Studies on Matter Production of Edible Canna (Canna edulis Ker.) : II. Changes of dry matter production with growth

[摘要] Edible canna was grown for three successive seasons from late April to early to mid-November under field conditions to clarify the basis of its productivity in the temperate climate of Japan. The growth of the aerial part of the plant was substantially accelerated by the hot weather from mid-July to late August, and the plant grew up to 2.7∼2.8 m in height. It grew 20∼22 leaves on its main stem, and 9∼19 shoots with 29∼35 newly formed rhizomes. Edible canna maintained a high leaf area index (LAI, ca. >9) for about 2 months from late August to early November with a maximum of 11.5∼12.7. Accumulation of dry matter to newly formed rhizomes began in mid-August and continued until the final harvest in November, when frost damage occurred. The final dry weight of the whole plant was 2578∼3968 gm-2 and that of rhizome was 954∼1644 gm-2 so that the harvest index range was as low as 0.37∼0.43. The mean crop growth rate (CGR) was 12.7∼19.3 gm-2 d-1 and interestingly, the maximum CGR (35.3∼43.6 gm-2 d-1) occurred from mid-September to early October in 2 of the 3 years. A tall stand of edible canna population has a high potential productivity based on its high LAI during the latter half of ontogenesis.

[学科分类] 农业科学（综合）

[关键词] Canna edulis Ker.;Crop growth rate;乾物生産;Dry matter production;個体群生長速度;Edible canna;収穫指数;Growth;純同化率;Harvest index;食用カンナ;Leaf area index;葉面積指数.;Net assimilation rate.