8Eagle A J, Bird J A, Horwath W R, et al. Rice yield and nitrogen efficiency under alternative straw management practices. AgronJ, 2000, 92: 1096-1103.
9Wit C, Cassman K G, Olk D C, et al. Crop rotation and residue management effects on carbon sequestration, nitrogen eyeling and productivity of irrigated rice systems. Plant & Soil, 2000, 225: 263-278.
10Insam H, Mitehel C C, Dormaar J F. Relationship of soil microbial biomass and activity with fertilization and crop yield of three ultisols. Soil Biol Biochem, 1991, 23: 459-464.
