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植保统计是描述农作物病虫草鼠发生和危害程度的一种方法和手段。统计资料是分析和决策的依据。统计方法的正确与否直接关系到统计结果的准确性,影响到资料的可靠性和分析决策的正确性。目前,植保统计方法中的常出现一些误差现象,现就一种常见的统计误差作一剖析。表1为镇江市1992年小麦赤霉病防治统计表。由表可知,镇江市下属4个县的小麦赤霉病发生情况及防治水平均存在一定的差异,如采用算术平均法计算病穗率,病指和
Plant protection statistics is a method and means to describe the occurrence and damage degree of crop pests, weeds and rats. Statistics are the basis for analysis and decision-making. The correctness of statistical methods is directly related to the accuracy of statistical results, affecting the reliability of data and the correctness of analysis and decision-making. At present, some error phenomena often appear in the statistical methods of plant protection, and now a common statistical error is analyzed. Table 1 for the 1992 Zhenjiang City, wheat scab mold prevention and control statistics. As can be seen from the table, there are some differences in the occurrence and control levels of wheat scab in four counties under Zhenjiang City. For example, using the arithmetic mean method,