ジャガイモの種イモの節約栽培について(予報)

抄録

In this paper the possibility of saving potato seed tubers was examined. The three sizes of seed tubers were set up in this study : 1. the large seed tubers (tuber weight : 50-60g), 2. the small seed tubers (tuber weight : 2-3g, the rest of the tuber was cut off) and 3. sprouts only (no tuber was attached). Before transplanting in the field, the sprouts (the third treatment) were presubmerged in the 50ppm IAA solution during one day. All plots were transplanted at the same date. The results are as follows : 1. The larger the size of seed tubers, the earlier the shoot growth, resulting in the earlier tuberizaion and the larger tuber yield. 2. However, when the leaf area of the plants from the small seed tubers reached almost the same as that from the large seed tubers, the tuber bulking rates of both plants were almost equal. Therefore it may be necessary to hasten the leaf area development in the plants from the small seed tuber, not only to save the seed tuber but also to increase the tuber yield.