MAP solution pH: attach the concentration, water and temperature to the result

A MAP solution-pH result should always retain its preparation method. Without concentration, water and measurement conditions, two quoted values may not be directly comparable.

Use the named product’s test definition

The Van Iperen MAP horticultural-grade sheet reports properties for a defined fertilizer. Follow the actual offered grade’s method and specification rather than borrowing a number from another producer.

Record concentration as mass fraction or the exact stated mass-per-volume preparation, water quality, temperature, dissolution procedure and pH instrument calibration. Do not silently treat a 1% solution and a more concentrated stock as the same test. Keep a representative sample and the original result under the site’s quality procedure.

Avoid an agronomic conclusion from the beaker alone

A laboratory pH result does not by itself establish the effect of a fertilizer programme on soil, irrigation water or crop response. Those systems contain additional buffering, nutrients and process conditions. The responsible agronomist should assess the intended use independently.

For an ENVO enquiry, include the actual pH method when it is a purchasing requirement, together with grade analysis and destination. If buyer and supplier results differ, align the method before changing the specification. This makes pH a reproducible quality field without asking it to prove unrelated fertilizer performance.

Related decisions

• MAP 12-61-0: calculate elemental phosphorus and the accompanying nitrogen
• Granular MAP and water-soluble MAP: a shared name does not qualify the grade

Review Monoammonium phosphate (MAP) product identity and purchasing requirements. For the decision above, send ENVO your application, acceptance criteria, quantity and destination. Confirm the offered grade and available documents before ordering.