Studies on the Frost Damage on the Tea Plant (Part 3):On the Prevention of Frost Damage by the Wind Blast

概要

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1. In order to prevent the frost damage of the tea plant, a wind machine was manufactured in 1956, and.the variation of temperature and relative humidity of the atmosphere near the ground on the tea garden and the destruction of inversion layer by the intermittent blowing were researched in 1957-1958.<BR>2. The temperature effect (the difference of temperature variation between the blown and not blown places) was differed with the temperature gradient of inversion layer.<BR>Namely, the sharper the gradient the more remarkable the effect but it was required a powerful energy to destruct the inversion layer, consequently, the temperature effect was confined in a narrow field. The temperature effect was more effective when used together with the heaters.<BR>3. The saturated vapor near the ground was agitated and the relative humidity was reduced by the wind blast. Accordingly the amount of dew on, the tea garden was decreased. If the cold damage becomes severe by the frost, these effects by the wind blast are very effective to prevent the damage together with that of the temperature elevation by destructing the inversion layer.<BR>4. Relation between the intermittent wind blast and the reformation of inversion layer was researched, as the result of it, the temperature effect disappeared in 9 minutes after the wind blast was stopped.
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