四川盆地遂宁组(J_(35))母质发育紫色土的平衡施肥与水土保持

Balanced fertilization and soil and water conservation in the purple soil developed from J_(35) material

通过 1996～ 1998年的试验观测得出 ,在川中紫色丘陵区 ,最主要的肥料限制因子是N ,其次是P ,而钾在此地区也有一定的增产效果。但过量施用P、K肥 (P2 O52 0 2kg/hm2 、K2 O175kg/hm2 )反而造成减产。同时 ,由于平衡施肥能促进作物生长 ,增加作物覆盖度 ,减少地表径流和泥沙流失。作物产量越高 ,地表径流和土壤侵蚀就分别少 6 2 4 %和 73 2 % ,养分流失也随之减少 。

The result of trial of 1996 1998 indicated that the key factor controlling crop yield was N,followed by P in the purple hill area in Sichuan, while crop yield can also be increased by applying K in this area. But crop yield was decreased by applying P 2O 5202 kg/ha and K 2O 175kg/ha. Meanwhile, balanced fertilization accelerated the crop growth and improved crop cover, resulting in less runoff and soil loss. Therefore, balanced fertilization resulted with higher yield, 62 4% less runoff and 73 2% less soil loss, less nutrient loss and better environment.