1. Alban, David H. (1985). Seasonal changes in nutrient concentration and content of Aspen suckers in Minnesota. Forest Sci., 31(3) : 785-794
2. Barrueco, C.R., Miguel, C. and Subramanium, P. (1984). Seasonal fluctuations of the mineral concentration of Alder (Alnus glutinosa L. Gaertn.) from the field. Plant and Soil, 78 : 201-208. https://doi.org/10.1007/978-94-009-6158-6_18
3. Bell, David T. and Ward, S.C. (1984). Seasonal changes in foliar macronutrients (N, P, K, Ca and Mg) in Eucalyptus saligna Sm.aAnd E. wandoo Blakely growing in rehabilitated bauxite mine soils of Darling Range, Western Australia, Plant and Soil, 81 : 377-388. https://doi.org/10.1007/BF02323052
4. Bingham, Frank T. (1961). Seasonal trends in nutrient compsotion of Hass Avocado leaves. Proc. American Society Horti. Sci., 78 : 149-160
5. Chapman, H.D. (1965). Total exchangeable bases. In : Methods of Soil Analysis Part-1. C.a. Black (ed.). American Society of Agronomy. Madison Wisconsin, USA, pp. 902-904. https://doi.org/10.2134/agronmonogr9.2.c7
6. Deb Roy, R., Shankernarayan, K.A. and Pathak, P.S. (1980). Fodder trees and their importance in India. Indian For., 106(4) : 306-311
7. Evans, Julian (1979). The effects of leaf position and leaf age in foliar analysis of Gmelina arborea. Plant and Soil, 52 : 547-552. https://doi.org/10.1007/BF02277950
8. Guha, M.M. and Mitchell, R.L. (1966). The trace and major element composition of leaves of some deciduous trees. II. Seasonal changes. Plant and Soil, 24(1) : 90-112. https://doi.org/10.1007/BF01373076
9. Insley, H., Boswell, R.C. and Gardiner, J.B.H. (1981). Foliar macronutrients (N, P, K, Ca and Mg) in Lime (Tilia sp.). II. Seasonal variation. Plant and Soil, 61 : 394-401. https://doi.org/10.1007/BF02182019
10. Jackson, M.L. (1958). Soil Chemical Analysis. Prentice Hall of India, Pvt. Ltd., New Delhi
11. Jackson, M.L. (1973). Soil Chemical Analysis. Prentice Hall of India, Pvt. Ltd., New Delhi
12. Kishore, Kamal, Mishra, V.K. and Verma, K.S. (1995). Seasonal changes in micro-nutrients in Ulmus villosa – a potential Agroforestry species. J. Tree Sci., 14(1) : 19-21
13. Labanuskas, C.K., Embleton, T.W., Jones, W.W. and Garber, M.J. (1961). Seasonal changes in concentration of zinc, copper, boron, manganese and iron in Fuerto Avocado leaves. Proc. American Soc. Horti Sci, 77: 173-179
14. Langille, W.M. and Maclean, K.S. (1976). Some essential nutrient elements in forest plants as related to species, plant part, season and location. Plant and Soil, 45 : 17-26. https://doi.org/10.1007/BF00011125
15. Laurie, M.V. (1945). Fodder trees in India. Indian For. Leaflet, 82 (Silv.). FRI, Dehra Dun
16. Merwin, H.D. and Peech, M. (1951). Exchangeability of soil potassium in sand, silt and clay fractions as influenced by the nature of complementary exchangeable cations. Soil Sci. Soc. America Proc., 15 : 125-128. https://doi.org/10.2136/sssaj1951.036159950015000C0026x
17. Olsen, S.R., Cole, W., Watenabe, F.S. and Dean, L.A. (1954). Estimation of available phosphorus in soils by extraction with sodium bicarbonate. In : Methods of Soil Analysis (Black, C.A. ed., 1965). Madison, WIS, American Society of Agronomy, pp.1044-1046
18. Piper, C.S. (1966). Soil and Plant Analysis (Asian ed.). Hans Publishers, Mumbai
19. Sharma, J.K., Mishra, V.K. and Verma, K.S. (2003). Micronutrients dynamics in foliage of Acer oblongum, Bauhinia retusa and Mallotus philippensis. In : Proc. IUFRO-ISTS-UHF International Conference on World Perspective on Short Rotation Forestry for Industrial and Rural Development
20. Sharma, J.K., Mishra, V.K. and Verma, K.S. (2006). Seasonal variations in macronutrient contents of Acer oblongum and Morus alba foliage in North-west Himalayas, Himachal Pradesh. Ann. For., 14(20) : 268-277
21. Sharma, J.K., Verma, K.S. and Prabhakar, M. (2008). Impact of seasonal changes and leaf age on the macro and micronutrients contents in the foliage of Quercus leucotrichophora and Quercus glauca in North-western Himalayas. J. Tree Sci., 27(2) : 59-79
22. Singh, R.V. (1988). Fodder Trees of India. Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi
23. Subbiah, B.V. and Asija, G.S. (1956). A rapid procedure for the estimation of available nitrogen in soils. Curr. Sci., 25 : 259-260
24. Troup, R.S. (1921). The Silviculture of Indian Trees. Vol. I, II and III. Oxford, Claredon Press
25. Verma, K.S. and Mishra, V.K. (1989). Nutrient dynamics studies in agroforestry species of Western Himaloayas. I : Macronutrients in Robinia pseudoacacia and Grewia optiva. Indian J. For., 12(2) : 96-100.
26. Verma, K.S. and Mishra, V.K. (1999). Foliage nutrient concentration and lopping time of Agroforestry tree species in the Western Himalayan region of India. Agrofor. Syst., 42 : 283-290. https://doi.org/10.1023/A:1006151614882
27. Walkley, A. and Black, T.A. (1935). An experimentation of the vegetative method for determining organic matter and proposed modification of the chromic acid titration method. Soil Sci., 37 : 38-39. https://doi.org/10.1097/00010694-193401000-00003