Monoammonium Phosphate 12-61-0

Monoammonium Phosphate 12-61-0 Specification

High-analysis phosphate with a small nitrogen component; mildly acidic in the seed zone. The declared analysis and supply detail for Monoammonium Phosphate 12-61-0 are set out below. A Certificate of Analysis is issued on request against the batch you actually receive.

Nutrient Content of Monoammonium Phosphate 12-61-0

One tonne of Monoammonium Phosphate 12-61-0 supplies 120 kg of nitrogen (N), 610 kg of phosphate (P₂O₅) and 0 kg of potash (K₂O) — a total of 73 nutrient units per 100 kg.

Nutrient supplied at different rates

What one hectare actually receives at a given spreading rate of Monoammonium Phosphate 12-61-0. Use it to work back from a nutrient target to a product rate.

Indicative conversion only. Set application rates against a current soil test and confirm them with a qualified agronomist.

Where MAP 12-61-0 Is Used

MAP goes in at sowing. Phosphorus decides what a young root system can do in its first few weeks, and it will not move to the plant later, so the decision is made at planting or not at all.

Starter fertiliser at sowing

Where a large amount of phosphorus has to go into a narrow band, the highest analysis wins — you get the phosphorus in without filling the band with carrier.

Alkaline and calcareous soils

This is where MAP earns its premium over DAP. On high-pH ground, phosphorus locks up with calcium quickly, and the acidic reaction around a dissolving MAP granule keeps it available to the plant for longer.

Placement close to sensitive seed

MAP does not release free ammonia as it dissolves, which makes it the safer of the two phosphates to place near small or sensitive seed. Rates still matter — confirm safe placement with your agronomist.

Low-phosphorus and phosphorus-fixing soils

Soils that tie phosphorus up need it placed, concentrated, and in a form that stays available. All three point to a banded high-analysis phosphate.

As the phosphorus base of a high-analysis blend

Because MAP carries little nitrogen and no potassium, it leaves room in the blend for you to set those independently — useful when the soil test calls for an unusual ratio. Tell us the analysis and we will blend to it.

The Acid Reaction Around the Granule

Two fertilisers can supply the same phosphorus and behave quite differently once they are in the ground, and with the phosphates the difference is pH — not of your paddock, but of the few millimetres of soil around each dissolving granule.

• MAP dissolves to an acidic solution. On alkaline and calcareous soils, that local acidity slows the reaction between phosphorus and calcium that would otherwise lock it away, so more of what you applied reaches the crop.
• DAP dissolves to an alkaline solution and releases free ammonia as it does. That is harmless in most situations and useful as a starter nitrogen charge, but it is what makes DAP riskier in direct contact with small seed.

On acidic and neutral soils the difference narrows and the decision usually comes down to price per unit of phosphorus and whether you want the extra starter nitrogen. On alkaline ground, MAP is worth the premium.

MAP or DAP?

Send us the soil test, particularly the pH, and we will tell you which of the two the numbers call for.

Packing and Quantities

Monoammonium Phosphate 12-61-0 is supplied in bulk, in 1,000 kg and 500 kg bulka bags, and in 50 kg and 25 kg bags. Minimum order is 10–25 MT, depending on the product and the destination. Packing formats, 20ft container loading figures, and bagging and marking are set out in full on our Delivery & Freight page.

Handling and Storage

Store Monoammonium Phosphate 12-61-0 dry, off the ground and out of direct weather. Nitrogen and ammonium-based fertilisers draw moisture from the air and will cake if left exposed — full handling and storage guidance is on the Delivery & Freight page.

MAP 12-61-0 — Common Questions

How much phosphorus is in a tonne of MAP 12-61-0?

610 kg of phosphate as P₂O₅, plus 120 kg of nitrogen. At 100 kg per hectare that is 61 kg of P₂O₅ and 12 kg of N per hectare.

Is MAP better than DAP?

Neither is better in general. MAP carries more phosphorus per tonne and reacts acidic around the granule, which suits alkaline soils and placement near sensitive seed. DAP carries more nitrogen and reacts alkaline, which suits acidic and neutral soils and gives a useful starter nitrogen charge. Your soil pH usually decides it.

Can MAP be broadcast on an established crop?

You can, but it achieves very little. Phosphorus binds within centimetres of where it lands and will not travel down to an existing root system. Phosphorus is a sowing decision.

Is this the soluble grade for fertigation?

No. This is granular MAP for soil application. Fully water-soluble grades are made for fertigation and are a different product — tell us if that is what you need and we will confirm what we can supply.

Does MAP acidify the whole paddock?

No. The acidity is local to the dissolving granule and short-lived. Sustained soil acidification comes from repeated ammonium nitrogen use — see ammonium sulphate for where that genuinely matters.

Monoammonium Phosphate 12-61-0 Data Sheet

A Certificate of Analysis for your delivered batch and the Safety Data Sheet are both available on request. The analysis in the data sheet is the nominal specification; where a Certificate of Analysis is issued for a batch, that certificate governs.

Related Reading

Enquire About Monoammonium Phosphate 12-61-0