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Fabrication of Mineral Coating for Slow-releasing Action and Characteristic  

Kim, Byoung-Gon (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Lee, Gye-Seung (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Park, Chong-Lyuck (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Jeon, Ho-Seok (Korea Institute of Geoscience and Mineral Resources (KIGAM))
Choi, Jong-Myung (Division of Hotriculture and Landscape Architecture, PaiChai University)
Kim, Lee-Yul (National Institute of Agricultural Science and Technology)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.40, no.5, 2007 , pp. 377-382 More about this Journal
Abstract
Porous mineral coating have been fabricated and applied for basic research on their slow release action to a fertilizer. Feldspar was selected as raw mineral for the coating and two different particle sizes of powder were prepared. Slow-release action was estimated by using a potassium sulfate fertilizer. Spherical pellets were prepared with a pan-type pelletizer and then screened into sizes ranging 1.4 to 2.35mm. While the fertilizer pellets were rotated in the pelletizer again, the feldspar powder and 0.5% polyvinyl alcohol solution were simultaneously sprayed on the pellets. The fertilizer pellets coated with feldspar powder were fabricated. The pellets were heated to increase their strength and screened to sort by coating thickness. Potassium releasing tests were conducted for 40 days and the performance for slow-release action was estimated as functions of the heating temperature, coating thickness and raw mineral powder size. The Burst effect caused high initial releasing rate. Releasing kinetics was proportional to concentration of potassium in pellets. The pellet that was fabricated with $27.4{\mu}m$-sized feldspar and heated at $1050^{\circ}C$ showed a releasing rate of 43% on the 40th day.
Keywords
Slow-release; Mineral coating; Pore; Releasing test; Fertilizer;
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