酒泉地区有耕地一百多万亩,耕层多属石灰性土壤,呈微碱性。北部河流下游有盐碱地分布,PH值在7.5—8.2之间,碳酸钙含量一般在10—20％。从各地田间试验结果看,氮肥利用率偏低,碳铵为25％,硫铵在30—40％左右。施入土壤中的铵态氮肥是如何损失的呢?围绕这个问题,我们作了下列试验。 Jiuquan area has more than one million acres of arable land, mostly plowed soil calcareous soil, was slightly alkaline. Saline alkali distribution in the lower reaches of the northern river, PH value between 7.5-8.2, calcium carbonate content is generally 10-20%. From the field test results across the field, nitrogen utilization rate is low, ammonium bicarbonate is 25%, 30-40% ammonium sulfate. How is ammonium nitrogen applied to the soil lost? Around this issue, we made the following test.