麦-稻两熟集约生产土壤养分平衡与调控研究

Soil nutrient balance and adjustment under intensive wheat-rice double cropping

以兴化市钓鱼乡为例 ,研究了麦 -稻两熟集约生产的土壤有机质、养分的动态平衡以及调控途径。结果表明 ,在不同的管理模式下 ,高产农田有机物归还量比一般产量条件下高 1 4 .2 2 %～ 1 8.69% ,氮、磷盈余量、钾亏缺量分别为 3 80 .0～4 3 2 kg/hm2、1 9.1 5～ 3 2 .78kg/hm2、99.1～ 1 74 .0 kg/hm2 ,与一般产量条件下比较 ,氮、磷盈余量提高 ,而钾的亏缺量相近。提出了改善高产农田土壤肥力的主要措施。

Balance and adjustment of soil organic matter and nutrients under intensive wheat rice double cropping were studied in Lixiahe region of Jiangsu Province.The results showed that the amount of returned organic material in high yielding fields is 14.22%～18.69% higher than that in normal yielding fields.N and P surpluses and K deficits in the soils under high yielding were 380.0～432.0 kg/hm 2,19.15～32.78 kg/hm 2 and 99.1～174.0 kg/hm 2,respectively,N and P surplus being higher than and K deficit being about the same as those under medium yielding.Some key measures to improve soil fertility under intensive cropping conditions were suggested.