ON THE "METSUBURE" SYMPTOMS OF TARO CORMS : II. The Effects of Potassium Application on the"Metsubure"Corm Formation of Taro

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Field experiments with the"Taikichi"taro cultivar were conducted in volcanic ash soil of Kagoshima Prefecture, Japan, in order to determine the effects of potassium applied with fertilizers and manures on the growth and yield of taro. The experimental design was according to the L27(3^<13>)orthogonal factorial experiment, the three factors selected being the manures, nitrogen fertilizers and amount of potassium application. "Metsubure"corm formation was infrequent in hog manured plots without potassium application, but was significantly increased by the application of potassium fertilizer. Furthermore, the occurrence of"Metsubure"corms was significantly lower in fields prepared with hog manure than in those prepared with plant residue and cattle manure. Chemical analysis of the taro plants and manures revealed that the plants absorbed much more calcium when planted in hog manure than in other manures. The CaO/K_2O ratio was also higher. The main reason for this was assumed to be the lower content of potassium in the hog manure (0.37%K_2O on a dry basis). The analytic results suggest that potassium disturbs the calcium uptake ability of the taro plant causing"Metsubure"corm formation. The authors also attempted to determine the effects of several kinds of nitrogen fertilizers on"Metsubure"corm formation, but no clear results were obtained in this experiment.
社団法人日本土壌肥料学会の論文