论文部分内容阅读
有些农民认为尿素物理性状好,不象碳酸氢铵那样容易挥发,因此用尿素作追肥时,往往表层浅施,不注意覆土盖严,甚至地表撒施。这样是很不科学的。尿素是酰氨态氮肥,施入土壤后要经过土壤微生物的作用,转化成碳酸铵后,才能被作物吸收利用。如果把尿素表层浅施,不覆上盖严,甚至地表撒施,那么尿素在转化过程中会引起氨的挥发损失。若追施量大,挥发出的氨气还会熏伤作物茎叶。在石灰性土壤
Some farmers think that urea has good physical properties and is not as volatile as ammonium bicarbonate. Therefore, when urea is used as top dressing, it tends to be superficial and does not pay attention to the tight cover and even the ground surface. This is very unscientific. Urea is amido nitrogen fertilizer, applied to the soil after the role of soil microorganisms, into ammonium carbonate, the crop can be absorbed and utilized. If the urea surface shallow facilities, do not cover the cover tightly, and even the surface spread, then urea in the conversion process will cause the loss of ammonia volatilization. If chasing a large amount of volatile ammonia will also smoked crop stems and leaves. In calcareous soil