1. Acharya CL, Sood MC (1992) Effect of tillage methods on soil physical properties and water expense of rice on an acidic alfisols. J Indian Soc Soil Sci 40:409–414
2. Balasubramanian V, Ladha JK, Gupta R, Naresh RK, Mehla RK, Bijay-Singh, Yadvinder-Singh (2003) Technology options for rice in the rice–wheat system in South Asia. In: Ladha JK, Hill JE, Duxbury JM, Gupta RK, Buresh RJ (eds) Improving the productivity and sustainability of rice–wheat systems: issues and impacts, ASA Special Publication 65. ASA Inc., CSSA Inc., SSSA Inc., Madison, pp 115–147
3. Baruah TC, Borthakur HP (1997) A text book of soil analysis. Vikas Publishing, New Delhi
4. Beyrouty CA, Wells BR, Norman RJ, Marvel JN, Pillow JA (1987) Characterization of rice roots using a mini-rhizotron technique. In: Talyor HM (ed) Minirhizotron observation tubes: methods and applications for measuring rhizosphere dynamics, ASA Special Publication No. 50. ASA Inc., CSSA Inc., SSSA Inc., Madison, pp 99–108
5. Choudhury BU, Bouman BAM, Singh AK (2007) Yield and water productivity of rice–wheat on raised beds at New Delhi, India. Field Crops Res 100:229–239