根外追磷肥就是普通所说的喷射磷肥(把过磷酸石灰喷在棉花的叶子上)是一种最新的农业技术措施。关于这种措施本来也早已介绍到我国,但是近一二年来苏联关于这方面的研究是更多了。鉴于根外追肥的高度效果,苏联在主要的棉区,在生产上已经大规模的利用了。例如1951年在乌茲別克就有一万公顷的棉田应用了这种措施,而 Phosphate fertilizer outside the root is commonly referred to as the injection of phosphate fertilizer (sprayed with phosphoric acid lime on the leaves of cotton) is a latest agricultural technology measures. This measure has already been introduced to our country, but in the past one or two years the Soviet Union has done more research in this area. In view of the highly effective effect of top-dressing on the outside, the Soviet Union has made extensive use of its production in the major cotton areas. For example, in 1951 there were 10,000 hectares of cotton fields in Uzbekistan that applied this measure