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A complementary method to keep a speaker and microphones vertical for determining the sound pressure level di erence was proposed to determine the e ective ow resistivities of several ground states. The method could be well applied to at ground and the sound pressure level di erences measured had less scattering than those obtained by using the ordinary method which kept the speaker and the microphones horizontal. The ow resistivity of a cabbage farm was newly estimated as 200 cgs rayls. In the case of a rice plant, we estimated a ow resisitivity of 2 cgs rayls with the new analysis.


A complementary method to keep a speaker and microphones vertical for determining the sound pressure level di erence was proposed to determine the e ective ow resistivities of several ground states. The method could be well applied to at ground and the sound pressure level di erences measured had less scattering than those obtained by using the ordinary method which kept the speaker and the microphones horizontal. The ow resistivity of a cabbage farm was newly estimated as 200 cgs rayls. In the case of a rice plant, we estimated a ow resisitivity of 2 cgs rayls with the new analysis.