1. Acharya, R. and Shrestha, B.B. (2012). Physiochemical characteristics of soil of a mixed shorea robusta forest in Rupandehi district, Nepal. J. Nat. Hist. Mus., 26: 155-162. https://doi.org/10.3126/jnhm.v26i0.14139
2. Allison, F.A. (1973). Soil Organic Matter and Its Role in Crop Production. Elsevier, Amsterdam
3. Amacher, M.C., O’Neil, K.P. and Perry, C.H. (2007). Soil vital signs: A new soil quality index (SQI) for assessing forest soil health. Res. Pap. RMRS-RP-65WWW. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. https://doi.org/10.2737/RMRS-RP-65
4. Andrews, S.S., Karlen, D.L. and Mitchell, J.P. (2002). A comparison of soil quality indexing methods for vegetable production systems in Northern California. Agriculture, Ecosystems & Environment, 90: 25-45. https://doi.org/10.1016/S0167-8809(01)00174-8
5. Anup, A., Bhandari, G., Wagle, S.P. and Banjade, Y. (2013). Status of soil fertility in a community forest of Nepal. Int. J. Env., 1(1): 56-67. https://doi.org/10.3126/ije.v1i1.8528
6. Awasthi, K.D., Singh, B.R. and Sitaula, B.K. (2005). Profile carbon and nutrient levels and management effect on soil quality indicators in the Mardi watershed of Nepal. Acta Agr. Scand. Sec. B-Soil and Plant, 55: 192-204. https://doi.org/10.1080/09064710510029079
7. Bajracharya, R.M., Sharma, S., Dahal, B.M., Sitaula, B.K. and Jeng, A. (2006). Assessment of soil quality using physiochemical and biological indicators in a mid-hills watershed of Nepal. Climate Change Feature Archive. Bali, Indonesia. 3-14 Dec
8. Barbour, M.G., Burk, J.H., Pitts, W.D., Gilliam. F.S. and Schwartz, M.W. (1999). Terrestrial Plant Ecology. Benjamin/Cummings, an imprint of Addison Wesley Longman, California, USA
9. Bhatnagar, H.P. (1965). Soils from different quality Sal (S. robusta) forests of Uttar Pradesh. Trop. Ecol., 6: 56-62
10. Bhatta, D.D. (1981). Nepal Himalaya and change. In: Laal JS (ed), Himalaya: Aspects of Change. Oxford University Press, New Delhi
11. Binkley, D. and Vitousek, P.M. (1989). Soil nutrient availability. In: Pearey, R. W., J. Ehleringer, H. A., Mooney and P. W. Rundel (Eds), Plant Physiological Ecology: Field Methods and Instrumentation. Chapman and Hall, London
12. Bouyoucos, C.J. (1962). Hydrometer method improved for making particle size analysis of soils. Agronomy Journal, 54: 464-465. https://doi.org/10.2134/agronj1962.00021962005400050028x
13. Bray, R.H. and Kurtz, L.T. (1945). Determination of total, organic and available forms of phosphorus in soils. Soil Sci., 59: 39-45. https://doi.org/10.1097/00010694-194501000-00006
14. Brady, N.C. (2000). The Nature and Properties of Soils. Tenth edition, Prentice’ hall of India Private limited, New Delhi.
15. Carter, M.R. (2002). Soil quality for sustainable land management: Organic matter and aggregation Interactions that maintain soil functions. Agronomy Journal, 94: 38-47. https://doi.org/10.2134/agronj2002.3800
16. Chapin, F.S.H., Van Cleve, K. and Vitousek, P.M. (1986). The nature of nutrient limitation in plant communities. Am. Nat., 127:148-58. https://doi.org/10.1086/284466
17. Chapman, J.L. and Reiss, M.J. (1992). Ecology: Principles and Applications. University Press, Cambridge
18. DoAC. (2011). Soil Testing in India. Department of Agriculture and Cooperation, New Delhi
19. Dobermann, A. and Cassman, K.G. (2002). Plant nutrient management for enhanced productivity in intensive grain production systems of the United States and Asia. Plant and Soil, 247: 23. https://doi.org/10.1007/978-94-017-2789-1_12
20. Gunaga, R.P., Kanfade, A.H. and R.,V. (2011). Soil fertility status of 20 seed production areas of Tectona grandis Linn. f. in Karnataka, India. J. For. Sci., 57(11): 483-490. https://doi.org/10.17221/119/2010-JFS
21. Gupta, M.K. and Sharma, S.D. (2008). Effect of tree plantation on soil properties, profile morphology and productivity index I. Poplar in Uttarakhand. Ann. For., 16(2): 209 -224
22. Gupta, M.K. and Sharma, S.D. (2009). Effect of tree plantation on soil properties, profile morphology and productivity index II. Poplar in Yamunanagar district of Haryana. Ann. For., 17(1): 53-70
23. Hoskin, B.R. (1997). Soil Testing Handbook for Professionals in Agriculture, Horticulture, Nutrient and Residuals Management, 3rd edition, Maine Forestry & Agricultural Experiment Station University of Maine
24. Jackson, M.L. (1967). Soil Chemical Analysis. Prentice – Hall of India Pvt. Ltd. New Delhi
25. Johnston, A.E. (1986). Soil organic matter, effects on soil and crops. Soil Use Manag., 2: 97-105. https://doi.org/10.1111/j.1475-2743.1986.tb00690.x
26. Jordan, C.F. (1985). Nutrient Cycling in Tropical Forest Ecosystems. John Wiley, Chichester
27. Juwa, G.B. (1987). Soil and sites of selected plantation areas in the Kathmandu project area of the hill forestry development project. Kathmandu: Forest Research Division, Department of Forestry and Research, HMGN
28. Kiran, G.S. and Kaur, M.R. (2011). Economic valuation of forest soils. Current Science, 100 (3): 396 – 398
29. Larson, W.E. and Pierce, F.J. (1994). The dynamic of soil quality as a measure of sustainable management. In: Doran, J. W. et al. (eds). Defining Soil Quality for a Sustainable Environment. ASA and SSSA, Madison, WI
30. Lodhiyal, L.S. and Lodhiyal, N. (1996). Aspects of productivity and nutrient cycling of Poplar (Populus deltoid Marsh) plantation in the moist plane area of Central Himalaya. Oecologia Montana, 6: 28 – 34
31. Miles, J. (1977). The influence of tree on soil properties. Annual Report, Institute of Terrestrial Ecology
32. Miller, C.E. (1965). Soil Reaction and Liming Soil Fertility. John Wiley and Sons Inc, New York
33. NARC (1999). Annual Report 1998/99. Nepal Agricultural Research Council, Soil Science Division, Kathmandu
34. Nye, P.H. (1961). Organic matter and nutrient cycles under moist tropical forest. Plant and Soil, 8: 323-346. https://doi.org/10.1007/BF01394645
35. Regmi, B.D. and Michael, A.Z. (2004). Soil fertility status of Bari and Khet land in a small watershed of middle hill region of Nepal. Nepal Agric. Res. J., 5: 38-44
36. Ruess, J.O. and Innis, G.S. (1977). A grassland nitrogen flow simulation model. Ecology, 58: 348-357. https://doi.org/10.2307/1935612
37. Sanchez, P.A. (1976). Properties and Management of Soil in the Tropics. John Wiley, New York
38. Shah, R. (1999). Soils: Their problems and management. In: Majupuria T. C. (Eds), Nepal: Nature’s Paradise. Hillside Press Ltd., Kathmandu
39. Sharma, R.P. (2013). Status of soil nutrients and its relation with rock types and soil properties in the Kankali (Chitwan) and Tibrekot (Kaski) Community Forests, western Nepal. J. Nep. Geo. Soc., 46: 211-216. https://doi.org/10.3126/jngs.v46i0.31606
40. Sharma, R.P. and Chhetri, B.B.K. (2012). Analysis of rocks, soils and vegetation characteristics of Kankali (Chitwan) and Tibrikot (Kaski) community forests of Nepal. J. Nep. Geo. Soc., 44: 13-22. https://doi.org/10.3126/jngs.v44i0.24484
41. Sigdel, E.R. (1994). Physico-chemical properties of soil in Royal Chitwan National Park [thesis]. Central Department of Botany, Tribhuvan University, Kathmandu
42. Singh, S.P. and Singh, J.S. (1989). Ecology of central Himalayan forest with special reference to sal forest ecosystem. In: Singh, J. S. and Gopal, B. (Eds), Perspective in Ecology. Jagamander Book Agency, New Delhi
43. Steiner, C., Teixeira, W.G., Lehmann, J., Nehls, T., Vasconcelos de Macêdo, J.L., Blum, W.E. H., and Zech, W. (2007). Long term effects of manure, charcoal and mineral fertilization on crop production and fertility on a highly weathered Central Amazonian upland soil. Plant and Soil, 291: 275 - 290. https://doi.org/10.1007/s11104-007-9193-9
44. Tiwari, K.R., Sitaula, K.B., Borresen, T. and Bajracharya, S.M. (2006). An assessment of soil quality in Pokhare Khola watershed of the Middle Mountains in Nepal. J. Food, Agri. and Env., 4(3): 276- 283
45. Walkley, A. (1947). An examination of methods for determining organic carbon and nitrogen in soils. J. Agri. Sci., 25: 598-609. https://doi.org/10.1017/S0021859600019687
46. Wang, J., Fu, B., Qiu, Y. and Chen, L. (2003). Analysis on soil nutrient characteristics for sustainable land use in Danangou catchment of the Loess Plateau, China. Catena, 54: 17-29. https://doi.org/10.1016/S0341-8162(03)00054-7
47. Yakovchenko, V.P., Sikora, L.J. and Millner, P.D. (1998). Carbon and nitrogen mineralization of added particulate and macro organic matter. Soil Biology and Biochemistry, 30: 2139-2146. https://doi.org/10.1016/S0038-0717(98)00096-0
48. Young, A. (1985). Effects of Trees on Soils. Commonwealth Series Council