Abstract
By the assumption that both soil moisture and soil air affect plant growth as linear factor, the relationship between mean plant dry weight and soil moisture content was newly formulated. Its applicability to actual growth data was tested by growing three species ofBidens under different levels of soil moisture content. The growth data ofBidens well satisfied the new formula. The optimum soil moisture content giving a maximum mean plant dry weight was the largest inB. frondosa and the smallest inB. biternata. This result well agreed with field observations. The growth factor represented by the new formula was referred to as “repulsive factor”, and the difference between the repulsive factor and optimum factor was discussed.
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