Ayeni, L.S. and Ezeh, O.S.

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A Screen-house experiment was carried out at Adeyemi College of Education, Ondo Southwest Nigeria to evaluate the effect of NPK 20:10:10 (NPKF), organic (OF) and organo-mineral (OMF) fertilizers on soil chemical properties, nutrient uptake and yield of tomato. The treatments used were organic and organo-mineral fertilizers applied the same rates of 0, 12.5, 25 and 50 g/plant and NPK 20:10:10 fertilizer applied at 2 g /plant. There were eight treatments replicated six times and arranged in a completely randomized block design. The result showed that OF, OMF and NPKF had significant effect on agronomic parameters and nutrient uptake of tomato. The increase in tomato fruit weight were in the order of OMF25g > OMF50g >. OMF12.5g > OF12.5g > NPKF > OF50g > control > OF25g. Application of OMF and OF fertilizers at all rates significantly increased N, P and Ca concentration (p>0.05) in tomato plant as well as soil nutrients showing that organic fertilizers had better residual effects on soil chemical properties. The order of increase in N concentration in tomato plants were OF 25g > OMF 50g > OMF25g > OMF12.5g > OF50g > NPKF > OF25g > control. Organomineral fertilizer applied at 25g recorded highest leaf P concentration (0.06g) while control recorded least P (0.02g). OMF applied at 12.5g/plant recorded highest K (4.53g) in tomato leaf while control recorded least K (3.07g). Compared with control, all the treatments significantly (p>0.05) increased soil pH (except NPKF), OM, total N, Ca, Mg, K and CEC. Key words: yield, leaf area, branches, micronutrients, macronutrients