Effect of eck treatment on the root system quality and yield of spring maize | 膦酸胆碱合剂对东北地区春玉米根系质量与产量的影响

chinois. 摘　　要：以不同品种京单28和先玉335为试材，通过设置5个种植密度，采用膦酸胆碱合剂（ECK）处理，研究化学调控技术对不同密度群体春玉米根系质量及产量的影响。结果表明，随种植密度的增加，京单28和先玉335根系气生根数和总根数下降，根系干物重和根系活力降低，两个品种的双穗率、穗粒数、百粒重和单株产量均下降，空秆率上升，不同处理的子粒产量呈先增加后下降的趋势，在56 250株/hm. 密度处理获得最高产量。经膦酸胆碱合剂处理后，两个品种不同密度的根系气生根数增加，根系干物重和根系活力提高，高密度条件下群体产量构成因素得到改善，两个品种均在90 000株/hm. 密度处理获得最高产量。研究表明，膦酸胆碱合剂能提高根系质量，缓解玉米群体的密度效应，可为实现密植群体高产稳产提供技术支持。

anglais. Two genotype maize varieties, jingdan28 and xianyu335 were used to elucidate the effect of planting density in five planting density and Synthetic plant growth regulators（ECK） on the root quality and the yield of maize. The results showed that with the increasing of planting density, the root quality, including the number of aerial root, total root, dry matter of root and the root activity were decrease;100-kernels weight, double-ear rate and plant yield were decreased, but no-ear rate presented opposite trend. The grain yields were increased and decreased successively, and reached the maximum at 56 250 plants/ha. The number of aerial root, total root, dry matter of root and the root activity were improved by foliage spray ECK at the 6 leaves expended stage of maize. The yield and yield components of two genotype maize varieties under high plant density were great improved, and reached the maximum at 90 000 plants/ha. The research showed that ECK can improve the root system quality and apply technical support for improving the yield of high-density.