豫中南夏玉米高产稳产适宜种植密度研究

摘要

Six planting densities were designed to screen a suitable one for the two maize cultivar Zheng-dan 958(ZD958) and Luoyu 336(LY336).The results showed that ZD958 had stronger population self-reg-ulating ability and better tolerance to high density compared with LY336.The yield of ZD958 showed a linear increasing trend with the increase of planting density in a range of 3 500 ~6 000 plants per 666.7m2 .It reached the highest as 612.5 kg under the planting density of 6 000 plants per 666.7m2 .The optimum plant-ing density was 4 500 plants per 666.7m2 for LY336.The SPAD value was influenced largely by different planting densities and cultivars.The mean of SPAD value in LY336 was higher than that in ZD958.%对郑单958和漯玉336两个品种在6个不同密度条件下进行研究，结果表明：郑单958的群体自我调节能力、耐密性较漯玉336好，在666．7m2种植密度3500～6000株范围内其产量随密度增加而增加，呈直线增加趋势，6000株时产量最高为612．5 kg；漯玉336的最佳密度为4500株。密度与品种对SPAD值的影响大，漯玉336的SPAD均值大于郑单958。