Effect of high density and high nitrogen fertilizer on resistance to powdery mildew and yield traits of south regional testing barley cultivars was studied. The main results showed as follows: disease severity and disease index of powdery mildew significantly increased at the 0. 01 level under high density and high nitrogen fertilizer, while total disease incidence was not significantly affected. As far as yield traits were concerned, 1 000-grain weight, panicle length, yield and grain yield per panicle significantly decreased at the 0. 05 and 0. 01 level; plant height significantly increased at the 0. 01 level; panicle number and seed setting rate were not significantly affected. There was great difference in the powdery mildew resistance of barley cultivars under high density and high nitrogen fertilizer, and one was resistant, the other one was sensitive to powdery mildew.%以南方大麦区试品系为材料,研究高密度、高氮肥水平对大麦白粉病抗病性及产量性状的影响.结果表明:高密度、高氮肥使白粉病严重度和病情指数极显著升高,对总病叶率影响不大;千粒重、穗长、产量及株穗重显著或极显著降低,株高极显著升高,而穗数、结实率不因密度、氮肥增加发生明显变化.在高密度、高氮肥条件下不同品系的抗病性存在较大差异,分为两种反应:一种对白粉病抗性基本无影响,另一种对白粉病抗性反应较敏感.
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