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中文摘要：
为研究精量播种条件下玉米出苗率对产量的影响，采用‘郑单958’、‘京科968’和‘晋单73’3个玉米杂交种，在田间单粒播种条件下设置80％、85％、90％、95％和100％，5种出苗率，测定群体产量的变化。结果发现，3个品种的株高和穗位高不受出苗率影响，但果穗单穗重和穗长随出苗率的降低而增大，相反秃尖长度则减小。3个品种的产量在出苗率为100％时最高，随着出苗率的降低，产量呈现先轻微下降后显著下降的趋势，‘郑单958’和‘京科968’在出苗率低于95％时产量开始显著下降、而‘晋单73’则在低于90％时才显著下降。因此，为保障单粒播种玉米的高产稳产，‘郑单958’和‘京科968’的种子出苗率应该达到95％以上，‘晋单73’应达到90％以上。
英文摘要：
To clarify the effect of seedling emergence ratio on grain yield in maize, maize cultivars＇Zhengdan 958＇, ＇Jingke 968＇ and ＇Jindan 73＇ were selected as experimental materials. After seedling setting, plants were shinned to densities of 80% ,85% ,90% ,95% and 100% of the full density for each cultivar,which mimicked the corresponding seedling emergence. The growth and population yield of individual plant were investigated. The results showed that：The plant and ear height of three cultivars were not affected by thinning,while the weight and length of the ear increased,and the length of bare tip decreased when the seedling emergence ratio decreased; The yield reached the highest at 100% density for all three cultivars, and decreased with the decreasing of seedling emergence ratio. For cultivars Zhengdan 958 and Jingke 968, the yield decreased slightly when seedling density decreased from 100% to 85%, and the yield decreased significantly when the seedling density decreased further. Meanwhile, the yield of cultivar Jindan 73 slightly decreased when the seedling density decreased from 100% to 90% ,and then decreased significantly when the seedling density decreased further. This research suggested that the seedling emergence ratio should be higher than 95% for cultivars Zhengdan 958 and Jingke 968,and higher than 90% for cultivar Jindan 73 to guarantee high crop yield.
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