1. Anon. (1990). I.C.A.R. Research Complex Annual Report. Indian Council of Agricultural Research,Research Complex for NEH region, Shilong.
2. Benerjee, S.K.; Das, P.K. and Mishra, T.K. (2000a). Microbial and nutritional characteristics of coal mine overburden spoils in relation to vegetation development. Journal of Indian Society of Soil Science. 48 (1) : 63 - 66.
3. Banerjee, S.K.; Kashyap, M.K. and Sinha, A. (2000b). Vegetation status, nutritional characteristics and biological activity of manganese mine overburden spoils in relation to age. Indian Forester, 126 : 742 - 748.
4. Borthakur, D.N. (19920. Agriculture of the North Eastern Region with Special Reference to Agriculture. BeeCee Prakashan, Guwahati.
5. Follet, R.H. and Lindsey, W.L. (1970). Technical Bulletin 110, Colorodo Agriculture Experiment Station.
6. Jackson, M.L. (1973). Soil Chemical Analysis. Prentice Hall of India Pvt. Ltd. New Delhi
7. Kalra, Y. P. and Maynard, D.G. (1991). Methods manual for forest soil and plant analysis, Forestry Canada. Northwest Region, Northern Forestry Center, 74-77.
8. Knezek, B.D. and Ellis, B.G. (1980). Essential micro- nutrients iv: copper, iron, manganese and zinc In Barian E.D. (ed) Applied Soil Trace Elements. John Wiley and Sons, New York. pp
9. Lindsey, W. L. and Norvell, W.A. (1978). Development DTPA Soil test for Zinc, Iron, Manganese and Copper. Soil Science Society of America Journal, 42 : 421 - 428. https://doi.org/10.2136/sssaj1978.03615995004200030009x
10. Nongkynrih, P.; Dkhar, P.S. and Khating, D.T. (1996). Micro-nutrient elements in acid affisols of Meghalaya under Rice cultivation. Journal of the India Society of Soil Science, 44 (3) : 455 - 457.
11. Patiram, Upadhyaya, R.C. and Singh, L.N. (1995). An appraisal of Ginger (Zingiber officinale Rosc.) production in Sikkim, India. Journal of Spice and Aromatic Crops, 4 (2) : 111 - 118.
12. Richards, L.A. (ed) (1954). Diagnosis and Improvement of Saline and Alkali Soil. Agriculture Hand-book 60, U.S. Department of Agriculture, Washington D.C. https://doi.org/10.1097/00010694-195408000-00012
13. Sharma, U.C. and Shukla, L.M. (2001). Nutrient mining in different agroclimatic zones of the North-Eastern Hills Region, Fertilizer News, 46 (4) : 115 - 119.
14. Shukla, L.M. and Lyngdob, J.C. (1990). Zinc status of soils of Meghalaya in relation to their characteristics. Journal of the Indian Society of Soil Science, 38 : 315 - 316.
15. Singh, B.P.; Das, Madhumita, Ram, M.; Dwivedi, B.S. and Prasad, R.N. (1992). Characterization of Fe- toxic soils and affected plants in Meghalaya. Journal of the Indian Society of Soil Science, 40 : 326 - 328.
16. Uma Shankar, Boral, L.; Pandey, H. N. and Tripathi. R.S. (1993). Degradation of land due to coal mining and its natural recovery pattern. Current Science, 65 (9) : 680 - 687.