【摘要】 试验结果表明,不同施氮量间病株率和病情指数差异均极显著;施氮量300~375 kg/hm2与0~225 kg/hm2的病株率和病情指数差异极显著。病株率和病情指数以施氮量375 kg/hm2最高,平均为15.19%和13.21;不施氮的最低,平均为7.04%和4.62。施氮量0~375kg/hm2的处理产量损失率平均为3.56%~18.29%;施氮量、病株率、病情指数、产量损失率间呈极显著正相关。甘蓝型黄籽双低优质杂交油菜适宜施氮(纯N)量为150~225 kg/hm2,菌核病危害较轻,能获得3 000 kg/hm2以上高产。更多还原

【Abstract】 The results showed that there were very significant differences between percentage of diseased plant and index of disease in different amount of applied nitrogen.There were significant differences in the percentage of diseased plant and the index of disease between the applied amount of nitrogen of 300～375?kg/hm~2 and 0～225?kg/hm~2.The percentage of diseased plant and index of disease reached the highest value at applied amount of nitrogen of 375?kg/hm~2,and average value was 15.19% and 13.21 respectively.Non-nitrogen treatment was the lowest,and the average value was 7.04% and(4.62) respectively.At applied amount of nitrogen 0～375?kg/hm~2,the percentage of yield loss caused by disease was 3.56%～18.29%.There was significant positive correlation among the applied amount of nitrogen,percentage of diseased plant,index of disease and percentage of yield loss.The applied amount of nitrogen of 150～225?kg/hm~2 was suitable for yellow seed double-low hybrid rape,the harmness of Sclerotinia sclerotiorum was lighter and the yield can attain over 3?000?kg/hm~2.更多还原