在毛主席“农业学大寨”的伟大号召指引下,全国许多地区为了广开肥源促进粮棉不断高产,先后开展了肥水资源的调查和开发利用。1971—1972年我们也在江苏省徐州地区进行了井水氮肥资源的调查工作。这项工作是在徐州地区各级党委的领导下,采用群众性普查方法完成的。为了摸清井水硝态氮的形成和分布规律,还在代表地区进行了重 Guided by the great call by Chairman Mao’s “Agriculture Studies in Dazhai”, many areas across the country have successively conducted investigations, explorations and utilization of fertilizer and water resources in order to promote the continuous high-yielding of grain and cotton in order to expand the source of fertilizer. From 1971 to 1972, we conducted a survey of well water and nitrogen fertilizer resources in Xuzhou, Jiangsu Province. This work was done under the leadership of the CPC committees at all levels in Xuzhou and by mass census methods. In order to find out the formation and distribution of nitrate nitrate in well water, heavy load was also carried out on behalf of the region