REFERENCES
- Bremner, J.M., and C.S. Mulvaney. 1982. Nitrogen-total. In: Methods of Soil Analysis, eds. A.L. Page, R.A. Miller, and D.R. Keeney, pp 595–624. Madison, WI: American Society Agronomy.
- Cassman, K.G., S. Peng, D.C. Olk, J.K. Ladha, W. Reichardt, A. Dobermann, and U. Singh. 1998. Opportunities for increased nitrogen-use efficiency from improved resource management in irrigated rice systems. Field Crops Research 56: 7–39.
- Chen, G., M.Y. Li, Q.H. Shi, X.H. Pan, and X.M. Tan. 2011. Effect of nitrogen application on population development and grain yield of direct-seeded rice. Crops 1: 33–37.
- Dawe, D. 2005. Increasing water productivity in rice-based systems in Asia–past trends: Current problems, and future prospects. Plant Production Science 8: 221–230.
- De Datta, S.K. 1986. Technology development and the spread of direct-seeded flooded rice in Southeast Asia. Experimental Agriculture 22: 417–426.
- De Datta, S.K., I.R. P. Fillery, and J.R. Simpson. 1986. Contribution of ammonia volatilization to total nitrogen loss after applications of urea to wetland rice fields. Nutrient Cycling in Agroecosystems 8: 193–202.
- De Datta, S.K., and P. Nantasomsaran. 1991. Status and prospects of direct seeded flooded rice in tropical Asia. In: Direct Seeded Flooded Rice in the Tropics: Selected Papers from the International Rice Research Conference, pp. 1–16. Manila, Philippines: International Rice Research Institute.
- Fageria, N., O. de Morais, and A. dos Santos. 2010. Nitrogen use efficiency in upland rice genotypes. Journal of Plant Nutrition 33: 1696–1711.
- Ishizuka, Y., and A. Tanaka. 1953. Studies on the developmental processes in rice plants. Journal of the Science of Soil and Manure, Japan 23: 159–165.
- Jiang, L., T. Dai, D. Jiang, W. Cao, X. Gan, and S. Wei. 2004a. Characterizing physiological N-use efficiency as influenced by nitrogen management in three rice cultivars. Field Crops Research 88: 239–250.
- Jiang, L., X. Gan, S. Wei, J. Xu, and W. Cao. 2004b. Accumulation pattern of dry matter, nitrogen, phosphorus, potassium and silicon in rice genotypes and their relationships. The Journal of Applied Ecology 15: 226–230 ( in Chinese with English abstract).
- Lin, Q.H. 2000. Crop Population Quality. Shanghai: Shanghai Science &Technology Press.
- Mae, T. 1997. Physiological nitrogen efficiency in rice: Nitrogen utilization, photosynthesis, and yield potential. Plant and Soil 196: 201–210.
- Mae, T., and K. Ohira. 1981. The remobilization of nitrogen related to leaf growth and senescence in rice plants (Oryza sativa L.). Japanese Society of Plant Physiology 22: 1067–1074.
- Makino, A., T. Mae, and K. Ohira. 1984. Relation between nitrogen and ribulose-1, 5-bisphosphate carboxylase in rice leaves from emergence through senescence. Plant and Cell Physiology 25: 429–437.
- Naklang, K. 1996. Growth of rice cultivars by direct seeding and transplanting under upland and lowland conditions. Field Crops Research 48: 115–123.
- Novoa, R., and R. Loomis. 1981. Nitrogen and plant nutrition. Plant and Soil 58: 177–204.
- Pandey, S., L.E. Velasco, and N. Suphanchaimat. 2002. Direct seeding: Research strategies and opportunities. Manila, the Philippines: International Rice Research Institute.
- Pao, S.H. 2005. Laboratory Manual for Agriculture Analysis. Beijing: China Agriculture Press.
- Peng, S., F.V. Garcia, R.C. Laza, A.L. Sanico, R.M. Visperas, and K.G. Cassman. 1996. Increased N-use efficiency using a chlorophyll meter on high-yielding irrigated rice. Field Crops Research 47: 243–252.
- Schnier, H.F., M. Dingkuhn, S.K. De Datta, K. Mengel, and J.E. Faronilo. 1990. Nitrogen fertilization of direct-seeded flooded vs. transplanted rice. I, Nitrogen uptake, photosynthesis, growth, and yield. Crop Science 30: 1276–1284.
- Timsina, J., M.L. Jat, and K. Majumdar. 2010. Rice-maize systems of South Asia: current status, future prospects and research priorities for nutrient management. Plant and Soil 335: 65–82.
- Wang, Y.Q., J.J. Zhang, G.H. Zhu, and X.X. Peng. 2006. Differential expression of proteins in rice leaves cultivated with different forms of nitrogen nutrients. Journal of Plant Physiology and Molecular Biology 32: 403–410.
- Wu, P., and Q. Tao. 1995. Genotypic response and selection pressure on nitrogen-use efficiency in rice under different nitrogen regimes. Journal of Plant Nutrition 18: 487–500.