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应用~(15)N示踪法进行的盆栽试验表明,在新疆耕作土壤中,施氮水平对作物吸收肥料氮和土壤氮影响很大。在低氮水平(尿素240kg/hm~2)下,作物体内的氮素30％来自肥料,70％来自土壤;在高肥水平(尿素480kg/hm~2)下,作物体内的氮素50％来自肥料,50％来自土壤。于新疆7种耕作土壤上栽种春小麦,玉米,棉花,甜菜及水稻5种作物,施入的氮肥只有30％—40％被作物利用,20％左右残留在土壤中,30％—40％呈气态损失。设法减少氮肥的气态损失是提高氮肥利用率的主要途径。
Pot experiments using ~ (15) N tracing method showed that nitrogen fertilization had a great effect on crop nitrogen and soil nitrogen uptake in tillage soils in Xinjiang. Under the low nitrogen level (urea 240kg / hm ~ 2), 30% of the crop nitrogen comes from the fertilizer and 70% comes from the soil. At the high fertilizer level (urea 480kg / hm ~ 2) From fertilizer, 50% comes from soil. Five kinds of crops such as spring wheat, corn, cotton, sugar beet and rice were planted on 7 cultivated soils in Xinjiang. Only 30-40% of the applied nitrogen fertilizer was used by the crop, and about 20% remained in the soil, 30-40% loss. Trying to reduce the gas loss of nitrogen fertilizer is the main way to improve nitrogen fertilizer utilization.