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尿素在酒泉地区对小麦作追肥时,利用率只有30—40％。用作基肥深施10厘米左右,利用率可提高到40—50％,但当用量过多或与种籽相隔距离太近时,容易腐蚀籽种,造成缺苗断垅。在耕作中如果一次大量施用,往往引起烧苗或徒长;如果分期追施,不仅多费劳力,且在作物密植条件下,用作追肥就不可能深施,因而造成氨态氮的挥发损失。为了提高尿素利
Urea in the Jiuquan area for wheat top dressing, the utilization rate of only 30-40%. Used as basal fertilizer applied about 10 cm, the utilization rate can be increased to 40-50%, but when the amount is too much or too close to the seeds when the seeds are easy to corrode, resulting in lack of broken seedlings. If a large amount of cultivation is applied, it often causes the burning seedling or leggy growth. If the seedling is topdressing, it will not only be laborious but also can not be applied deeply for the top dressing under dense planting conditions, resulting in the volatile loss of ammonia nitrogen. In order to improve urea profit