不同密度下玉米株高、穗位与抗倒性的关系研究

Research on the Relationship between Plant Height,Ear Height and Lodging Resistance of Maize at Different Planting Intensity Level

以自主组配的20个玉米新组合作为试验材料,研究种植密度对玉米株高、穗位、倒伏状况及其之间的关系。结果表明,玉米株高随密度的增加略有提高,而穗位、穗高系数却明显降低;倒伏倒折率随密度的增加而明显提高,其中倒折率受影响最大。在60 000株/hm^2密度下株高与倒伏率、倒伏倒折率呈极显著正相关,而穗位、穗高系数与3个倒伏指标相关不显著;在52 500株/hm^2和75 000株/hm^2密度下株高、穗位、穗高系数与3个倒伏指标相关不显著。

Using20new combinations of maize matched automatically as test materials,the effect of planting intensity on maize plant height,ear height,lodging resistance status and the relationship between them were studied.The results showed that:The plant height increased slightly and the ear height,the spike position height coefficient were decreased significantly as intensity increased;The lodging and breaking rate increased significantly as intensity increased,in which the breaking rate was impacted slightly larger.At a density of60000plants/hm2,the plant height had extremely significant positive correlation with the lodging and breaking rate,but the correlation were not significant between the ear height,the spike position height coefficient and the three lodging indexes.At density of52500plants/hm2and75000plants/hm2,the correlation were not significant between plant height,ear height and three lodging indexes.