Effects of Transplant Raising Method on Growth and Tuber Yield of Potato Grown in Aeroponics System

摘要

This study was carried out to find out the best methods of raising transplants and to evaluate the possibility of reducing incidence of basal stem rot caused by Pythium myriotylum and of easiness for seed tuber production of potatoes (Solanum tubersumL.) grown in aeroponics system. Incidence of basal stem rot, growth and yield of transplants raised from stem cutting, non-rooted cutting, non-rooted cutting with a wick, deep flow rooted cutting, and rooted mini tuber were evaluated in a spring seasonof 2002. Potato basal stem rot occurred 11% in transplants raised from stem cutting but did not occur in the other transplants. Stem length averaged about 60.0 cm except for transplants raised from stem cutting with 48.3 cm. Transplants raised from deepflow rooted cutting had the heaviest root dry weight, 33.2 g per plant, followed by those from rooted mini tuber. The number of first stolons per plant was greatest as twelve stolons for transplants raised from deep flow stem cutting and rooted mini tuber. Transplants raised from deep flow stem cutting had 773 total tubers and 491 tubers over 5 g per m2, which is the greatest among the treatments. Transplants raised from rooted mini tuber was ranked second for the number of total tubers and tubers over5 g. Transplants raised from stem cutting produced fewest tubers over 5 g, that is 255 tubers per m , but the highest number of tubers weighing 5 g or less, that is 365 tubers per m'. These results indicate that raising transplants from deep flow stem cutting could be best considering basal stem rot incidence and tuber yield of potatoes grown in aeroponics system.