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Horsfall-Barratt scale
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Horsfall-Barratt scale : ウィキペディア英語版
Horsfall-Barratt scale

The Horsfall-Barratt scale
is a system used in plant pathology to assess plant diseases where each plant is assigned a numerical value according to the percentage of leaf area showing disease symptoms. The Horsfall-Barratt scale was designed to compensate for human error in estimating the amount of disease present. The scale is as follows:
The scale is often used in modified form with index values from 0–11 or with different numbers of index points.
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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