キュウリの閉鎖型ロックウール栽培における培地栄養成分の変化

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  • Changes in Nutrient Levels in Solutions Used for a Closed System of Rockwool Hydroponics of Cucumber Plants.
  • キュウリ ノ ヘイサガタ ロックウール サイバイ ニ オケル バイチ エイヨウ セイブン ノ ヘンカ

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Cucumber plants were grown in a closed system of rockwool hydroponics. Nutrient solutions were supplied at constant volume at three different nitrogen levels (4, 13, and 22 me·liter-1). Phosphate, potassium, calcium and magnesium levels in the solution were 3, 6, 7 and 4me·liter-1, respectively.<BR>At the low nitrogen level, plant growth was delayed and concentrations of elements in leaves were low. At the intermediate nitrogen level plant growth and yields were the best, while at the high nitrogen level they were low compared with the lower nitrogen level.<BR>At the intermediate nitrogen level, accumulation of nitrogen in the nutrient solution occurred slightly only at the last growth stage. At the high nitrogen level, its accumulation occurred intensively from the middle growth stage onwards. With both levels, accumulation of other elements was not different; accumulation of calcium, magnesium and potassium occurred from the first stage, from the middle stage and at the last stage, respectively. Phosphate concentrations in the nutrient solution were almost zero after the first harvest.<BR>Foliage nitrogen concentrations 50 days after transplantation were high only on the upper nodes of plants grown at the intermediate nitrogen level but both on the middle and upper nodes at the high level. Phosphate contents were correlated with the nitrogen levels in the nutrient solutions and increased in leaves on the more upper nodes as well. However, calcium and magnesium contents decreased in the leaves on the upper nodes, and they were also lower at the high nitrogen level in accordance with their accumulation in the nutrient solution. Potassium contents showed a similar trend to that of calcium in leaves on the middle and upper nodes. These findings revealed that for the closed hydroponics system the nutritional balance in the nutrient solution must be changed for different growth stages.

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