5DORDAS C A,LITHOURGIDIS A S, MATSI T,et al. Application of liquid cattle manure and inorganic fertilizers affect dry matter, nitrogen accumulation, and partitioning in maize [ J ]. Nutr Cycl Agroecosyst, 2008,80:283 -296.
6PHONGPAN S,MOSIER A R. Effect of crop residue management on nitrogen dynamics and balance in a lowland rice cropping system [ J ]. Nutr Cycl Agroecosyst,2003, 66 : 133-142.
7WILLIAM R R,SOIL J B,JOHNSON G V,et al. Improving nitrogen use efficiency in cereal grain production with optical sensing and variable rate application [ J]. Agron J,2002,94:815-820.
8HOUBA V J G, NOVOZAMSKY I,HUYBREGTS A W M, et al. Comparison of soil extractions by 0.01 mol· L^-1 CaCl2 , by EUF and by some conventional extraction procedures [J].Plant and Soil, 1986,96:433-437.
9CHESHIRE M V,BEDROCK C N,WULLIAMS B L,et al. The immobilization of nitrogen by straw decomposition in soil [ J ]. Eur J Soil Sci, 1999,50:320-341.
10YADAV R L,DVIVEDI B S,PRASAD K,et al. Yield trends,and changes in soil organic-C and available NPK in a long-term ricewheat system under integrated use of manures and fertilizers [J]. Field Crops Research,2000,68:219-246.