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以超级杂交早稻陆两优996为材料,研究不同施氮量对其稻瘟病抗性和产量的影响。结果表明:随着施N量的增加,病穗率和病情指数并无明显的变化规律,但5级瘟穗率逐渐升高,当施N量过大时(270 kg/hm2)病穗率和病情指数都最高;施N量在0~180 kg/hm2范围内产量随着施氮量的增加而增加,施N量超过180 kg/hm2后产量随着施氮量的增加反而下降;综合考虑稻穗病发病情况、产量和经济效益,陆两优996以施N量90~135 kg/hm2为好。
The effect of different nitrogen rates on the resistance and yield of rice blast was studied using the super hybrid early rice Lu Liangyou 996 as material. The results showed that with the increase of N application rate, there was no obvious change rule of disease panicle index and disease index, but the rate of grade 5 blast increased gradually. When the amount of N applied was too large (270 kg / hm2) And the disease index were the highest. The yield of N increased from 0 to 180 kg / hm2 with the increase of N application rate. However, the yield decreased with the increase of N application rate when N application rate exceeded 180 kg / hm2. Taking into account the incidence of panicle disease, yield and economic benefits, the two Liangyou 996 N application rate of 90 ~ 135 kg / hm2 is better.