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KMID : 0903619920330030244
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Journal of the Korean Society for Horticultural Science
1992 Volume.33 No. 3 p.244 ~ p.251
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Effects of Nitrogen , Potassium Levels and their Interaction on the Growth and Development of Hydroponically Grown Tomato
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Abstract
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This experiments were carried out to investigate the optimum levels of nitrogen and potassium and its interaction of nutrient solution with the changing patterns of vegetative and reproductive growth of hydroponically grown tomato.
Nitrogen and potassium levels of nutrient solution were 2, 4, 8, 16, 32 me N/ℓ and 1, 2, 4, 8, 16 me K/ℓ. Third-true-leaf-aged tomato plants were treated with each N, K levels and grown in plastic container(601) filled with nutrient solutions and aerated to ensure adquate root oxygenation. Plant height was increased with the increment of both nitrogen and potassium treated, but in high concentration(36 me N/L, I6 me K/ℓ) it was observed non-significant. Especially plant height and leaf area were more sensitive to the potassium than that of nitrogen in the nutrient solution. Top/root ratio increased with the increment of nitrogen and flowering response was heighest in the level of 8 me N/ℓ. Fruit fresh weight increased with the increment of nitrogen levels and the same responses have shown in the setting ratio per cluster and average fruit fresh weight, however the effectiveness of increasing fruit dry weight as affected by potassium levels was less than that of nitrogen of nutrient solution.
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