There is an urgent need to maximize crop productivity of organic farming systems. For this purpose, a field experiment was carried out to evaluate the efficacy of modern enriched organic manures as compared with absolute organic manure and organic-based mineral manures application. Significant improvement in the quality of enriched manure (i.e. C/N ratio and nutrients content) was recorded following the application of mineral additives (rock phosphate and feldspar) and bio-inoculants (nitrogen fixing and phosphorus and potassium dissolving bacteria). Crop productivity was enhanced by modern enriched organic manures as compared with absolute organic manures (125.8 vs. 82.4 g/plant). Meanwhile, the organic-based mineral manure produced the highest yield (132.7 g/plant). Significant increase in N, P and K concentrations were recorded in fruits of plants grown in the modern enriched organic manures as compared with those grown in the absolute organic manure. Likewise, the organic-based mineral manure was the superior treatment on maximizing NPK utilization by cucumber plants. A pronounced reduction in nitrate accumulation was obvious in cucumber fruits grown in the modern enriched organic manure as compared with the organic-based mineral manure (33.1 vs. 66.3 mg kg^-1). Increasing the combination level of raw rice straw in organic manures (from 0 up to 75%) was associated with increasing C/N ratio, minimizing nutritive value of compost, reduction in cucumber productivity and alleviation of nitrate accumulation in fruits. Finding from this research is opening new prospective for the mass production on the commercial level of the modern enriched organic manures in organic farming systems.