磷是作物进行正常生长必需的一种营养要素。各种作物因土壤磷素供应不足而产量不高,合理施用磷肥而大幅度增产的事实已屡见不鲜。但是要正确地解决磷肥施用中的问题,使其在京郊农业中充分发挥增产作用,还有许多工作要做。一、土壤磷的供应不足已成为当前京郊农作物产量进一步提高的主要限制因素之一 Phosphorus is a nutrient essential for the normal growth of crops. It is not uncommon for crops of all kinds to produce large amounts of phosphorus due to insufficient supply of soil phosphorus and to increase production rationally. However, it is necessary to correctly solve the problems in the application of phosphate fertilizer so that it can give full play to the stimulation effect in the agriculture in the suburbs of Beijing. There is still much work to be done. First, insufficient supply of soil phosphorus has become one of the major limiting factors for the further increase of crop production in the suburbs of Beijing