サトイモ栽培における種イモとしての親いも利用が生育・収量に及ぼす影響

Abstract

The utilization of the mother corm (M seed corms) as a seed corm in the taro cultivation was investigated by making comparisons with the growth and yield of standard seed corms derived from a daughter corm (D seed corm).1) On the high morbidity of the M seed corms, there was hardly a problem by removing the contraction corms, and disinfecting the M seed corm before the laying-in of the corms.2) The plots of both the M seed corm and the D seed corm sprouted within 10 days after planting. The growth in the early stage of the M seed corm plot was greater than in the D seed corm plot, and the leaf color was dark green. The shoot die back in the M seed corm plot was one week earlier than in the D seed corm plot.3) Starting time in which the number of the unfolding leaves in each plot reached the maximum, new corms were formed by thickening the lower part of the main stem, and the fresh weight of the corm increased. After that, the daughter corm, the secondary corm and the 3rd corm were formed and thickened. In the M seed corm plot, many “Kogashira” daughter corms with leaves, were formed as compared with the D seed corm plot.4) The yield of the M seed corm plot was about 3 times higher than that of the D seed corm plot, because the weight of each daughter corm and secondary corm was higher in the M seed corm plot than in the D seed corm plot.5) From these results, we conclude that the M seed corms are useful as a seed corm source.