トマトの生育にともなう培養液濃度の推移と培養液管理方式の検討

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  • 蔬菜水耕栽培の実用化に関する研究 VIII : トマトの生育にともなう培養液濃度の推移と培養液管理方式の検討(農学部門)
  • トマト ノ セイイク ニ トモナウ バイヨウエキ ノウド ノ スイイ ト バイヨウエキ カンリ ホウシキ ノ ケントウ
  • Studies on production of vegetable crops in water culture VIII : Seasonal changes in nutrients concentrations in culture solution growing tomatoes as affected by solution renewal method (Agriculture)

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Abstract

Seasonal changes in nutrients concns in the culture soln as affected by the soln renewal method, was studied, on the tomato variety "Ohgata-Fukujyu" water-cultured in intermittently applied soln. Periodical replenishment of nutrient soln, which is one of the renewal methods commonly practiced in commercial water culture, was compared with the complete replacement. The amount of NO_3-N residue was analyzed every two weeks, and the soln was replenished with water and nutrients according to the amount of NO_3-N absorbed by the plant, assuming that the rate at which each nutrient element was absorbed was the same as it had been dissolved in the starting soln. The rates differed considerably with elements and growth stages, and therefore, after repeated replenishing, N, Ca and Mg became concentrated in the soln, while concns of P and K were lowered and often found nil in later stages. P and K contents of the plant and yield were lowered. Replenishing nutrient soln by analyzing solely NO_3-N residue is concluded inadequate to maintain a proper concn of each element in the nutrient soln.

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