Pyrite oxidation at different soil ESP (8.5, 30.1, 48.0, 63.0 and 79.0) under laboratory conditions and its efficiency on change in soil sodicity indices as well as crop yield with pyrite @ 0. 25, 50, 75 and 100% of gypsum requirement on equivalent S basis in a pot experiment under paddy- wheat crop sequence were studied. The magnitude of pyrite oxidation reduced from 59.5% at 8.5 ESP to 16.9% at ESP of 79.0. Presence of CaCO3 to the extent of 4% did not stimulate the rate of pyrite oxidation. Even such a low pyrite oxidation was sufficient to produce significant response of its application to crop yield as well as reduction in pH, ECe, ESP and SAR.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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