1.] Gupta, U.C., Kening, W. and Siyuan, L.2008 Micronutrients in Soils, Crops and Livestock. Earth Science Frontiers,15: 110-125.

2.Renwick, A.G. and Walker, R. Risk. 2008. Assessment of Micronutrients. Toxicology Letters, 180: 123-130

3.Fageria, N.K., Baligar, V.C. and Clark, R.B. 2002. Micronutrients in Crop Production. Advances in Agronomy, 77: 185-268

4. Welch, R.M. and Shuman, L. 1995. Micronutrient Nutrition of Plants Critical Reviews in Plant Sciences, 14: 49-82.

5.Mortvedt, J.J. Cox, F.R., Shuman, L.M. and Welch, R.M. 1991. Micronutrients in Agriculture Second Edition Number 4 in the Soil Science Society of America Book Series, Chapter14. Soil Science Society of America, Inc., Madison

6.Chatzistathis, T. 2014. Micronutrient Deficiency in Soils & Plants, Micronutrient Solubility and Availability in Soils. Bentham Science Publishers Ltd. Oak Park.

7.Gupta, A.P. 2005. Micronutrient Status and Fertilizer Use Scenario in India. Journal of Trace Element in Medicine and Biology, 18: 325-331.

8.Gowda, N.K.S., Ramana, J.V., Prasad, C.S. and Singh, K. 2004. Micronutrient Content of Certain Tropical Conventional and Unconventional Feed Resources of Southern India. Tropica Animal Health and Production, 36: 77-94.

9.Sharma, J.C. and Chaudhary, S.K. 2007. Vertical Distribution of Micronutrient Cations in Relation to Soil Characteristics in Lower Shiwalika of Solan District in North-West Himalayas. Journal of the Indian Society of Soil Science, 55: 40-44

10.Venkastesh, M.S., Majumdar, B.K. and Patriam, K. 2003. Status of Micronutrient Cations under Various Land Use Systems of Meghalaya. Journal of the Indian Society of Soil Science, 51: 60-64.

11.Hodgson, J.F. 1963. Chemistry of micronutrient element in soil Adv. Agrn., 15: 15-9

12.Mathur, G.M., Dev, R. and Yadav, B.S. 2006. Status of zinc in irrigated north west plain soils of Rajasthan, Journal of the Indian Society of Soil Science, 54: 359-361.

13. Hundal, H.S., Raj, K., Singh, D. and Machandra, J.S. 2006. Available Nutrient and Heavy Metal Status of Soils of Punjab, North-West India. Journal of the Indian Society of Soil Science, 54: 50-56

14.Anil, S., Sharma, P.K., Tur, N.S. and Nayyar, V.K2009 Micronutrient Status and Their Spatial Variability in Soils of Muktsar District of Punjab—A GIS Approach. Journal of the Indian Society of Soil Science, 57: 300-306.

15.Kumar, M. and Babel, A.L. 2011. Available Micronutrient Status and Their Relationship with Soil Properties of Jhunjhunu Tehsil, District Jhunjhunu, Rajasthan, India. Journal of Agricultural Science, 3: 97-106

16.Patra, P., Mondal, S. and Ghosh, G.K. 2012. Status of Available Sulphur in Surface and Sub- Surface Soils of Red and Lateritic Soils of West Bengal. International Journal of Plant Animal and Environmental Sciences, 2: 276-281

17.Singh, A.H., Kumarjit, S.R.K., Singh L.N., Gopimohan, S.N., Nandini, C. and Kumar, S.A.K. 2007. Sulphur Status and forms in Acid Soils of Manipur. Indian Journal of Agricultural Research, 41:205-209

18.Velmurugana, R., Mahendranb, P.P., Wania, S.P., Uttama, K. and Prabhavathic, M. 2013. Molybdenum Status and Critical Limit in the Soil for Green Gram (Vigna radiata) Growing in Madurai and Sivagangai Districts of Tamil Nadu, India. Soil Science and Plant Nutrition 59: 229-236.

19. Dhamak, A.L., Meshram, N.A. and Waikar, S.L. 2014. Assessment of Micronutrient Indices in Soils of Ambajogai Tahsil of Beed District under Semiarid Agro Ecological Region (Maharashtra). Journal of Research in Agriculture and Animal Science, 2:40-43.

20.Tan, K.H. 2005. Soil Sampling, Preparation and Analysis. 2nd Edition, CRC Press, Boca Raton. https://www.crcpress. com/Books-in-Soils-Plants-and-the-Environment/bookseries/CRCBKSPE

21.Sippola, J. 1994. Acid Ammonium Acetate-EDTA Universal Extractant in Soil Testing and Environmental Monitoring. Communications in Soil Science and Plant Analysis, 25: 1755-1761

22.Zbiral, J. 1992. Determination of Molybdenum in HotWater Soil Extracts: Influence of pH and Available Iron on the Molybdenum Content. Communications in Soil Science and Plant Analysis, 23:817-825

23.Rudnick, R.L. and Gao, S. 2003. The Composition of the Continental Crust. In: Holland, H.D. and Turekian, K.K., Eds., Treatise on Geochemistry, Vol. 3: The Crust, ElsevierPergamon, Oxford, 1-64. http://dx.doi.org/10.1016/b0-08- 043751-6/03016-4