河北省黑龙江地区旱地小麦生产限制因子分析

本文研究了1989-1993年不同降水年型(干旱、正常、湿润)条件下灌水和施肥对黑龙港地区旱作小麦产量的影响，结果表明，在正常和湿润年份，土壤贫瘠是限制产量的主要因子，施肥可以大幅度提高产量。但在干旱年份，土壤水分缺乏制约产量的增加，一次灌水可使产量翻一番，在灌一次水的基础上，每公顷施入100公斤氮和70公斤磷，产量则可以再翻一番。可见，增加肥料投入是旱作小麦产量提高的重要手段之一。

Limitation Factors to the Yield of Winter Wheat Growing on Non-irrigated Land in Heilonggang Area

The effects of irrigation and fertilizer on the yield of winter wheat growing on non-irrigated land in Heilonggang region with different pattern of annual rainfall from 1989 to 1993 were conducted.The results show that fertilizer is very important to the yield of winter wheat and poor soil is the main Limiting factor in normal and wet years.In dry years shortage of water is the main limitation factor,applied one time irrigation the yield could be doubled.On basis of one time irrigation,100kg/ha for N and 70 kg/ha for P₂O₅ dressing could also double the yield.Then increasing fertilizer is an important mean to improve non-irrigated winter wheat yield in this area.