玉米抗倒性与茎秆穿刺力和拉力关系的初步研究

利用自行设计的茎秆穿刺和拉力仪,在玉米不同生育时期对我国41个不同玉米杂交种茎秆进行穿刺力和拉力试验,研究茎秆穿刺力和拉力与倒伏性的关系。结果表明,地上部第3茎节穿刺力能较好反映出穿刺力与倒伏的关系;主茎与地面呈45°夹角时的拉力能较好反映出拉力与倒伏的关系;茎秆穿刺力和拉力与倒伏性呈极显著相关。密度、茎秆穿刺力和茎粗是影响茎秆倒伏的主要因素,茎秆穿刺力和拉力可以作为测量玉米倒伏的指标。

Primary Study on Correlation Between Corn Variety LodgingResistances and Its Stem Puncture-Pull Strength

In the different growth periods of the 41 corn varieties, it was made for the study on correlation between corn lodging resistance and its stem puncture-pull strength by the utilization of the puncture-pull equipment designed by ourselves. The result indicated that the puncture strength of the varieties stem third over ground were significant negative relationship with its lodging resistance. Also, the pulling power of varieties stem were significant positive relationship with its lodging when the angle between the variety stem and level ground hold 45°. The variety planting density, stem puncture strength, and stem diameter were the principal direct factors for variety lodging resistance. In hence, the strength of variety stem puncture and pull were acted the target for variety lodging resistance.