|発明の名称||DETECTION OF DENSITY OF SOIL ORGANISM|
PROBLEM TO BE SOLVED: To readily obtain precise nematode density distribution in a short time.
SOLUTION: Natural electric potential of a field 3 is measured by a natural electric potential measuring device 2 in a first process to prepare electric potential distribution in the field 3. At the point at which natural electric potential exhibits different value among the natural electric potential distribution obtained by the first process, soil is collected in a second process. Then, ground density of root lesion nematode is measured from soil obtained by the second process and correlation between the measured density and natural electric potential at the collected point is judged in a third process. The density of soil organism of the field 3 is detected correspondingly to natural electric potential obtained by the first process based on the correlation between soil organism density and natural electric potential judged by the third process in a fourth process.
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