【摘要】 采用３因素５水平最优回归设计测定氮磷钾肥对水稻纹枯病发生程度的综合影响效应，结果表明：氮磷钾对水稻纹枯病发生有显著影响，低中水平时，氦肥促进病害发生发展，磷钾肥抑制病情扩展，而高水平时作用效应则与低中水平相反。在目前施肥水平下，一般年份都应防治本病１～２次。更多还原

【Abstract】 The relationship between the rate of diseased plant of rice sheath blight dis-ease and N,P2O5,K2Oapplication was studied.The rate of diseased plant was significantlycorrelated to the application level of N,P2Os,K2O更多还原