help
Organic Materials and Soil Productivity. [Monograph]
Flaig, W. \ Nagar, B. \ Söchtig, H. \ Tietjen, C. \ 1977
fertilizers - soil fertility - soil organic matter - World
help
Soil Taxonomic Database of India and the States. (1:250,000 scale) [Monograph]
Bhattacharyya, T. \ Dipak Sarkar \ Sehgal, J. \ Velayutham, M. \ Gajbhiye, K.S. \ Nagar, A.P. \ Nimkhedkar, S.S. \ 2009
soil associations - Soil Taxonomy - soil classification - India
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