Fundamental studies on production and utilization of edible canna.

1987年4月至1988年11月，在福波大学试验田栽培食用美人蕉（canna edulis Ker.）。根状茎（鲜重约200克）以0.5 × 1米的间距种植。在生长季共取样8次，测定了干物质生产的相关特征。实验结果如下：1)植后2周出苗，7月下旬至9月上旬因高温而生长旺盛。干物质积累持续到11月，达到2.1 kg/株。叶面积指数连续2个月保持在10以上，最大值为13.5。生物量生产力为42吨/公顷，根茎产量为17吨/公顷。吨/公顷。2)植株各器官间碳含量差异不大，但新发育部位氮含量高于老发育部位，植株累积氮含量为11 ~ 15 gN/株。从植物的碳氮比和干质量估计，氮的吸收量为270 kg/ha。3)光合作用和蒸腾作用在展叶后3 d达到最大值，表现为效率较低的太阳物种，对不同光环境具有适应性。4)对体重为45 kg的绵羊，每天用盐加水喂5.5 kg新鲜嫩枝，不影响其健康，饲用价值高。因此，如果在热带地区广泛种植，食用美人蕉比木薯更有用。

Edible canna (Canna edulis Ker.) was cultivated from April to November in 1987 and 1988 at the experimental field of University of Tsfukuba. Rhizomes (ca. 200 g of fresh weight) were planted at a spacing of 0.5 x 1 m. During the growing season, 8 samplings were made and characteristics related to dry matter production were estimated. The results were as follows; 1)Plants emerged two weeks after the planting but vigorous growth occurred during the late July to early September because of high temperature. Dry matter accumulation progressed until November and it attained at 2.1 kg/plant. Leaf area index was kept above 10 for two months and its maximum was 13.5.Biomass productivity was 42 t/ha and rhizome yield was 17.I t/ha. These were due to a good production structure of the crop community as high as 2.7 m. 2)Carbon content of plant was not largely different among plant organs, but nitrogen content was higher in newly developed parts than older parts and 11-15 gN/plant was accumulated. From C/N ratio and dry mass of plants, nitrogen absorption was estimated at 270 kg/ha. 3)Photosynthesis and transpiration were attained maxima three days after the leaf-unrolling and they were characterized to less efficient, sun species with an adaptability to diverse light environment. 4)Sheep with their weight of 45 kg were sustained by 5.5 kg/day of fresh shoots with salt and water, without diminishing their health, indicating a high feeding value. It is concluded that edible canna was more useful than cassava if it is widely cultivated in tropical regions.