主要栽培因子对稻纹枯病病情进展的影响

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

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。

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.