Zeolite and Hucalcia as Coating Material for Improving Quality of NPK Fertilizer in Costal Sandy Soil - Sulakhudin, .; Department of Soil Science, Faculty of Agriculture, Gadjah Mada University, Bulaksumur Campuss, Flora Street No 1, Bulaksumur, Yogyakarta 55281 Indonesia (UNIVERSITY OF LAMPUNG, 2011)