麦-稻两熟超高产的土壤养分平衡与调控研究

STUDIES ON SOIL NUTRIENT BALANCE AND ADJUSTMENT UNDER WHEAT RICE DOUBLE CROPPING WITH SUPER HIGH YIELDS

以兴化市钓鱼乡为例，研究了麦－稻两熟超高产的土壤有机质、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，超高产农田有机物归还量比高产条件下高１４．２２％～１８．６９％。超高产条件下氮、磷盈余量、钾亏缺量分别为３８０．０～４３２ｋｇ／ｈｍ２、１９．１５～３２．７８ｋｇ／ｈｍ２、９９．１～１７４．０ｋｇ／ｈｍ２，与高产条件下比较氮、磷盈余量提高，而钾的亏缺量相近。提出了改善超高产农田土壤肥力的主要措施。

Balance and adjustment of soil organic matter and nutrients under wheat rice double cropping with super high yields were studied in Lixiahe region of Jiangsu province. The results showed that under different management models N and P surpluses and K deficits for the soils under super high yielding were 380 0～432 0 kg/hm 2, 19 15～32 78 kg/hm 2 and 99 1～174 0kg/hm 2, respectively N and P surplus being higher than and K defict being about the same as those under high yielding. The some key measures to improve soil fertility under super high yielding were put forward.