7[1]Alva A. K. Differential leaching of nutrients from soluble vs. controlled-release fertilizers. Environment Management,1992,16:769～776
8[2]Inahara M. ,Matsumoto M. Single basal fertilization of rice cultivars using sigmoidal formulation of controlled release fertilizer in a coarse-tex tured paddy field (In Japanese) Ann. Report of soil and fertilizer studies. Soil and Fertilizer Division. Toyama Pref. Agrotechnology Center.1993～ 1996
9[3]Maeda S. Studies on coated fertilizers. Ph. D thesis. Faculty of Biological Production,Hiroshima University, 1990
10[4]Osaki M. , Shinano T. ,Tadano T. Productivity of high-yielding crops. Soil Sci. Plant Nutr. , 1991,37: 331 ～ 339
