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应用~(15)N 示踪技术,根据作物在石灰性土壤上对不同氮肥中氮素的吸收利用、氮素平衡和对磷、钾吸收量的差异所取得的研究结果表明,冬小麦对肥料氮和土壤氮的吸收利用与氮肥形态有关。尿素与硫铵的氮素利用率高于碳铵,肥料氮的损失量碳铵>硫铵>尿素,而在土壤中残留量则尿素>硫铵>碳铵,肥料氮的损失量与土壤中残留量呈显著负相关。施用碳铵的土壤供氮力(A 值)及激发卒高于硫铵与尿素。土壤供氮力与作物对土壤氮的吸收量间具有线性相关关系。碳铵的相伴阴离子有助于冬小麦对土壤氮的吸收。
Based on the tracing technique of ~ (15) N, the results of the study on the differences of nitrogen uptake and utilization, nitrogen balance and phosphorus and potassium uptake of different nitrogenous fertilizers in calcareous soil showed that the effect of winter wheat on fertilizer nitrogen And nitrogen uptake and utilization of soil nitrogen forms related. Urea and ammonium sulfate nitrogen utilization rate is higher than that of ammonium bicarbonate, the loss of fertilizer nitrogen ammonium> ammonium sulfate> urea, while the residual amount of soil urea> ammonium sulfate> ammonium bicarbonate, fertilizer nitrogen loss and soil Residues showed a significant negative correlation. Soil ammonium nitrogen supply (A value) and challenged with ammonium bicarbonate were higher than ammonium sulfate and urea. There was a linear correlation between soil nitrogen supply and crop nitrogen uptake. The accompanying anion of ammonium bicarbonate is helpful to the absorption of soil nitrogen by winter wheat.