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分别研究了品种、施氮量及其互作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,施氮量(N)与病害发展速率比值(RR)关系模型是:RR=1.07899/[1+1.21482EXP(-0.22775*N)]。纹枯病对氮量的灵敏点在每亩施纯氮7.5—12.5公斤内;品种间抗感差异明显,其感病程度可分为三类,各类品种系数可互换;品种与施氮量互作对病情发展影响显著,施氮量对品种抗感性有一定影响,组建了各类品种系数与施氮量关系的数学模型。
The effects of variety, amount of nitrogen application and their interaction on sheath blight of early rice were studied. The results showed that the development of sheath blight aggravated with the increase of nitrogen application rate. The model of RR (RR = 1.07899 / [1 + 1.21482EXP (-0.22775 * N) ]. Rhizoctonia solani was the sensitive point of nitrogen in 7.5-12.5 kg per hectare of pure nitrogen; significant differences between the varieties of resistance, the susceptible degree can be divided into three categories, various types of coefficient interchangeable varieties and nitrogen The effect of quantity and interaction on disease development was significant. Nitrogen application had a certain impact on the anti-susceptibility of varieties, and a mathematical model was established for the relationship between coefficient of variety and nitrogen application rate.