STUDIES ON CONTROLLED POTASSIUM FERTILIZERS : II. Evaluation of Potassium Silicates as Slow-release Sources of Potassium

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Three K silicates having SiO_2/K_2O ratios of 4,5,and 6 were compared with single and split applications of KCl, (KPO_3)_n, and sulfur-coated KCl (SCK-34) for their availability to four cuttings of common bermudagrass. At the rate of 200 mg of K/pot, all silicates applied in fine particles gave the same pattern of yield and K uptake as readily soluble KCl; however, less response to these finely sized K silicates at applications from 200 to 500 mg of K/pot suggests that they supply K more slowly than do soluble sources. K_2O・6SiO_2,when granulated in the size of 0.41-1.2 or 1.65-2.36 mm gave typical yield and K uptake patterns of slowrelease sources similar to those for SCK-34 at both rates of application. (KPO_3)_n supplied K in the same pattern as KCl and no effect of granulation was observed. A better balanced K supply through the whole period and the production of forage of more stable mineral composition is expected by the use of these slow-release K sources. Additional Index Words : slow-release potassium, potassium silicate.
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