论文部分内容阅读
近年来,化肥施用量由每亩30～40斤增加到60～100斤。虽然对农业生产起了重要作用,但经济效果却越来越低,增产不增收,给农民带来了损失。究其原因,关键是施肥技术不当所致。如多年来化肥以撒施为主,施在地表2～3天后才灌水,肥分挥发损失可达31—57%,据测定一斤碳铵仅增产粮食0.7～1斤,效果很差;施用单一化肥品种,使土壤内氮、磷比例严重失调,限限制了肥效的发挥;重视化肥,忽视农家肥,用地不养地,使
In recent years, the amount of chemical fertilizer increased from 30 to 40 kg per mu to 60 to 100 kg. Although it plays an important role in agricultural production, its economic effect is getting lower and lower, increasing output does not increase income, bringing losses to farmers. The reason, the key is due to inappropriate fertilization techniques. For example, the main application of chemical fertilizer is Isaacs, which is applied on the surface for 2-3 days before it is irrigated. The volatile loss of fertilizer is up to 31-57%. According to the test, a pound of ammonium bicarbonate is only increased by 0.7-1kg of grain, Single fertilizer varieties, so that the soil nitrogen, phosphorus serious imbalance, limiting the effectiveness of fertilizer to play; attention to fertilizers, neglect of manure, land is not raised, so that