The best biofertilizer for mustard (sarson / rai) is liquid NPK Consortia at 1 litre per acre plus Mycorrhiza (VAM) at 100 g per acre, applied at sowing in October–November. Together they cut DAP and urea by 25–40%, improve siliqua fill and oil content, and lift yield 10–15%. NPK Consortia costs ₹4,699 per 50 Ltr drum; VAM Powder 1 kg is ₹2,499 for ~10 acres. Full rabi dosage, timing and FAQ inside.