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KMID : 0903620000410050480
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Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 5 p.480 ~ p.484
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Effects of Potassium Silicate on Growth , Photosynthesis , and Inorganic Ion Absorption in Cucumber Hydroponics
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Abstract
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Application methods included amending nutrient solutions to concentrations of 0.85 mM, 1.7 mM and 3.4 mM Si and foliar sprays of 17 mM Si. Cucumber plants, cv. Eunsungbackdadagi, were grown in recirculating nutrient solutions containing SiO₂ which was the level present in the water supply or providing an additional SiO₂. Silicate concentration in nutrient solutions was decreased as the cucumber plants grow up, which indicated that the cucumber plants selectively absorbed silicate. Cucumber plants grown in low Si concentrations ($lt;0.8 mM) absorbed remarkably lower amount of silicate compared with the amount absorbed by plants in high Si concentration. High silicate concentration treatment induced production of darker green leaves, and enhanced photosynthesis capacity of leaves and resulted in shorter petioles, increased amount of fresh weight, higher chlorophyll content, higher RuBPCase activity, and higher soluble protein content. The silicate absorbed from nutrient solutions translocated into the 6th node above cotyledons of cucumber plants was as much as 3 times higher than in 6th node below apex. The accumulated silicate enhanced the rigidity of mature leaves, and prevented leaf senescence as much as 4 times than in the leaves of under part compared to the leaves of non-treated cucumber plants. The P contents in leaves of cucumber plants cultivated in silicate-containing medium were 0.8% and 1.2% at 1.7 mM and 3.4 mM concentrations of silicate, respectively, while the content was 0.5% in cucumber leaves of non-treated. In regard to the experiments with cucumber, the results were due to an interplay between Zn, P, and Si and an alliviation by Si of nutrient imbalances.
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