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榆林地区推广的化肥有氮素化肥和磷素化肥两种。氮素化肥主要有尿素、碳酸氢氨、硫铵等,磷素化肥有过磷酸钙等。 (一) 氮素化肥肥效高,效力快,施用方便,增产显著,因此推广以来,很受群众欢迎,对解决肥料缺乏,提高农作物产量起了重要作用。当前推广的氮肥都是速效性肥料,很易溶解于水,可随水上下移动,为作物根系吸收利用。因此氮肥适宜用作追肥。但是,榆林地区气候干旱,雨量稀少,氮肥用作追肥除了水地
Yulin fertilizer to promote two kinds of nitrogen and phosphorus fertilizer. Nitrogen fertilizers are mainly urea, ammonium bicarbonate, ammonium sulfate, phosphorus fertilizer, such as superphosphate. (I) Nitrogen fertilizers have high fertilizer efficiency, fast efficacy, convenient application and significant yield increase. Therefore, they are popular with the masses and play an important role in solving the problem of lack of fertilizers and increasing the yield of crops. The current promotion of nitrogen fertilizers are quick-acting, easily soluble in water, with the water up and down for the root absorption and utilization of crops. Nitrogen fertilizer is therefore suitable for top dressing. However, Yulin climate arid, scarce rainfall, nitrogen fertilizer used for topsoil addition to the water