A Consideration upon the Adjustment of Yield of Tea Leaves:With Special Reference to the Maturity of Leaves

概要

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1. The yield of tea leaves was influenced by a slight variation of the plucking time, so, it does not show the correct value unless it is adjusted. 2. The yield was observed that it was closely correlated with the maturity (indicated by the ratio of bhanji shoot) and the number of shoots by a uniformity trial of sampling on the tea garden of the variety "Tamamidori". 3. The observed values of dry and fresh yield were adjusted by the maturity and number of shoots, both at mean and at the presumed best plucking time, as well as the effect of adjustment was tested by the reduction of variance or coefficient of variation of the sample. 4. The adjustment by the multiple regression of maturity and number of shoots proved more effective than by the single regression of each. The reduction of coefficient of variation by the adjustment is shown in the following table. From the result, the adjustment by the number of shoots was more effective, compared with each of the single regressions. However, some kinds of experiments may need not any adjustment by the number of shoots, or may need by other factors, but no case would be expected in which the yield would not be adjusted by the maturity 5. The estimated yield with its confidence limits at the presumed 'best plucking time was calculated, and this figure would be recognized the most reasonable value in this sample.
日本茶業技術協会の論文