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本研究以小麦赤霉病为对象,进一步探讨在不同计算方法下7种分级标准所得病情指数的差异及误差。论证了现行病情指数计算方法的不合理性,并提出了新的计算公式。结果表明,病情指数与实际值的误差主要不在于分级方法,是传统的计算方法造成了这种误差。传统计算方法用不同分级标准所得病情指数之间及其与实际病情指数之间有极显著误差。而用改进算法时,不同分级方法所得病情相近,也与实际值相符。
In this study, wheat scab was used as the object to further explore the difference and error of the disease index obtained from the seven grading standards under different calculation methods. The irrationality of the current disease index calculation method is demonstrated, and a new calculation formula is proposed. The results show that the error of disease index and actual value is not mainly based on the classification method, which is caused by the traditional calculation method. The traditional calculation method used different grading criteria to get the disease index between the index and the actual disease index between the extremely significant error. With the improved algorithm, the results obtained by different grading methods are similar, but also consistent with the actual value.