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1.30多年生产实践和试验结果表明,我省主要农业土壤最感氮素足,其次为磷,再次为钾。在尽量积造农家肥的同时,积极生产氮磷化肥,不仅促进粮经作物增产,而且对地力的提高亦表现明显的趋势。氮磷配合,不仅提高肥效,而且可以提高种子品质。 2.水稻亩产1,000斤左右的适宜施氮量为在农家肥4—6斤/亩氮基础上,增施化肥氮15斤左右。小麦亩产600～800斤的适宜施氮量为在农家肥8—10斤纯氮基础上,增施化肥氮20斤左右。油菜亩产350斤左右的适宜施氮量为在农家肥18斤左右纯氮基础上增施化肥氮25斤左右。 3.氮肥适宜的用期,水稻和小麦均宜50—70％作底肥,肥力水平高的泥田甚至可以100％,沙田及丘陵区旱地,要注意拔节阶段施用少量氮肥以保证稻、麦穗多、穗大、粒重。油菜底肥中亦宜加入2—3斤纯氮,促进苗子早发。 4.氮肥深施是提高肥效的有效办法,以底肥全层施用较好,并且省工。一般可提高肥效10—20％。
1.30 years of production practice and test results show that the main agricultural soil in our province most sensitive to nitrogen, followed by phosphorus, potassium again. As far as maximizing farmyard manure, active production of nitrogen and phosphorus fertilizers will not only promote the increase of grain-and-grain crops, but also show a clear trend of improvement in soil fertility. With nitrogen and phosphorus, not only improve fertilizer efficiency, but also improve seed quality. 2. Rice yield of about 1,000 pounds per mu for nitrogen fertilizer in the manure 4-6 kg / acre nitrogen basis, an additional fertilizer about 15 pounds of nitrogen. Wheat suitable for 600 ~ 800 kg of nitrogen fertilizer rate of 8-10 pounds of peasant fertilizer on the basis of pure nitrogen, the application of fertilizer about 20 pounds of nitrogen. Rape per mu yield of about 350 kg of nitrogen for the amount of about 18 kg of farm manure on the basis of pure nitrogen fertilizer 25 kg or so. 3. Nitrogen suitable period of use, rice and wheat should be 50-70% of the base fertilizer, fertile land with high levels of mud can even 100%, field and hilly dry land, pay attention to the stage of jointing a small amount of nitrogen fertilizer to ensure that rice, wheat and more Spike large, grain weight. Rape base fertilizer should also be added 2-3 pounds of pure nitrogen, promote early seedling. 4. Nitrogen fertilizer is an effective way to improve fertilizer efficiency, full application of base fertilizer is better, and labor-saving. Generally increase fertilizer efficiency 10-20%.