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淮南稻区人多地少,自推行联产责任制以来,豆科绿肥面积骤减,有机肥料比重下降。长此以往,必导致地力减退。为此,在以粮食为主的轮作制度中,如能插种一季豆科作物,无论对增加经济收入,促进作物的良性循环,以及持续平衡增产,都是十分有利的。目前,在后季稻产量较稳的苏州地区,正在试行麦、豆、稻的粮豆轮作制,但在后季稻产量不稳的丘陵、高沙土和里下河地区,这种制度尚难以推广。
Huainan rice paddies and more people, since the implementation of the joint responsibility system, legume green manure area plummeted, the proportion of organic fertilizers decreased. In the long run, it will inevitably lead to a decline in fertility. Therefore, in the food-based rotation system, if the first-season leguminous crops can be planted, it will be very beneficial to increase the economic income, promote the virtuous circle of crops and continue to increase the output balance. At present, the production of grain and bean in wheat, beans and rice is being piloted in Suzhou, where the yield of the latter season is relatively stable. However, in the areas of the hills, high sand and Lixiahe areas where the yield of the latter season is not stable, this system is still difficult Promotion.