Studies on potassium chloride based –controlled release fertilizer made from sand– cement matrix coated with napthalene.

Sand matrix based KCl controlled release fertilizer is made and tested. The parameters of the study are initial fraction of KCl, fractional binder, Fractional inert, Diameter of the pellet and Particle size of the sand. The release of fertilizer from the pellet depended on the compositional parameters of the study. Based on Fick`s second law, a model was developed for the sand matrix fertilizers with napthalene coating. Simulated data from the model was agreeing well with experimental values. The developed equations are as follows: