In the manufacture of mixed fertilisers,the fillers play an important role by serving as a corrective of the residual acidity and as conditioning agents.Kanwar et al.(1963)observed that there was no significant effect for any of the fillers like gypsum,press-mud and time stone on the availability of phosphotic acid in the NPK mixture.Gopalaswamy and Varadarajan (1967)found that the urea-super mixture could not be sored without bringing about reversion of phophoric acid.But the reversion could be minimised by changing the fillers or by adding urea in small quantiies to the mixture.found that
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