玉米抗倒伏性指标及其模拟研究

通过玉米品种比较试验和密度试验,研究了9个农艺性状与3个茎秆质量性状的关系。结果表明,茎秆田间抗拉弯强度和室内横折强度能综合反映茎秆质量好坏,而茎秆穿刺强度可作为玉米育种群体和耐密品种选择的抗倒性指标。茎秆田间抗拉弯强度可用密度、茎粗和气生根数3个性状进行线性估计;茎秆室内横折强度可用穗位高度、茎粗和茎秆穿刺强度进行有效估计。

Selection and estimation of indices of stem-lodging resistance in corn

This experiment studied the relationship between nine agronomic characteristics and three stem quality characteristics related to stem-lodging resistance of corn,using comparative trial of more than twenty varieties extended in recent years in Shaanxi province and ten-level density experiment of varieties of Hudan-4# and Shandan-9#.The results show:the stem quality of corn could be reflected by stalk bending strength in the field and stalk lateral breaking strength in the lab,rind penetration strength can be used as a selection index of corn breeding populations and density tolerance varieties.Stalk bending strength of variety in the field could be estimated at density,stem diameter and number of brace root,and stalk lateral breaking strength in the lab could be estimated at height of ear,stem diameter and rind penetration strength.