6Dobermann AC,Witt C,Dawe D,et al.Sitc-specific nutrient management for intensive rice cropping systems in Asia[J].Field Crops Research,2002,74:37-66.
7Peng S,Buresh R J.Huang J L,et al.Strategies for overcoming low agronomic nitrogen use efficiency in irrigated rice systems in China[J].Field Crops Research,2006,96:37-47.