摘要
田间调查和统计分析结果表明：烟草病毒病病株分布在病株率＜２１％时一般呈聚集格局，病株率为２１％～３２％时呈随机格局，而当病株率＞４５％时则呈均匀格局。病级分布在病株率＜３１％时一般为聚集格局，而当病株率＞３１％时则转变为均匀格局。本研究还确定了烟草病毒病的平均严重度和病情指数与病株率之间存在的回归关系，并推导了以累计病株数估测田间发生程度的序贯抽样模型。
The results of field investigation and statistical analyses indicated that the distribution of the tobacco virus disease plants assumed aggregative pattern when the percentage of the diseased plants (P) was below 21%,randow pattern. When 21%<P < 32%, and regular pattern when P > 45% with the increasing of the percentage of the diseased plants, their distribution tended to transform from aggregative to random, then to regular pattern. And the distribution of the seriousness was generally in aggregative pattern when P<31 % and in regular one When P>31 %. The regressive analysis was made to show the relationship between the mean seriousness(Sm),and p, and the one between the disease inder (Di) and P. Finally, the sequential sampling models were established by which the incidence of the disease could be estimated from the accumulative total of the diseased plants.
出处
《安徽农业科学》
CAS
1995年第2期139-141,共3页
Journal of Anhui Agricultural Sciences
关键词
烟草
病毒病
空间分布
病情估计
序贯抽样
Tobacco virus disease, Sepatial distribution, Incidence estimation, Sequential sampling
