The Relationship between Growth and K/(Ca+Mg) Ratio in a Forage Sugarcane Variety, KRFo93-1

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  • 飼料用サトウキビＫＲＦｏ９３－１の生育とＫ／（Ｃａ＋Ｍｇ）当量比の関係
  • シリョウヨウ サトウキビ KRFo93-1 ノ セイイク ト K/(Ca+Mg)トウリョウヒ ノ カンケイ

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The relationship between growth and mineral balance shown by the K/(Ca+Mg) ratio of plant shoot was studied in a forage sugarcane variety, KRFo93-1. The degree of growth was evaluated by dry-matter weight per stool. In Exp.1, the phenological change of the K/(Ca+Mg) ratio in plant cane, and in Exp.2, the K/(Ca+Mg) ratio after different periods of growth were studied. The soil mineral contents such as exchangeable K, Ca and Mg were adequate in both Exps. In Exp.1, the concentrations of shoot K, Mg and K/(Ca+Mg) ratio decreased significantly with growth. There was a significant negative correlation between dry matter weight and K/(Ca+Mg) ratio. This negative correlation was also shown in Exp.2. The K/(Ca+Mg) ratio did not exceed the known upper limit of K/(Ca+Mg) ratio of 2.2. These results indicated that the K/(Ca+Mg) ratio of plant shoot was improved with growth under adequate soil mineral condition.

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