不同密度处理对玉米自交系产量及农艺性状的影响

摘要

The effects of population density on the grain yield and agronomic traits of inbred lines were studied in Shenyang Agricultural University in 2014. The results show that: the population density has a significant impact on agronomic traits and grain yield of inbred lines with different plant types. With the increase of population densities, the plant height and ear height of inbred lines increased, and the stem diameter decreased, while tassel branches didn’t have significant differences. And inbred lines with different plant types had the same variation tendency. The order of leaf orientation value growth with population increase rate was: upright-leaf inbred lines >semi-upright-leaf inbred lines >spreading-leaf inbred lines. While the leaf area of three-ear-leaves decreased with the increase of population density.%试验采用不同密度处理对玉米自交系主要农艺性状进行研究。结果表明，密度对不同株型自交系的农艺性状和产量及其构成因素具有显著影响。随着密度增加，产量差异显著，在超过阈值后，产量反而下降；各自交系株高和穗位高均增加，茎粗降低，而对雄穗分枝的影响差异不显著，不同株型自交系呈现出相同变化趋势；不同株型棒三叶叶向值变化趋势不同，紧凑型叶向值增加最大，半紧凑型次之，平展型变化最小；棒三叶叶面积呈现降低趋势。