黄花苜蓿和紫云英等绿肥,是我县水稻的主要肥料,对这些绿肥作物增施磷肥,常能显著增加鲜草产量。过去群众习惯用骨粉、坑岩、坑沙等含磷较多的肥料当基肥,近年来由于绿肥面积的扩大,这些磷肥来源有限,产生了供不应求的局面,因此,从1957年在本县开始试用过磷酸钙来代替骨粉等磷肥,由于效 Medicago sativa and milk vetch and other green manure, is the main fertilizer for rice in our county, these green manure crops increased phosphate fertilizer, often can significantly increase the yield of fresh grass. In the past, people used to use more fertilizers, such as bone meal, pit rock and pit sand, as basic fertilizers. In recent years, due to the expansion of green manures, limited sources of these fertilizers have created a situation of short supply. Therefore, starting from 1957, Superphosphate instead of bone meal and other phosphate, due to efficiency