Attempts have been made since 1892, both in this Institute and elsewhere, to convert the rich phosphatic material available as nodules in the Tiruchirapalli district of the Madras State into a readily available phosphatic fertilizer. The high con- tent of lime (calcium carbonate) present in the raw material mitigated against its conversion into superphosphate by the usual sulphuric acid treatment. Consequently, the material, inspite of its high total P₂O5 content (25 to 30%), remained unexploited for use as a fertilizer.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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