DEW IN THE MISSISSIPPI DELTA IN THE FALL

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Abstract
Dew, which affects many agricultural crops in many different ways, affects the quality of harvested cotton in the Mississippi Delta. For this reason, a study of dew in this area was made. Dew was measured by collectors patterned after the Duvdevani dew block. Vertical variation was observed at 10 levels above the ground from 3 to 72 in. Dew intensities normally decrease with height. The rate of change was larger below 24 in. than above. Area variation at the 24-in. level was measured at five Delta locations. Differences in dew intensity were less between stations 40 mi. apart than between stations 150 mi. apart. Vertical variation of dew, expecially below 24 in., appears to be a micrometeorological phenomenon and thus not subject to conventional forecast techniques. Areal variation of dew at the 24-in. level appears to be a macrometeorological phenomenon which is subject to conventional forecast techniques.

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