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江淮丘陵地区是我省主要水稻产区之一,稻田面积占耕地面积的80%左右.五十年代前后,这个地区部分稻田原实行中稻一休闲(冬沤或冬干晒垡) 的一年一熟种植制度.五十年代中期以来,随着农业生产条件的改善,进行了沤改旱、一熟改两熟、单季稻改双季稻、发展油稻稻等耕作改制,熟制类型发生了较大的变化.目前;这个地区北部和中部稻田;多实行稻麦两熟为主的复种(轮)连作制;南部稻田多实行肥稻稻或油稻稻为主的复种(轮)连作制.由于熟制类型单一,多数是复种连作,导致稻田土壤结构变坏,肥力日趋衰退,影响农作物持续增产.实践证明,实行多种复种方式相配合,建立用养结合、
Jianghuai hilly area is one of the main paddy producing areas in our province, the area of paddy field accounts for about 80% of the cultivated area around the fifties, some paddy fields in the region originally implemented a leisure (winter 沤 or winter 晒 sun 垡) year Since the mid-1950s, with the improvement of agricultural production conditions, there has been a series of tillage and reorganization farming systems ranging from 沤 to drought, one ripening to two ripening, single cropping rice to double-cropping rice and development of rice paddy, At present, the rice fields in the northern and central regions of the region are mostly multi-cropping (round) continuous cropping systems in which rice and wheat are mainly used for two crops, and the multiple cropping (round) cropping system mainly uses paddy or paddy rice in the southern paddy fields. Due to the single type of ripening and the majority of multiple cropping in succession, the soil structure of paddy field is deteriorating and the fertility is deteriorating, affecting the continuous increase of crop yield.It has been proved that the practice of multiple cropping methods,