References
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[4]. Donahou, Roy C. Our Soils and their Managements, Bombay 1973, P.2.
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[6]. Cook, R.L., Soil Management for conservation and production, New York 1962, P.285.
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[12]. Idid, P.17.
[13]. ‘Smaller Farm Lands can Yield More’, Op. Cit, P.20-21.