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在中国冬油菜区9省12个地点,共用20个品种在8年时间中作了62个油菜播种期与病毒病关系试验,共计310期。结果表明: 就整个冬油菜区而言,油菜角果发育期病毒病发病率是随播种期延迟而渐次下降的,二者的线性关系极显著。在各地正常播种期前后各延伸二旬范围内,播种期每推迟一句,发病率平均降低4.8％,但在不同油菜产区,这种相关性和相关形式有很大差别。在北方冬油菜区病毒病随着播种期的推迟成减速度下降,二者成对数曲线关系,是全国各油菜产区中,播种期对病毒病影响最大的地区。长江流域病害与播种期关系也很明显,二者成线性回归关系,病害随播种期后延而下降的速度不及北方冬油菜区。此区的中、下游地区,播种期对病害的
In the Chinese winter rapeseed area 9 provinces, 12 locations, a total of 20 varieties in eight years made 62 rapeseed and virus disease test, a total of 310. The results showed that for the whole rapeseed area, the incidence of virus disease in rape pod development stage decreased gradually with the delay of sowing date, and the linear relationship between the two was extremely significant. In each area around the normal sowing date, the delay of one sowing period decreased by 4.8% on average, but in different rapeseed areas, the correlations and related forms were quite different. In the northern winter rapeseed area, the virus disease decelerated with the delay of sowing, and the relationship between the two was a logarithmic curve. It was the most affected area in the rapeseed producing areas and sowing period in the country. The relationship between the disease and sowing stage in the Yangtze River Basin is also obvious. The two are linear regression relationship, and the disease decline with the delay of sowing stage is less than that of the northern winter rapeseed. This area of the middle and lower reaches of the area, the sowing of the disease