一、我国有部分土壤缺磷,山东省陵县农业外资办在中国农科院土肥所的指导下,从1990年开始对冬小麦、夏玉米和棉花等农作物进行了节约用磷、经济施磷的多点试验,并将施用方法在全县推广,取得了较高的经济效益。 First, some of China’s phosphorus deficiency in soil, Shandong Province, Lin County Agricultural Foreign Investment Office in the Chinese Academy of Agricultural Sciences under the guidance of soil and fertilizer, from 1990 on the winter wheat, summer corn and cotton and other crops for phosphorus conservation, economic phosphorus Multi-point test, and the application method in the county promotion, achieved higher economic benefits.