论文部分内容阅读
本文研究了主要栽培因子（品种、氮肥、钾肥和植株密度等）对早稻纹枯病的影响。结果表明：纹枯病的发展随施氮量的增加而加重，其敏感点为纯氮７．５～１２．５ｋｇ／６６７ｍ２；品种间抗感差异明显，其感病程度可分为３类，浙辐８０２和先锋一号发病轻为Ⅰ类；二九丰和湘早籼３号为Ⅱ类；二九青和双矮早发病较重为Ⅲ类。品种与施氮量互作效应对病情发展影响显著；氮、钾肥和植株密度对纹枯病进展速率的影响是氮肥＞植株密度＞钾肥。其交互作用明显的是氮肥和钾肥的互作。
In this paper, the effects of major cultural factors (varieties, nitrogen, potash and plant density) on rice sheath blight were studied. The results showed that the development of sheath blight aggravated with the increase of nitrogen application rate, and its sensitive point was 7.5 ~ 12.5kg / 667m2 of pure nitrogen. There were significant differences in resistance between varieties, Zhejiang radiation and Pioneer Pioneer 802 light type Ⅰ; two nine Feng and Xiang Zaozhong on the 3rd as Class Ⅱ; two green and double short incidence of severe as Class Ⅲ. The effect of interaction between the varieties and the amount of nitrogen had a significant effect on the disease development. The effect of N, K fertilizer and plant density on the rate of sheath blight was nitrogen fertilizer> plant density> potassium fertilizer. The obvious interaction is the interaction between nitrogen and potassium.