摘要：2015-2016年，选用耐密、适应性广的高产品种先玉335、郑单958和KX3564为试验材料，设置从1000株/666.7m2至12000株/666.7m2不同密度处理，研究种植密度对玉米产量及果穗性状的影响。结果表明：在不同种植密度下，各品种产量均随着密度呈先增加后减少的趋势，符合二次曲线关系，由拟合方程得到最高产量为1283.97 kg/666.7 m2，低于实际最高单产，三个品种连续两年在6000株/666.7m2密度下获得最高产量。相关分析显示，单穗粒重、行粒数与产量呈极显著正相关。随着密度的升高，穗行数、行粒数、穗长、穗粗、单穗粒重下降，秃尖长增加，其中行粒数、穗长与密度呈二次函数关系；百粒重、单穗粒重与密度呈一般线性关系，且都呈极显著负相关。在保证合理密植条件下，通过协调好穗长与行粒数、穗粗与行粒数、百粒重与穗行数之间的关系，使行粒数为40.14，穗长为20.08cm，百粒重为209.88g，单穗粒重为301.88g，具备这样的优良性状更容易在当前密度下获得高产。
英文摘要:
Abstract: During the 2015-2016 years, Using of high-yielding varieties with high density tolerance and wide adaptability of Xianyu335, Zhengdan958 and KX3564 as experimental materials. Set from 1000 plant/666.7m2 to 12000 plant/666.7m2 different density treatments, the study of planting density on yield and ear characteristics in Maize. The results showed that under different planting density, the yield of each varieties showed a trend of increasing first and then decreasing, and it conformed to the quadratic curve, The maximum yield of 1283.97 kg/666.7 m2 by fitting equation is lower than the actual maximum yield. Three varieties for two consecutive years at 6000/666.7m2 density to obtain the Maximum yield. Correlation analysis showed, There was a significant positive correlation between kernel weight per ear and kernel number per row and yield. With the increase of density, kernel rows per ear, kernel number per row, ear length, ear diameter, kernel weight per ear were decreased, and bare tip length was increased. Among them, the kernel number per row, ear length and density were the second order function, and 100 kernel weight and kernel weight per ear were linearly related to the density, and all of them showed a significant negative correlation. In order to ensure the rational close planting conditions, through the coordination of the ear length and kernel number per row, ear diameter and kernel number per row, 100 grain weight and the relationship between the kernel rows per ear. The kernel number per row was 40.14, ear length was 20.08cm, 100 kernel weight was 209.88g, the kernel weight per ear was 301.88g, with such fine traits easier to obtain high yield under current density.
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