗期最好,在灌溉量相同的情况下,分别比返青—拔节期和抽穗—成熟期灌溉的增产40.6％和18.3％。

Evaluation on the water condition of winter wheat and reasonable use of water resource in Cangzhou region

Based on the results of field experiment and the meteorological data by predecessors, using Penman's formula and the theory and method of potential productivity of climate, the evaluation on the water condition of winter wheat in Cangzhou egion is analysed. The productive efficency of irrigated water in different period is investigated in theory. The results show that the water condition is better beforewin-ter, yet water supply after the reviving is out of proportion to water requirement, . an amount of water deficit is about 88-138mm in each growing period, the yield decreased about 18-50%The effect of irrigating on the increased yield is the best at jointing-earing stage under the same irrigated quantity, the increased yield is more 40.6% and 18.3% than the stages of reviving-jointing and earing-ripening respectively.