利用裂区试验研究了追肥时期和种植密度对小麦新品种豫农202产量及其构成因素的影响.结果表明,追肥时期对豫农202产量的影响达到显著水平,对其产量构成因素影响较小,均不显著;种植密度则影响较大,除对千粒重的影响不显著外,对穗数和穗粒数影响达到显著水平,对产量的影响达到极显著水平.在不同的肥力条件下,各种植密度间产量差异较大,产量构成因素也存在一定差异.在不同追肥和种植密度条件下,稳粒数和穗数对产量的直接影响较大.适当推迟追肥期和180万～240万·hm-2的基本苗有利于发挥豫农202的产量优势.%A split-plot experiment was carried out to study the effects of top-dressing time and planting density on yield and components of new wheat cultivar Yunong 202. The results showed that top-dressing time had a significant effect on yield but not on its components. Planting density had a highly significant effect on yield and on the spike number per hectare and grain number per spike but not on 1 000-grain weight. There were great yield difference and some components difference among planting densities in different top-dressing time. Grain number per spike and the spike number per hectare had a larger direct effect on yield in the different treatments of planting density and top-dressing time. Postponing top-dressing time and controlling planting density with 1.8 million ～ 2.4 million plants · hm-2 can increase the yield potential of wheat cultivar Yunong 202.
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