上海郊区三麦产量高低与受渍害程度密切相关。渍害主要是由于降雨形成“三水”滞留田间所致。因此,弄清雨水对三麦产量影响程度,加深对水害的认识,就能采取有力措施,根治渍害,进一步促进三麦生产的发展。现就解放以来郊区三麦秋播期、春后3～5月和三麦全生育期雨量多少与产量高低的相关性作如下分析。一、秋播期间雨量与三麦产量的相关性上海郊区秋播适期在10月底至11月中旬。实践证明:三麦高产应具有足够的越冬苗数,这就要求不违农时,适期播种。但这时如遇阴雨,往往带来烂耕烂种,土壤粘韧,“坌坌一条 The output level of three wheat in Shanghai suburbs is closely related to the degree of soil erosion. Waterlogging was mainly due to the formation of precipitation “Sanshui” caused by the field. Therefore, to understand the impact of rainwater on the yield of three wheat and deepen the understanding of water hazards, we can take effective measures to cure the root causes and further promote the development of the three wheat production. Now since the liberation of the suburbs three wheat autumn sowing, spring 3-5 months and three wheat throughout the growth period of the amount of rainfall and yield correlation as follows. First, during autumn sowing the correlation between the amount of rainfall and the three wheat yield Shanghai suburban autumn sowing period in late October to mid-November. Practice has proved that: three high-yielding wheat should have enough number of wintering, which requires non-agricultural, suitable for sowing. But at this time in case of overcast and rainy days, often bring rotten farming rotten soil sticky tough, "坌 坌 a