随着我国工农业生产的发展,化肥用量和品种不断增加,研究改进化肥的施用技术,提用化肥的利用率,对促进农业生产有很大意义。无产阶级文化大革命以来,三结合的群众性科学实验运动蓬勃开展,农业科技人员与广大贫下中农相结合,积极开展科学实验活动,在化肥试验方面取得很大进展,简述如下: With the development of industrial and agricultural production in our country, the amount and types of fertilizers are continuously increasing. It is of great significance to study the application techniques of fertilizers and the utilization of chemical fertilizers to promote agricultural production. Since the Great Proletarian Cultural Revolution, the three-mass mass scientific experiment campaign has flourished. The agricultural science and technology personnel, in combination with the vast majority of poor and middle-class peasants, have actively carried out scientific experiment activities and made great strides in fertilizer tests. The brief is as follows: