用玉米沙培试验研究了玉米主根长，根鲜重，根干重和芽长、芽鲜重、芽干重及株鲜重、整株干重对麦谷宁的敏感性，结果表明，该药对玉米的根尤其是主根长抑制十分明显，回归分析表明，相关性很好（Ｒ２＞０．９），玉米主根长是麦谷宁生测方法十分理想的指标．低浓度的麦谷宁对玉米生长有促进作用，其临界浓度随玉米品种的不同而异 Corn sap culture experiments were conducted to study the sensitivity of maize root length, root fresh weight, root dry weight and shoot length, fresh weight of shoot, dry weight of fresh shoots and fresh weight of the whole plant to dry weight of whole wheat. The results showed that the drug The inhibition of maize roots, especially the main root length, was very obvious. Regression analysis showed that the correlation was very good (R2> 0.9). The maize root length was a very good indicator for Maizengning method. Low concentrations of Mai Gu Ning promote the growth of maize, the critical concentration varies with different maize varieties