Abstract
The paper deals with the potential use of an indigenous blast furnace slag as an useful raw material for development of controlled release fertilizers as well as moderately effective liming materials.The basic composition of the blast furnace slag was changed by melting the slag with compounds of phosphorus and potassium in different proportions. It is presumed that such controlled release of phosphorus, potassium and calcium should meet the plant requirements more effectively and with less wastage. The slag base itself should have no harmful effects because of similarity of its constituents with those of the soil.Leaching studies on the rate of release of phosphorus and potassium were carried out using modified slag samples of fixed compositions and average particle size (220 μm) in aqueous medium of pH 7. The rate of release of nutrients was found to be dependent on the composition of the modified slag, and decreased with increase in slag content. A leaching study on the liming aspect of the slag was ca...
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