Efect of release-controlled urea application on the N uptake and yield of soybean

The effect of release-controlled urea application on the N uptake．yield and quality of soybean is described in this paper．The results show that release-controlled urea can increase the N efficiency by 3．06％～11．93％，increase the residual N by 1．25％～15．89％ in the sandy soil，it also increases the soybeslq yield by 21．69％-49．22％ and improves the soybean quality．