Phosphate is an essential nutrient required by crops, as it has a defined role in plant metabolisms such as root development, photosynthesis, nutrient transport.Since a bio-fertilizer is technically living, it can symbiotically associate with plant roots. • Involved microorganisms could readily and safely convert complex organic material into simple compounds, so it can be easily taken up by the plant. • Bio-fertilizers are cost-effective relative to chemical fertilizers.