Studies on the Ecotype of the Genus Dioscorea : II. Effect of seed tubers on the yield of Dioscorea esculenta BURK. var. spinoa PRAIN et BURK (Research Institute of Tropical Agriculture)

この研究は, タマゴイモのタネイモとして, 大イモと小イモを供試し, 両者の間に収量等について, どのような差異があるかについて, 1980年琉大熱帯農研において行なわれたものである。1大タネイモの大イモ個数とイモ生重量地上部生重量とイモ生重量および茎数に5%レベルで有意差が認められた。地上部生重量とイモ生重量の相関係数はr=0.70である。2小タネイモの大イモ個数と小イモの個数, 小イモ生重量, 茎数の間に, 小イモの個数と茎数の間に, また茎数と地上部生重量の間に5%レベルで有意差が認められた。地上部生重量とイモ生重量の相関係数はr=0.93である。3大タネイモおよび小タネイモの地上部生重量とイモ生重量の間に5%レベルで有意差が認められた。4大タネイモと小タネイモのイモ生重量の間に有意差は認められなかった。また両者の地上部生重量についても同様の結果が得られた。5大イモと小イモのタネイモによる収量の有意差は認められなかった。したがって大イモは食用に小イモはタネイモ用に供した方が得策である。1. This study was carried out of the effect on the yield of Dioacorea esculenta using by diffrent weight of seed tubbers, in the Research Institute of Tropical Agricuture, University of the Ryukyus, Iriomote, Okinawa. The result obtained are summarized as fallows; 2. Number of the large tuber, top of the fresh weight, tuber of the fresh weight and number of the stem had recoginized 5% of significance respectively as planted large seed tuber. Correlation as recoginized 0.70 between the fresh weight of top and the fresh weight of tuber. 3. Number of the large tuber, number of the small tuber, fresh weight of the small tuber and number of the stem, number of the small tuber and number of the stem, top of the fresh weight and number of the stem had recoginized 5% of significance reapectively as planted small seed tuber. Correlation was recoginized 0.93 between the frsh weight of top and the fresh weight of tuber. 4. Between the top of fresh weight and the tuber of fresh weight had recoginized 5% of significance as planted each seed tuber large and small. 5. Yield of fresh weight of the tuber, between the large seed tuber and the small seed tuber had not recoginized of significance. Also, about the top of fresh weight get the same result. 6. Diffrent of seed tuber between the large and small had not significance for the yield of tuber. Therfor, it is advisable to use, that large tuber for food and small tuber for seed