Reference of the Cover Material for Frost Protection in the Tea Field

概要

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To save the frost damage several materials were examined by direct covering on the tea bush.<BR>Many kinds of cover material (film type : 5, mat type 9, clothe type : 3, etc) were tested with regard to warm keeping ability on the tea bush surface and the tea leaves.<BR>From the result of investigation, polyuretanfoam, BB-tex and lawn with close texture were observed to be effective. Generally direct covering was inferior to indirect covering (covering height was above 50 cm. over the tea bush surface) in keeping warm, so the material for direct covering was required to be inconductive of heat and to be thick somewhat.<BR>On the prevention of frost damage by covering the degree of keeping warm was correlated to the degree of thermal inversion and the air temperature near by the tea bush surface.<BR>The more the degree of thermal inversion and the lower the air temperature just above the tea bush surface, the larger the warm keeping ability. These facts were very favourable for preventing frost damage.
日本茶業技術協会の論文