Effects of Nitrogen Rate on Blast Resistance and Grain Yield of Super Early Hybrid Rice Luliangyou 996

施氮量对超级杂交早稻陆两优996产量和抗瘟性的影响（英文）

Super early hybrid rice Luliangyou 996 was the materials for this experiment. This paper focused on the influences of different nitrogen rates on blast resistance and grain yield. Studies suggested that with the increase of nitrogen rate,there were no distinct changes in the sick grain rate and sickness index, but the fifth grade of panicle blast rate rose gradually. When the nitrogen was too much（270 kg/hm^2）, the sick grain rate and sickness index were the highest. The yield rose along with the addition of nitrogen if the amount of applied nitrogen was within the range of 0 to 180 kg/hm^2, and the yield would decrease with the addition of nitrogen if the amount of applied nitrogen was over 180 kg/hm^2. Considering the sickness, output and economic benefit of rice, it is better to applied 90 to 135 kg/hm^2 of nitrogen for Luliangyou 996.

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/hm^2）病穗率和病情指数都最高;施N量在0~180 kg/hm^2范围内产量随着施氮量的增加而增加,施N量超过180 kg/hm^2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/hm^2为好。