Onion roots are shallow and sparse, so phosphorus uptake is the bottleneck. Seedling dip with Mycorrhiza VAM plus 1 L/acre NPK Consortia costs roughly ₹344–₹600 per acre.

Onion is one of the most mycorrhiza-responsive crops in India. Here is the exact VAM + NPK Consortia dose, cost per acre and kharif schedule that cuts DAP 40–60% and lifts bulb size.