Growth Promoting Effect of Gibberellin upon the Tea Shoot (Continued)

概要

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In 1959, the experiment was designed by combining the gibberellin spraying and manuring, and each plot was given with the same treatment through all plucking seasons. The results of experiment were as follows: the growth rate of tea shoot sprayed with gibberellin was faster, and in 1st, 2nd, and 3rd plucking seasons the amount of growth per day were 3.9, 3.9, 6.3 mm. in the sprayed plots and 2.5, 2.2, 3.5 mm. in the unsprayed plots respectively. The number of shoot and number of leaf were not affected by gibberellin spraying, and both the sprayed and unsprayed shoot increased one leaf in 5 days in 1st season, 4 days in 2nd season and 3 days in 3rd season. The yield and weight of shoot were larger in the sprayed plots and the former of whole shoot and of P+3L showed an increase of 8% and 5% over the unsprayed plots. Of the chemical constituents, chlorophyll was reduced which coincided with the results of the preceding experiments, but total nitrogen, caffeine, tannin, and crude fibre contents showed no significant difference between the sprayed and the unsprayed. The qualities of black tea made with the sprayed leaves were better than those of the unsprayed, but the increase of the plucking cycle in a year could not be expected.
日本茶業技術協会の論文