深层施肥是我国具有悠久历史的一项追肥技术.近十多年来,国内外都有新的发展,已成为很多国家提高农作物产量的技术措施之一. 广东省南海县平洲公社已在三万二千亩晚稻田推广应用,取得大面积增产百分之十至十五的效果.北京市大兴县红星公社东芦大队和上海市郊区两个点,小面积试验分别取得增产百分之十九点四和百分之二十 Deep fertilization is a top dressing technology with a long history in our country.Over the past decade or so, there have been new developments both at home and abroad and it has become one of the technical measures to increase crop yields in many countries. Twelve thousand acres of late paddy fields to promote the use of large areas to achieve a yield increase of 10 to 15 results.Daxing County, Beijing Red Star East Ludong Brigade and the Shanghai suburbs at two points, a small area test were 10% yield increase 9.4% and 20%