针对在“农业学大寨”群众运动中大搞农田基本建设所提出的生土当年熟化当年高产的生产关键问题,我院在1974年经多点试验初步肯定腐殖酸类肥料(以下简称腐肥)对主要作物具有肥效的基础上,于1975年,通过教学、科研、生产三结合,重点进行了腐肥在生土熟化措施中改土效应的研究。 Aiming at the key issues of producing high-yielding soil that year when the farmland was popularized in the mass movement of “Learning Agriculture in Dazhai”, our institute initially confirmed the humic acid fertilizer (hereinafter referred to as the " Fertilizer) on the main crops with fertilizer on the basis of, in 1975, through the combination of teaching, research, production, focusing on fertilizer in the soil aging measures in soil improvement effect of the study.