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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。
In order to study the effect of emergence rate of maize on yield under precision sowing conditions, three maize hybrids of ’Zhengdan 958’, ’Jingke 968’ and ’Jindan 73’were set at 80% 85%, 90%, 95% and 100%, 5 kinds of emergence rate, the determination of changes in population output. The results showed that the height and ear height of three cultivars were not affected by the emergence rate, but the single panicle weight and the spike length of panicles increased with the decrease of emergence rate, while the length of spikelet decreased. The yield of the three cultivars was the highest when the emergence rate was 100%. With the decrease of the emergence rate, the yield showed a slight decrease at first but a significant decrease. The yield of ’Zhengdan 958’ and ’Jingke 968’ was less than 95% When the production started to drop significantly, while the ’Jin Dan 73’ was less than 90% decreased significantly. Therefore, in order to ensure the high yield and stable yield of single sowing corn, the seed germination rate of ’Zhengdan 958’ and ’Jingke 968’ should reach more than 95%, and ’Jindan 73’ should reach over 90%.