摘要
5年试验结果表明,农产品中N经由饲养-堆腐环的损失率平均为36％,P为25％。在丰产条件下,一农业系统80％收获产品经由饲养-堆腐环可循环回田的养分量约为80kgN/ha,14kgP/ha,相当于这一系统中每年化肥N用量的一半和化肥P用量的全部。有机肥料中N和P的表观利用率随施肥年限延长而有增长趋势,表明有残效迭加效应存在。5年平均,有机肥料中N和P的当季表观利用率分别约为40％和43％。
A five years experimental results indicate that thee average loss rate of N contained in harvested products through a feeding-composting cycle is about 36％ and that of P is about 25%. Under high-yield conditions, the amounts of recycled N and P from 80% of harvested products and through a feeding-composting cycle in a farming system are about 80kg N/ha and 14kg P/ha respectively, equivalent to half of N and full of P from fertilizers applied every year to the system.
出处
《应用生态学报》
CAS
CSCD
1992年第3期236-239,共4页
Chinese Journal of Applied Ecology
基金
国家"七五"科技攻关项目<旱农>研究子课题
关键词
农业系统
磷
氮
磷循环
磷肥残效
Phosphorus cycle, Farming system, Feeding-composting system, Recovery of P in organic manure.
