由中国土壤肥料研究会会同河南省土壤学会、河南省农科院土肥所、河南省土肥站主持召开的全国吨粮田地力建设和施肥效益学术讨论会于1991年12月1—6日在郑州召开。参加会议的代表是来自全国各省、市、自治区的高、中级农业科技人员共114名,会议收到论文58篇。与会代表在会上围绕对吨粮田开发建设的认识、经验、研究成果以及存在问题等方面进 By the China Soil and Fertilizer Research Association with the Henan Institute of soil, Henan Academy of Agricultural Sciences, soil and Fertilizer Station, Henan Province, hosted by the National Fertilizer Station tonnage field construction and fertilizer benefit seminars in December 1991 December 1-6 in Zhengzhou Held. The delegates to the conference were 114 high and middle-level agricultural scientists and technicians from all provinces, cities and autonomous regions in China, and 58 papers were received during the conference. Participants at the meeting around the development and construction of tons of grain understanding, experience, research results and problems and so on