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[M. Srilatha, P. Chandrasekhar Rao S. Harish Kumar Sharma and G.Padmaja (2013); Physico chemical characterisation of humic substances under long term application of fertilizers and manures in rice cropping sequence in an Inceptisol Int. J. of Adv. Res. (12). 0] (ISSN 2320-5407). www.journalijar.com
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