Effect of Nitrogen Content of Seed Corm on Growth and Yield of Konjak Plant (Amorphophallus konjac K. Koch)

Abstract

Konjak plants (cv. Zairai) were grown in pots using 2-year-old seed corms of 75 g in weight, containing different amount of nitrogen. The leaf area, dry weight and amount of nitrogen absorption were measured at 35, 65, 95 and 140 days after planting. The plants grown from the seed corms with high nitrogen (N, 0.44 g/corm) had larger leaf area and dry weight of leaf, root, new corm and total plant at all growing times and absorbed larger amount of nitrogen than those from the seed corms with low nitrogen (N, 0.29 g/corm). Especially, remarkable differences were found in root number, dry weigth of root and in nitrogen content at 35 and 65 days after planting.