窒素肥料の組み合わせがサツマイモの地上部生育相ならびに塊根の着生および発育に及ぼす影響

概要

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Wooden frame experiments were carried out to clarify the suitable combination of nitrogenous dertilizer between the basic fertilizer and the side-fressing upon the tuber-formation and tuber-thickening growth in sweet potato. Four types of soil were used.1. In spite of the differences of soil used, tuber yield at the plot of NH4NO3+(NH4)2SO4 was the highest among the following three treatments, that is, NH4NO3+(NH4)2SO4, NH4NO3+CO(NH2)2, and NH4•NO3+NH4NO3.2. In the plot of NH4NO3+(NH4)2SO4, it was more unfavourable to tuber-formation than other treatments owing to the considerable elongation of vines during the tuber-formation stage from the middle of July to the middle of August. On the other hand, yield of tubers at the plot of NH4NO3+(NH4)2SO4 was increased, especially that of large tubers, as it was favourable to the accumulation of assimilation nutrients owing to the vigorous vine growth during the tuber-thickening period.3. From the results of this investigation, it is evident that dry matter content of tubers at the plot of NH4NO3+(NH4)2SO4 was the highest among these treatments in the light soil, that is, sand to loam, with the exception of clayey loam, in which it was rather low.
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