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Low-grade Rock Phosphate with Zeolite can be a Valuable P Fertilizer for Crops

In India, most of the indigenous deposits of rock phosphate are low grade. While high-grade quality rock phosphate is used to produce phosphatic fertilizers which are found to be costly. If the low-grade indigenous deposits of rock phosphate are utilized at full extent, in can reduce the cost of P fertilizers and also meet the crop P demand however, technologies by which P from indigenous low grade rock phosphate can be solubilized and utilized as a source of P fertilizer are required that are feasible to be adopted by farmers. They include composting with farm manure, green manuring, partial acidulation of rock phosphate, use of phosphorus solubilizing organisms, etc. Recent technology is the use of naturally occurring zeolites.