Studies on Increasing of Frost Hardiness to the Tea Shoots

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Some protecting methods of frost injury were examined by increasing the frost hardiness of tea shoot with sugars, urea and polyols.<BR>By absorbing the solutions of chemicals through the stem of cutting tea shoot, ethyleneglycol, propyleneglycol, glycerol, glucose and saccharose promoted the hardiness of tea shoot but urea did not show the effect. The efficacy of increasing hardiness was in the following order, i. e., polyols, saccharose, and glucose, but propyleneglycol and ethyleneglycol occurred chemical iniurv.<BR>By foliar spraying, polyols and glucose were effective but saccharose was not. The reason why the latter was ineffective was presumed to be the low permeability through the cell wall owing to its large molecule.<BR>The foliar sprayings of glucose and glycerol on the tea field had no effect on the yield and the qualities of tea.
日本茶業技術協会の論文