论文部分内容阅读
七十年代,太湖地区普遍施行双三制后,由于渍水时间延长与不合理耕作,致使土壤性状变坏。突出表现在耕作层变浅,土壤发僵;犁底层增厚,出现青泥层,通透性变差;土壤养分释放迟缓,氮肥胃口增大,带来了成本上升,收成减少等一系列问题。为了改良不断恶化的土壤性状,“六五”期间,广大科技工作者进行了探讨研究,提出在治水改土、增肥改土、
In the seventies, after the implementation of Shuangsan system in the Taihu Lake area, soil properties deteriorated due to prolonged waterlogging and irrational farming. Outstanding performance in the farming layer shallow, stiff soil; plow thickening, there is green layer, permeability deterioration; slow release of nutrients in the soil, nitrogen appetite increases, bringing the cost increases, reduced harvest and a series of problems . In order to improve the deteriorating soil characteristics, during the “Sixth Five-Year Plan” period, a large number of scientists and technicians conducted research and discussion, put forward that in improving water quality and soil improvement,