Abstract
Wind and radiation profile theory, along with weather station data on temperature, humidity, wind and incoming radiation, have been used to estimate in-canopy microclimate sufficiently well for use in a droplet drying model. This model is an adaptation of the Penman combination equation which calculates the evaporation rate of slow-drying droplets from heat and mass transfer theory for hemispheroids. For 38 of the 54 drops studied on deep-canopy corn leaves, differences between modelled and measured wetness duration were within 14% (25 min) of the actual wetness duration, with the modelled durations usually slightly longer than the observed durations. Other crops dried more quickly than predicted because they deviated from model droplet behaviour, which is designed to estimate maximum wetness duration for use in disease management decisions.
Published Version
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