近几年来,我国北方冬油菜生产发展迅速,据初步统计1980年收获面积约600多万亩,1981年收获面积940.8万亩,较1980年收获面积增加52.7％。无数事例表明,在我国北方利用早春作物的冬闲地播种油菜不仅不影响春播(春播改为夏播)作物的产量,而且能增收一季油菜籽,起到促进耕作改制,培肥地力,以油促粮的作用。 In recent years, the production of winter rapeseed in northern China has been developing rapidly. According to preliminary statistics, about 6 million mu of harvested land was acquired in 1980 and 9,408,000 mu of harvested land in 1981, an increase of 52.7% over the harvested area in 1980. Numerous examples show that sowing rape in the winter fallow fields that use early spring crops in northern China not only does not affect the yield of spring sowing (sowing to sowing in summer), but also rapeseed harvest for the first season can play an important role in promoting tillage and fertility and fertility. The role of food.