Abstract
Entomologists are frequently confronted with the task of estimating the area of the canopy of a crop to determine the degree of interception of insecticides, pathogens, and other biological agents when the control agents are applied aerially. These data are also necessary for estimates of the shading of the soil surface when models are to be used to predict the temperatures of the soil surface and the upper subterranean strata from more easily measured parameters such as air temperature, shading, cloud cover, solar radiation, and other factors associated with the coefficient of diffusivity of soil (K. Foster, Research Associate, and R. E. Fye, unpublished data). The results of a preliminary study to determine means of estimating the canopy coverage of cotton are discussed here.
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