傾斜地に於ける甘藷の直播栽培について (予報)

抄録

This experiment was carried out from May to November, 1951, and 6 typical varieties of sweet potato in this region were used. The results were summarized as follows : 1) We set up two plots, transplanting and non-transplanting (direct planting). In the former 3200 sprouts and in the latter 1800 seed tubers (each. tuber is about 70 to 75 gr) were planted per tan. 2) The yield of the total root tubers (including old seed tuber) in the nontransplanting was higher than that of transplanting plot, and Kanto 22 variety was the highest in the non-transplanting plot. 3) As regards to the average number of sprouts per seed tuber in the direct planting plot, Nourin No. 1 variety was the biggest and Nourin No. 6 was the least. 4) Generally speaking ; the palatability of newly developed root tuber in the non-transplanting plot is better than that of old seed tuber, and concerning the specific gravity of root tuber at harvest in the non-transplanting plot the new ones are bigger than old ones. 5) In Okinawa No. 100 and Norin No. 1 varieties of the non-transplanting plot, the size of old deed tuber which, had became bigger had the tendency of getting cavity or malformation.