Experiments were carried out on clayey loamy alkaline soil to evaluate the agronomic efficiency of fine sized low grade phosphate rock and it was further compared with that of soluble phosphate fertilizer (di-ammonium phosphate). Cicerarietinum, Vignamungoand Vignaradiata were the test crops subjected to treatments of absolute control, di-ammonium phosphate and low grade rock phosphate with varying concentrations of ammonium sulphate or ammonium nitrate to determine the optimum composition of this mixed fertilizer. The experiments were conducted during 2013-2014 in the bid to study the growth rate, biomass and yield of crop. Tests were also performed to determine the residual effects of the fertilizers on the crops. The results indicated that the combined use of low grade rock phosphate and ammonium sulphate or ammonium nitrate at 16 kg N/ha (when compared to di-ammonium phosphate), resulted in a significant growth rate and a better yield in the test crops and was found to be a more attractive management option when compared to di-ammonium phosphate. © 2014, Sphinx Knowledge House. All rights reserved.