Uptake and Distribution of Inorganic Element in Tomato Grown by Hydroponics : 2. Changes in Concentration of Inorganic Elements in Culture Solution and in Plants with Growth

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  • 水耕栽培トマト中の無機元素濃度の経時変化
  • スイコウ サイバイ トマトチュウ ノ ムキ ゲンソ ノウド ノ ケイジ ヘンカ

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Abstract

Tomato plants (cv. TVR-2) grown by hydroponics were collected biweekly together with nutrient solutions for hydroponics, fractionated into leaf lamina, petiole, stem and fruit, and analyzed with regard to main nutrient elements in each fraction. The concentrations of K, P and Cl in nutrient solution, as well as those of K, P and N in vegetative organs, decreased with thickening and ripening of fruits, which went up to ca. 50% of the plant shoot in dry weight and required these elements as Mg, Ca and S to a lesser extent, and the concentrations of these elements in nutrient solution and in vegetative organs increased with the growth of the plant. The proportion of cations contained in the whole plant shoot kept virtually constant during the growth, regardless of a considerable change of cation composition in nutrient solution. In sharp contrast to cations, the proportion of anions in plant was significantly affected by the growth stage and by a change of anion composition in nutrient solution. Thus, the proportion of the nitrate ion rapidly decreased with the growth, accompanied by a simultaneous increase in the proportion of the sulfate ion. The leaf lamina and petiole were very different from each other in chemical composition, despite their close location in plant. This fact suggests that the leaves of tomato have to be divided into lamina and petiole prior to diagnostic analysis of the plant.

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