The total length of shoots, the total number of leaves and the total fresh weight of shoots of one plant in the next year of transplanting were more in the plant having larger number of shoots than that having smaller one. But as to the mean length of shoots, the mean fresh weight of shoots and the weight of the heaviest shoot of one plant, a reverse relation to the above fact was observed.
The decrease of content of TAC in the woody roots of one plant from Apr. to Aug. was more in the plant having smaller number of shoots. And the accumulation of TAC in the woody roots from Aug. to Nov. was less in that plant in the year of transplantation.

View full abstract

[in Japanese]

View full abstract

In experiment I, the optimum nitrogen fertility of tea field soils for tea plants was investigated using three kinds of nitrogen fertility fields of 12, 24 and 36 mg per 100g of dry soil in autumn to the 3rd crop season of next year except winter.
In experiment II, each optimum nitrogen fertility of soils in the autumn and spring season for tea plants of the 1st crop was investigated using several nitrogen fertility fields.
1. Over 24 mg nitrogen fertility, the yield, total nitrogen contents of green leaves and qualities of green tea were better than those of usually manured plants.
2. The optimum nitrogen fertility to the 2nd and 3rd crop was N-36 mg and it was higher than N-24mg of that to the 1st crop.
3. The amount of absorbed nitrogen in new leaves of the 1st crop was more increased by raising fertility in spring than in autumn.
About the qualities of green tea, we obtained the same result as the above one.
4. By raising nitrogen fertility in spring to 24 mg total nitrogen contents of old leaves decreased gradually with the growth of new shoots of the 1st crop and tannin contents of new leaves of the 1st crop also decreased.
5. The conclusion is that the seasonable optimum nitrogen concentration in tea fields is about 12mg per 100g dry soil in autumn, about 22mg in spring and about 30 mg in summer, respectively.

View full abstract

[in Japanese]

View full abstract

Calluses were induced from stem segments of young tea shoot on Murashige & Skoog's medium containing 3% sucrose, 0.8% agar, 10^-6M 2, 4-D and 10^-5M kinetin. These calluses were incubated at 24°C, 28°C and 32°C under dark respectively. Growth of calluses were accelerated more at 32°C than at other two temperature conditions. So, it was cleared that the optimum temperature for the growth of calluses was higher than 28°C. And the temperature 32°C was included in the range of suitable temperature for callus growth.

View full abstract

Boron content of mature leaf sampled in winter was investigated for 26 plants of 2 varieties of tea plant (Camellia sinensis (L.) O. Kuntze). The boron content of C. sinensis var. assamica was greater than that of C. sinensis var. sinensis and there was a difference in that between the Chinese plants and the Japanese plants both belonging to var. sinensis.
Mean and range of boron content were 29.9 ppm and 28 ppm for var. assamica, 23.0 ppm and 11 ppm for Chinese plants and 22.3 ppm and 6.5 ppm for Japanese plants, respectively. C. sinenis var. assamica was characterized by its high boron content and wide variation as compared with var. sinensis.

View full abstract