一、要深施尿素不管作底肥或追肥 ,均应深施覆土。深施可以控制尿素的水解速度 ,使其均匀释放出氮素营养 ,防治氮的挥发损失 ,提高尿素利用率。据试验调查 ,尿素深施１０ 的可比浅施１～５ 的增产４０%左右 ,平均每公斤尿素可增产粮食２～３ （公斤）。二、要早施尿素施入土壤? First, to deep urea regardless of whether as a base fertilizer or dressing, should be deep soil cover. Shen Shi can control the rate of hydrolysis of urea, nitrogen nutrients to its uniform release, prevention and control of volatile nitrogen losses, improve urea utilization. According to the experimental investigation, the yield of 10% urea is about 40% higher than that of 1 ~ 5, and the average yield of grain per kilogram of urea is 2 ~ 3 kg. Second, as early as the application of urea into the soil?