【摘要】 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％更多还原

【Abstract】 NDFF%(Nitrogen derived from fertilizer) dynamic display in different growing period of corns were studyed by 15 N coated urea. NDFF% in control group was higher than that in treatment group in primary period. NDFF% in treatment group was higher than that in control group in intermediate and late period. The utilized coefficient of nitrogen was improved by corn. The relative transfer speed rate of 14 C tracer assimilate in treatment groups higher significantly than that in control group. The field experiment showed that there were significance effect of coated urea on corn growth,100 grain weight and single plant grain weight. The average of single plant grain weight was increased by 17.8%. The gross harvest was increased by 14.7%￣20.0%.更多还原