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油菜的耐湿能力比大小麦强,需水量也较多。因此,俗有“烂冬油莱,旱冬麦”,“若要油,二月沟水流”的农谚。然而,我国长江下游冬油莱产区,地处平原水网地区,地下水位高,油菜生育期内降水量多,常出现烂冬或烂春或既烂冬又烂春,使油菜大幅度减产。如1972—1973年度油菜生育期间杭州的降水量为1,104毫米,比上一年620毫米,增加484毫米;浙江省的油菜产量从1972年的亩产143斤的高产年,下降到1973年的95斤,减产33.6%。杭州市郊的油菜产量也从上年的150斤下降到94斤,减产37.3%。1974—1975年度是个烂冬年,全生育期降水量为870毫米,其中冬前(10月—12月)为354毫米,分别比上一年同期560毫米和125毫米,增加310毫米和229毫
Rape than the size of wheat’s ability to resist moisture, water requirements are more. Therefore, the vulgar “rotten winter oil Lai, dry winter wheat,” “to oil, February ditch water flow” farming proverb. However, the winter oil production area of the lower reaches of the Yangtze River in China is located in the plain water network. The groundwater level is high. During the growth period of rape, there is a lot of precipitation, often rotten or rotten or rotten and rotten in winter, . For example, during the 1972-1973 rape growth period, the precipitation in Hangzhou was 1,104 mm, an increase of 484 mm from 620 mm in the previous year. The yield of rapeseed in Zhejiang Province dropped from a high yield of 143 kg per mu in 1972 to 95 in 1973 Kg, a decrease of 33.6%. Hangzhou suburbs of rapeseed production from the previous year’s 150 pounds down to 94 pounds, a decrease of 37.3%. The year 1974-1975 was a rotten winter with a rainfall of 870 millimeters during the whole growth period, of which 354 millimeters were winter before (October-December), an increase of 310 millimeters and 229 millimeters over the same period of the previous year of 560 millimeters and 125 millimeters respectively