Method of the Liming Material Application to Minimize "Metsubure" Corm Formation in Taro

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  • 石灰施用によるサトイモの芽つぶれ症対策
  • セッカイ セヨウ ニ ヨル サトイモ ノ メツブレショウ タイサク

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Mother, daughter and secondary corms are formed one by one in the course of taro growth, usually having an infant bud on the top of each corm. So-called "Metsubure" corms are formed with the top of the corm smooth or concave. It is confirmed that "Metsubure"symptom is a physiological disorder caused mainly by calcium deficiency. However, the effective fertilization technique for field culturing is not yet established. The authors therefore investigated the course of "Metsubure" corm formation and the method of liming material application in order to find out its technique. The results obtained were as follows. 1) "Metsubure" corms were first found about the beginning of July when secondary corms began to be formed. The number of "Metsubure" corms was remarkable increased from the middle of August when the growth of secondary corms developed. This number was more than 95% of total "Metsubure" corms at the harvesting age in 1982. 2) Calcium content in "Metsubure" corms tended to be lower than that in normal corms. Conversely, potassium content in "Metsubure" contended to be higher. 3) The least "Metsubure" corms were obtained by the heavy application of calcium. The number of "Metsubure" was significantly increased by the heavy application of compost. But both a serious decrease in "Metsubure" corms and a gradual increase in yield were obtained without potassium application or with the heavy application of calcium fertilizer. 4) It was considered that more exchangeable Ca than 10 cmol(+)kg^<-1> in topsoil at taro planting was required for reducing the occurrence of "Metsubure" corms without the topdressing of liming material. 5) Both the least "Metsubure" corms and best yields were obtained by the topdressing of liming material with the full sprinkling.

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