主要栽培因子对稻纹枯病病情进展的影响

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。

The Effects of Main Culture Factors on Rice Sheath Blight Development.

This paper deals with the effects of main culture factors(rice variety, nitrogen and potash fertilizer,density) on rice sheath blight(RSB).The results showed that the effect of N fertilizer was sig-nificant,the sensitive point of effect of N fertilizer to RSB was 7.5-12.5kg/667m² of pure nitrogen.The resistance and susceptibility of varieties were different and could be eparated into 3 ranks :type Ⅰ was light access including Zhefu 802 and Pioneer 1;type Ⅲ was heavy access including Erjiuqing and Shuang-aizhao ; type Ⅱ was between type Ⅰ and Ⅲ including Erjiufeng and Xiangzhaoxian 3. The interaction of various factors on RSB were also studed.