AOAC (1984). Official Methods of Analysis, 14th edn. Arlington, VA: Association of Official Analytical Chemists.
Belder, P., Bouman, B. A. M., Cabangon, R., Lu, G., Quilang, E. J. P., Li, Y., Spiertz, J. H. J. & Tuong, T. P. (2004). Effect of water-saving irrigation on rice yield and water use in typical lowland conditions in Asia. Agricultural Water Management 65, 193–210.
Belder, P., Spiertz, J. H. J., Bouman, B. A. M., Lu, G. & Tuong, T. P. (2005). Nitrogen economy and water productivity of lowland rice under water-saving irrigation. Field Crops Research 93, 169–185.
Bindraban, P. S., Sayre, K. D. & Solis-Moya, E. (1998). Identifying factors that determine kernel number in wheat. Field Crops Research 58, 223–234.
Bouman, B. A. M. & Tuong, T. P. (2001). Field water management to save water and increase its productivity in irrigated lowland rice. Agricultural Water Management 49, 11–30.
Bouman, B. A. M., Humphreys, E., Tuong, T. P. & Barker, R. (2006). Rice and water. Advances in Agronomy 92, 187–237.
Cai, G., Zhu, Z., Trevitt, A. C. F., Freney, J. R. & Simpson, J. R. (1986). Nitrogen loss from ammonium bicarbonate and urea fertilizers applied to flooded rice. Fertilizer Research 10, 203–215.
Cao, W., Jiang, D., Wang, S. & Tian, Y. (2002). Physiological characterization of rice grown under different water management systems. In Water-wise Rice Production. Proceedings of the International Workshop on Water-wise Rice Production (Eds Bouman, B. A. M., Hengsdijk, H., Hardy, B., Bindraban, P. S., Tuong, T. P. & Ladha, J. K.), pp. 249–257, Los Baños, Philippines: International Rice Research Institute (IRRI).
Cui, Y. T., Cheng, X., Han, C. R. & Li, R. G. (2000). The economic and ecological satisfactory amount of nitrogen fertilizer using on rice in Tai Lake Watershed. Acta Ecologica Sinica 20, 659–662.
De Wit, C. T. (1953). A Physical Theory on Placement of Fertilizers. Verslagen Landbouwkundig Onderzoek (Agricultural Research Reports) 59.4, s'Gravenhage, The Netherlands: Staatsdrukkerij.
Dobermann, A., Witt, C., Abdulrachman, S., Gines, H. C., Nagarajan, R., Son, T. T., Tan, P. S., Wang, G. H., Chien, N. V., Thoa, V. T. K., Phung, C. V., Stalin, P., Muthukrishnan, P., Ravi, V., Babu, M., Simbahan, G. C. & Adviento, M. A. A. (2003). Soil fertility and indigenous nutrient supply in irrigated rice domains of Asia. Agronomy Journal 95, 913–923.
Fan, M. S., Jiang, R. F., Liu, X. J., Zhang, F. S., Lu, S. H., Zeng, X. Z. & Christie, P. (2005). Interactions between non-flooded mulching cultivation and varying nitrogen inputs in rice-wheat rotations. Field Crops Research 91, 307–318.
FAO (2003). Water Management: Towards 2030. Rome: FAO.
FAO (2006). Guidelines for Soil Description. Rome: FAO.
Fischer, R. A. (1985). Number of kernels in wheat crops and the influence of solar radiation and temperature. Journal of Agricultural Science, Cambridge 105, 447–461.
Huke, R. & Huke, E. (1992). Rice/Wheat Atlas of South Asia. Los Baños, Philippines: IRRI.
Islam, M. S. & Morison, J. I. L. (1992). Influence of solar-radiation and temperature on irrigated rice grain-yield in Bangladesh. Field Crops Research 30, 13–28.
Kropff, M. J., Cassman, K. G., Peng, S., Matthews, R. B. & Setter, T. L. (1994). Quantitative understanding of yield potential. In Breaking the Yield Barrier (Ed. Cassman, K. G.), pp. 21–38. Los Baños, Philippines: IRRI.
Ladha, J. K., Dawe, D., Ventura, T. S., Singh, U., Ventura, W. & Watanabe, I. (2000). Long-term effects of urea and green manure on rice yields and nitrogen balance. Soil Science Society of America Journal 64, 1993–2001.
Li, Y. & Zhang, J. (1999). Agricultural diffuse pollution from fertilisers and pesticides in China. Water Science and Technology 39, 25–32.
Lin, S., Dittert, K., Tao, H., Kreye, C., Xu, Y., Shen, Q., Fan, X. & Sattelmacher, B. (2002). The ground-cover rice production system (GCRPS): a successful new approach to save water and increase nitrogen fertilizer efficiency? In Water-wise Rice Production. Proceedings of the International Workshop on Water-wise Rice Production (Eds Bouman, B. A. M., Hengsdijk, H., Hardy, B., Bindraban, P. S., Tuong, T. P. & Ladha, J. K.), pp. 187–195. Los Baños, Philippines: IRRI.
Mao, Z. (1993). Study on evaluation of irrigation performance in China. In Proceedings of Asian Regional Symposium on Maintenance and Operation of Irrigation/Drainage Scheme and Improved Performance, pp. 6–35. Beijing.
Nix, H. A. (1976). Climate and crop productivity in Australia. In Climate and Rice (Ed. Yoshida, S.), pp. 495–507. Los Baños, Philippines: IRRI.
Ortiz-Monasterio, J. I., Dhillon, S. S. & Fischer, R. A. (1994). Date of sowing effects on grain yield and yield components of irrigated spring wheat genotypes and relationships with radiation and temperature in Ludhiana, India. Field Crops Research 37, 169–184.
Peng, S., Huang, J., Zhong, X., Yang, J., Wang, G. & Zou, Y. (2002). Research strategy in improving fertilizer-nitrogen use efficiency of irrigated rice in China. Scientia Agricultura Sinica 35, 1095–1103.
Timsina, J. & Connor, D. (2001). Productivity and management of rice-wheat cropping systems: issues and challenges. Field Crops Research 69, 93–132.
Timsina, J., Singh, U., Badaruddin, M., Meisner, C. & Amin, M. R. (2001). Cultivar, nitrogen, and water effects on productivity, and nitrogen-use efficiency and balance for rice-wheat sequences of Bangladesh. Field Crops Research 72, 143–161.
Van Keulen, H. (1982). Graphical analysis of annual crop response to fertilizer application. Agricultural Systems 9, 113–126.
Wang, D. J., Lin, J. H., Sun, R. J., Xia, L. Z. & Lian, G. (2003). Optimum nitrogen rate for a high productive rice-wheat system and its impact on the groundwater in the Taihu Lake area. Acta Pedologica Sinica 40, 426–432.
Witt, C. & Dobermann, A. (2004). Towards a decision support system for site-specific nutrient management. In Increasing Productivity of Intensive Rice Systems Through Site-specific Nutrient Management (Eds Dobermann, A., Witt, C. & Dawe, D.), pp. 359–396. Enfield, NH, USA/Los Baños, Philippines: Science Publishers Inc./IRRI.
Xie, C., Cheng, G. & Feng, Z. (1995). Managing techniques for high-yield cultivation in mechanical direct seeding rice fields and line seeding wheat fields under mechanised minimum tillage. Acta Agriculturae Shanghai 11, 57–62.
Xing, G. X. & Zhu, Z. L. (2000). An assessment of N loss from agricultural fields to the environment in China. Nutrient Cycling in Agroecosystems 57, 67–73.
Xu, X. & Wu, J. (1999). Effective utilization of N fertilizers by wheat and the effects of N fertilizer application on pollution of water body environment. Chinese Journal of Soil Science 30, 268–270.
Yang, C. M., Yang, L. Z., Yang, Y. X. & Zhu, O. Y. (2004). Rice root growth and nutrient uptake as influenced by organic manure in continuously and alternately flooded paddy soils. Agricultural Water Management 70, 67–81.
Zheng, J. (2000). Rice–wheat cropping system in China. In Soil and Crop Management Practices for Enhanced Productivity of the Rice–Wheat Cropping System in the Sichuan Province of China (Eds Hobbs, P. R. & Gupta, R. K.), pp. 1–10. Rice–Wheat Consortium Paper Series 9. New Delhi, India: Rice–Wheat Consortium for the Indo-Gangetic Plains.
Zhu, J. G., Han, Y., Liu, G., Zhang, Y. L. & Shao, X. H. (2000). Nitrogen in percolation water in paddy fields with a rice/wheat rotation. Nutrient Cycling in Agroecosystems 57, 75–82.
Zhu, Z. L., Cai, G. X., Simpson, J. R., Zhang, S. L., Chen, D. L., Jackson, A. V. & Freney, J. R. (1989). Processes of nitrogen loss from fertilizers applied to flooded rice fields on a calcareous soil in North-central China. Fertilizer Research 18, 101–115.