Modeling of the Developmental Process of Lateral Buds after Skiffing in Tea Plants

Japanese Journal of Crop Science

Takayuki NAKANO¹ 

关键词: Camellia sinensis L.;    開葉;    Developmental index;    整枝;    Developmental rate;    側芽;    Growth model;    チャ;    Lateral bud;    発育指数;    Leaf opening;    発育速度;    Skiffing;    発育モデル;    Tea plants;   

DOI  :  10.1626/jcs.68.433

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In perennial crops such as woody plants, a big problem has been how to fix an initial day for a growth period to an appearance day of the objective character in a growth model by using meteorological factors. In tea plants, mature shoots with many leaves have a lateral bud at each leaf axil. Several investigations have shown that a skiffing operation, which means cutting shoots, promoted the growth of the top lateral bud. It suggested that a skiffing day could be considered an initial day. About 120 growth data obtained by skiffings from autumn of 1993 to spring of 1997 for two tea varieties of Yabukita and Okuhikari were analyzed. A growth period from the skiffing to the opening time of the first leaf was observed to be shortened by skiffings from spring to summer, but it would be lengthened by skiffings from autumn to winter. In the growth model, a skiffing time and an opening time of the first leaf were assumed as a Developmental Index (DVI) =0 and DVE=1, respectively. The Developmental Rate (DVR), which means an increment of DVI a day, was found by the following function : DVR=a/[1+exp {-b (T-c)}] / [1+exp {-d (D-e)}] where a, b, c, d, and e are parameters, T is mean average air temperature, and D is day length. Their functions were checked concerning their adaptability as the DVR and concluded to be a reasonable function to estimate the DVR of lateral buds.

【 授权许可】

Unknown