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What is calcium buffering?

Coir glossary · Updated 2026-09-22

See Buffering. The calcium ion (Ca2+) that displaced sodium and potassium during the buffering process becomes chemically bound at cation exchange sites and is not plant-available. Growers must still supply calcium through their fertigation program. Calcium buffering is the industry-standard post-wash treatment for professional-grade coir substrates.

Calcium buffering: equivalents.

PT: tamponamento com cálcio · ES: tamponado con calcio

On Carve’s coir pith specification, EC is measured and reported per lot (1:5 method): Natural grade typically 0.8–1.5 mS/cm; Washed, EC reduced by freshwater washing; Buffered, washed plus calcium and magnesium treatment. The EC limit is fixed in the customer’s contract (source: Carve Coir Pith specification).

Source: Romero · Cadena. Definition from the Carve coir glossary, where the full source list is given.

Related terms.

Buffering: Chemical treatment of coir pith with a calcium solution — typically calcium nitrate (Ca(NO3)2) or calcium chloride…

Buffered grade: Coir pith that has been washed and then treated with calcium nitrate or calcium chloride to displace bound sodium and…

Cation exchange capacity (CEC): Measure of a substrate’s ability to hold and exchange positively charged nutrient ions such as Ca2+, Mg2+, K+ and Na+.

See also: Coir pith from Brazil: specification checklist · back to the coir glossary.

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About this page. Part of the coir glossary maintained by Carve Biorrefinaria Agroindustrial Ltda, a coir pith and fiber producer in Paraipaba, Ceará, Brazil. Corrections: [email protected].