高秆稀植大穗型玉米的密植潜力研究

以11个高秆稀植大穗型辽宁省主栽玉米品种为试材，通过6个密度进行增密增产潜力试验。结果表明：适当增加密度可提高生物产量和叶面积指数并使光合速率、叶绿素含量和透光率保持较高水平；在42 000株/hm²基础上，增加密度可显著提高产量。有10个品种可增加密度12.5%以上，其中有5个品种增产10%以上。个别品种增密和增产幅度超过20%。

Study on Densities Potential of High-stalk and Rare-planting Maize

Eleven high-stalk, rare-planting type maize cultivars were tested in six planting densities in order to study the yield potential. The results showed that with a moderate elevation of the density, biological yield and leaf area index could gain a concomitant increasing, and photosynthetic rate, chlorophyll content and transmittance were maintained a high level. On the basis of 42 000 plants/ha, the yield could increase with the elevation of the density. If the density increased by 12.5%, ten cultivars could obtain more than 5% increase production, while if the density increased by 20%, most of the cultivars could obtain more than 10% increase production. Some individual varieties had larger scopes of increase density and increase production.