靠大量施用化肥,增加粮食产量,结果使土壤有机质含量大大降低,土壤板结,粮食品质变差,生产成本高,增产不增收;若单独施用农家肥,虽然培肥了地力,降低了成本,但粮食产量不高,因此,要想使粮食产量逐年提高,土地越种越“肥”,必需将化肥与农家肥搭配施用。技术要点有三条: By using a large amount of chemical fertilizers to increase grain yields, the soil organic matter content is greatly reduced, soil compaction, grain quality is deteriorated, production costs are high, and yield increase does not increase income. If the manure alone is applied, soil fertility and cost are reduced, Therefore, in order to increase the grain yield year by year, the more the land is planted, the more “fat” it is necessary to apply fertilizers and farm manure together. There are three technical points: