6Duda G G.Use of simplex-lattice design techniques to determine optimum distribution of fertilizers between times of their application[J].Fert Res,1992,31:193-207.
7Harafi M M,Eltaib S M,Ahmad M B,et al.Evaluation of controlled-release compound fertilizers in soil[J].Commun Soil Sci Plant Anal,2002,33(7-8):1139-1156.
8Huett D O,Gogel B J.Longevities and nitrogen,phosphorus and potassium release patterns of polymer-coated controlled-release fertilizers at 30 ℃ and 40 ℃[J].Commun Soil Sci Plant Anal,2000,31(7,8):959-973.
9Hara Y.Application of the Richards function to nitrogen release from coated urea at a constant temperature and relationships among the calculated parameters[J].Soil Sci Plant Nutr,2000,46(3):683-691.
10Hara Y.Application of parameterization using the Richards function to nitrogen release from coated urea and growth of rice seeds[J].Japan Agric Res,2001,35(3):155-161.