Soil Health Card to Biofertilizer (2026): What Low, Medium or High Phosphorus Means for Mycorrhiza and NPK Consortia

Short answer: If your Soil Health Card shows low or medium available phosphorus (under 25 kg/ha by the Olsen method), mycorrhiza VAM is worth buying. If it shows high phosphorus (above 25 kg/ha), skip mycorrhiza this season and spend on nitrogen-fixing and potash-mobilising biofertilizer instead. Powder VAM costs about ₹250 per acre at 100 g per acre (₹2,499 per 1 kg pack), so the test result decides whether that ₹250 is useful or wasted.

Mycorrhiza helps most where phosphorus is present but locked; it helps least where the soil is already rich in soluble phosphorus.

Why the phosphorus line decides the purchase

Most Indian soils have plenty of total phosphorus, but much of it is fixed to calcium, iron or aluminium and is unavailable to roots. Commonly cited agronomy figures put crop recovery of applied phosphate fertilizer at only about 15 to 25 percent in the first season. Mycorrhizal fungi extend the root's reach through fine hyphae and help the plant reach phosphorus that roots alone cannot. This is why VAM pays off in low and medium phosphorus soils, and why high soil phosphorus tends to suppress root colonisation, so the product adds little.

Reading your Soil Health Card

The standard Soil Health Card ratings for available phosphorus (Olsen method) are:

• Low (below 10 kg/ha): Strongest case for mycorrhiza. Use VAM together with a phosphate-solubilising biofertilizer, and do not cut your basal phosphate fertilizer sharply in the first season.
• Medium (10 to 25 kg/ha): Good case for mycorrhiza. This is where farmers most often see room to trim DAP gradually over two or three seasons, guided by a repeat soil test.
• High (above 25 kg/ha): Skip mycorrhiza. Put the money into an NPK consortia product for nitrogen fixation and potash mobilisation, and avoid adding more phosphate than the crop removes.

Also check organic carbon. Soils under 0.5 percent organic carbon have a thin microbial community, so any live biofertilizer needs organic matter such as compost or FYM to establish.

Which Orgogrowth product fits which result

Mycorrhiza VAM powder (1 kg, 6000 IP/gm, ₹2,499) is the budget route for low or medium phosphorus fields. At 100 g per acre, one pack treats about 10 acres. For farmers who fertigate through drip and want a ready liquid, Mycorrhiza VAM Liquid (50 L drum, ₹5,800 incl. GST, about ₹116 per litre) is the alternative. For fields where the card also shows low nitrogen or potash, NPK Consortia (50 L drum, ₹4,699, about ₹94 per litre) combines Azotobacter, phosphate-solubilising bacteria and potash-mobilising bacteria. Follow the dose printed on the label for your crop.

A practical checklist before you buy

1. Take the latest Soil Health Card or get a fresh test, ideally within the last two years.
2. Note available phosphorus, organic carbon and pH. Mycorrhiza and most consortia work best between pH 6 and 8.
3. Apply biofertilizer at sowing, planting or the first irrigation, and keep it away from fungicide seed treatments for a few days, since fungicides can kill the fungi.
4. Cut chemical phosphate gradually, never in one step, and retest after the season.

Frequently asked questions

Does mycorrhiza work if my phosphorus is already high?

Very little. High soluble phosphorus reduces the plant's need for the fungus, so colonisation stays low. Save the money.

How much does mycorrhiza cost per acre?

With Orgogrowth powder at 100 g per acre, roughly ₹250 per acre (₹2,499 per 1 kg pack that treats about 10 acres).

Can I stop DAP completely after using mycorrhiza?

No. Reduce it step by step over seasons while watching soil test values and crop response. Biofertilizer supports fertilizer; it does not replace it overnight.

Should I use mycorrhiza and NPK consortia together?

Yes, they target different things: VAM improves root reach and phosphorus uptake, while NPK consortia supplies nitrogen fixation and phosphate and potash mobilisation. Orgogrowth also sells a combined NPK+VAM Consortia.

Does the same advice apply to all crops?

The soil-test logic applies broadly, but crops such as cabbage and cauliflower (Brassicas) do not form mycorrhizal associations, so VAM is not useful for them regardless of the test.

Orgogrowth India supplies FCO 1985 compliant biofertilizers. Results vary with soil, crop and management; always follow label directions.