A. Jeyabal and G. Kuppuswamy, “Recycling of Organic Wastes for the Production of Vermicompost and Its Response in Rice-Legume Cropping System and Soil Fertility,” European Journal of Agronomy, Vol. 15, No. 3, 2001, pp. 153-170. doi:10.1016/S1161-0301(00)00100-3
 S. Peng, K. G. Cassman, S. S. Virmani, J. Sheehy and G. S. Khush, “Yield Potential Trends of Tropical Rice since Release of IR8 and the Challenge of Increasing Rice Yield Potential,” Crop Science, Vol. 39, No. 6, 1999, pp. 1552-1559. doi:10.2135/cropsci1999.3961552x
 L. P. Yuan, “Hybrid Rice Breeding in China,” In: S. S. Virmani, et al., Ed., Advances in Hybrid Rice Technology, Proceeding of 3rd International Symposium on Hybrid Rice, Hyderabad, 14-16 November 1996, pp. 27-33.
 A. K. Gautam, D. Kumar, Y. S. Shivay and B. N. Mishra, “Influence of Nitrogen Levels and Plant Spacing on Growth, Productivity and Quality of Two Inbred Varieties and a Hybrid of Aromatic Rice,” Archives of Agronomy and Soil Science, Vol. 54, No. 5, 2008, pp. 515-532. doi:10.1080/03650340802283470
 R. B. Singh, “Environmental Consequences of Agricultural Development: A Case Study for the Green Revolution State of Haryana, India,” Agriculture Ecosystem and Environment, Vol. 82, No. 1-3, 2000, pp. 97-103. doi:10.1016/S0167-8809(00)00219-X
 J. K. Friedel, “The Effect of Farming System on Labile Fractions of Organic Matter in Calcari-Epileptic Regosols,” Journal of Plant Nutrition Soil Science, Vol. 163, No. 1, No. 2000, pp. 41-45. doi:10.1002/(SICI)1522-2624(200002)163:1<41::AID-JPLN41>3.0.CO;2-9
 S. K. Reddy, M. Singh, A. K. Tripathi, M. S. Singh and N. Manbendra, “Changes in Amount of Organic and Inorganic Fractions of Nitrogen in an Eutrochrept Soil after Long-Term Cropping with Different Fertilizer and Organic Manure Inputs,” Journal of Plant Nutrient Soil Science, Vol. 166, No. 2, 2003, pp. 232-238.
 W. E. Larson and C. E. Clapp, “Effect of Organic Matter on Soil Physical Properties,” In: W. E. Larson and C. E. Clapp, Ed., Organic Matter and Rice, International Rice Research Institute, Manila, 1884, pp. 363-385.
 P. V. V. Prasad, V. Satyanarayana, V. R. K. Murthy and K. J. Boote, “Maximizing Yields in Rice-Groundnut Cropping Sequence through Integrated Nutrient Management,” Field Crops Research, Vol. 75, No. 1, 2002, pp. 9-21. doi:10.1016/S0378-4290(01)00214-3
 A. Dobarmman and C. Witt, “The Potential Impact of Crop Intensification on Carbon and Nitrogen Cycling in Intensive Rice Systems,” In: G. J. D. Kirk and D. C. Olk, Ed., Carbon and Nitrogen Dynamics in Flooded Soils, International Rice Research Institute, Manila, 2000, pp. 1-25.
 D. S. Powlson and D. C. Olk, “Long-Term Soil Organic Matter Dynamics” In: G. J. D. Kirk and D. C. Olk, Ed., Carbon and Nitrogen Dynamics in Flooded Soils, International Rice Research Institute, Manila, 2000, pp. 49-63.
 A. Walkley and I. A. Black, “An Examination of the Degtjareff Method for Determining Soil Organic Matter, and Proposed Modification of the Chromic Acid Titration Method,” Soil Science, Vol. 37, No. 1, 1934, pp. 29-38. doi:10.1097/00010694-193401000-00003
 M. Mwale, A. Mapiki and L. K. Phiri, “To Synchronize Nutrient Availability with Plant Uptake,” In: M. Mwale, A. Mapiki and L. K. Phiri, Ed., The Biology and Fertility of Tropical Soils, A TSBF Report 1997-1998, 2000, pp. 40-41.
 A. Swarup and N. P. S. Yaduvanshi, “Impact of Ten-Year Rice-Wheat Cropping System and integrated Nutrient Management on Soil Properties and Crop Productivity in a Gypsum Amended Sodic Soil,” 18th World Congress of Soil Science, Philadelphia, 9-15 July 2006.
 P. Banik., P. K. Ghosal, T. K. Sasmal, S. Bhattacharya, B. K. Sarkar and D. K. Bagchi, “Effect of Organic and Inorganic Nutrients for Soil Quality Conservation and Yield of Rainfed Low Land Rice in Sub-Tropical Plateau Region,” Journal of Agronomy and Crop Science, Vol. 192, No. 5, 2006, pp. 331-343. doi:10.1111/j.1439-037X.2006.00219.x