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用１５Ｎ＿包膜尿素研究玉米不同生育期来自肥料的氮素百分数（ＮＤＦＦ％）的动态显示。生育初期对照组ＮＤＦＦ％高于处理组，而生育后期处理均高于对照组，提高了玉米对氮素利用率。１４Ｃ示踪同化产物相对质量转移速率，处理组显著高于对照组。田间试验结果表明，包膜尿素对玉米生长发育、百粒重、单株粒重有明显作用，单株粒重平均增加１７．８％，终产量增幅为１４．７％～２０％
A Dynamic Study of Percentage of Nitrogen Derived from Fertilizers (NDFF%) at Different Growth Stages in Maize Using 15N Coated Urea. The NDFF% of the control group was higher than that of the control group at the early stage of fertility, but higher at the later growth stage than that of the control group, which increased the nitrogen utilization rate of maize. 14C tracer assimilation product relative mass transfer rate, the treatment group was significantly higher than the control group. The results of field experiments showed that coated urea has a significant effect on the growth and development of maize, 100-grain weight and grain weight per plant, with an average increase of 17.8% in grain weight and an increase of 14.7% -20% in the final grain yield.