“肥水”也叫“油水”,是我国广大贫下中农在长期斗争中发现和利用的一种宝贵地下肥源。这种水里含有一种和氮素化肥作用相似的硝酸态氮素。群众把这种水叫做“肥水”,有“肥水”的井就叫做“肥水井”。利用“肥水”灌溉已引起全国各地普遍重视。陕、豫、鲁等省对“肥水”已开发利用,并且取得很好的增产效果,其他省市也在普查、化 “Fertile water” is also called “oil and water” and is a precious underground fertilizer source discovered and used by the vast number of poor and middle peasants in the long struggle in our country. This water contains a nitrate nitrogen similar to that of nitrogen fertilizers. The masses call this kind of water “fertilizer water,” and wells called “fertilizer water” are called “fertilizer water wells.” The use of “fertilizer and water” irrigation has attracted widespread attention throughout the country. Shaanxi, Henan and Shandong provinces have developed and utilized “fertilizer and water” and have achieved good stimulation effects. Other provinces and cities are also conducting census and chemical