ABSTRACT
The only published information on the effect of crops on sound propagation is that collected by Aylor [1] over maize and hemlock. In discussing his data, Aylor concentrated on the extra attenuation of sound at higher frequencies associated with the presence of crops, rather than on their influence on ground effect. In section 10.2 we discuss these data for higher frequency (>1 kHz) attenuation of sound through crops. In this section we demonstrate, on the basis of measurements at fairly short ranges, that the presence of plants appears to disturb the ground effect (<1 kHz).
