不同种植密度对洛单248产量及群体生理指标的影响

Effects of Different Planting Densities on Yield and Population Physiological Indices of Luodan 248

[目的]对玉米(Zea mays L.)新品种洛单248在不同种植密度下的产量及群体生理指标进行研究,为提高其单产和总产提供科学依据。[方法]5个种植密度分别为4.50万、5.25万、6.00万、6.75万、7.50万株/hm2,4次重复。[结果]在6.00万株/hm2的种植密度下,群体叶面积指数发展动态合理,具有"前快、中稳、后衰慢"的特点,且群体叶面积持续时间较长,有利于叶片光合的进行,后期干物重增长最为迅速;通过产量分析得出,洛单248在豫西获得理论最高产量的种植密度为64 306.3株/hm2。[结论]洛单248在豫西种植的最佳密度为6.00万株/hm2。

[Objective] The purpose was to study the yield and population physiological indices of Luodan 248 under different planting densities,and provide a scientific basis for improving its yield per unit and total yield.[Method] Five planting densities were 4.50×104,5.25×104,6.00×104,6.75×104,7.50×104 plants per ha resp.,and each planting density had 4 repeatitions.[Result] Under planting density of 6.00×104 plants per ha,the population leaf area developed reasonably and had long duration with characteristics of ’fast at earlier stage,stable at middle stage,slow at later stage’,and was beneficial to photosynthesis,so the dry matter increased fastest in later stage.The planting density of obtaining the theoretical maximal yield of Luodan 248 was 64 306.3 plants per ha in western of Henan Province through analysis of yield.[Conclusion] Luodan 248’s best planting density is 6.00×104 plants per ha in western Henan Province.