论文部分内容阅读
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％。
Based on the results of previous field experiments and meteorological observations, this paper analyzes the characteristics of winter wheat moisture supply and demand in Cangzhou by applying the Penman formula and the potential of climate productivity, and theoretically discusses the irrigation efficiency in different periods. The results showed that the water condition of wheat in winter before winter was basically satisfactory, and the contradiction between water supply and demand after returning to greening became more and more acute. The water deficit in each stage of returning to greening and maturity was 88-138mm and the yield was reduced by 18 -50%. The effect of irrigation on yield increase was the best in jointing-heading stage, and the yield increase was 40.6% and 18.3% higher than that of returning-jointing-jointing and heading-maturing irrigation respectively under the same amount of irrigation.