In the fertiliser trade, most of the standard fertiliser mixtures contain only 80 to 95% of fertilising materials, the remaining being made up of some make-weight materials known as fillers. The fillers play an important role in fertiliser mixtures by serving as a corrective of the residual acidity and also as conditioning agents. Press-mud, a solid material obtained in large quantities from sugar factories during the process of clarification of cane juice, may be useful as a filler on account of the nutrients contained in it. With this end in view, an observational trial was conducted using press-mud of different particle sizes as a filler in the sugar cane manure mixture 16:4:4.
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