LEACHING LOSSES OF IRON AND MANGANESE DURING RECLAMATION OF ALKALI SOIL

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Abstract
Alkali soils are reclaimed by applying gypsum and ponding of water on the soil surface. We carried out laboratory studies to ascertain the leaching of Fe and Mn along with other soluble reaction products during reclamation. A highly alkali soil was treated with three levels each of gypsum (0,7.5, and 15 g/kg soil) and farmyard manure (0, 6.25, and 12.5 g/kg soil). The results revealed considerable losses of Fe and Mn through drainage water if soil was leached without the addition of amendments. Treatment of the soil with increasing levels of gypsum, alone or in combination with FYM, drastically reduced the Fe and Mn losses, being minimum when the two amendments were applied together. The contents of Fe and Mn in the soil consequent to leaching also varied distinctly with the treatment employed.

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