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通过田间试验研究不同基因型玉米产量、N累积量和土壤N素表观平衡。结果表明,3个施N水平处理下不同基因型玉米间的产量、N累积量均存在显著差异。N肥在土壤中的表观残留率平均值由施N112.5kg/hm~2水平(Ⅰ)下的36.74％升至施N168.75kg/hm~2水平(Ⅱ)下的40.79％和施N225kg/hm~2水平(Ⅲ)下的48.36％。应用N累积量较高的玉米基因型可显著减少施用N肥在土壤中的残留率。
Field experiments were conducted to study the yield and N accumulation of different genotype maize and the apparent balance of N in soil. The results showed that there were significant differences in yield and N accumulation between different genotype maize under the three treatments of N level. The apparent N residual rate in soil increased from 36.74% at N112.5kg / hm ~ 2 level (Ⅰ) to 40.79% at N168.75kg / hm ~ 2 level (Ⅱ) and N225kg / hm ~ 2 level (Ⅲ) 48.36%. The application of N genotypes with higher cumulant could significantly reduce the residual rate of N application in soil.