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Soil Growing Media - Peat & Lime Requirements

Developed by Muhammad Marrush, Shadi Atallah, and Mark Bell - International Programs Office, UC Davis, Oct 2007 "Peat is limed to neutralize the acids in the peat. An increase in pH increases the peat cation exchange capacity. Lime requirements depends on? 1. Acidity and target pH. The lime requirement depends on the amount of acid in the peat (initial pH) and on the target pH (generally between 6 and 7). 2. Long term liming effect More lime is required for a longer lime effect. Limestone (calcium carbonate) dissolves slowly and can therefore be used in relatively large quantities. Even large amounts of limestone do not increase pH excessively and pH generally remains between 6 and 7. 3. Type of peat. The lime requirement of sphagnum peat is often about 3 to 4 kg per m3 peat (approximately 5% of the dry weight of peat), although more (e.g., 8 to 10 kg lime per m3 peat) can be applied as a basal dose. For acid peat humus, the lime requirement may be as much as 10 to 15 kg lime per m3 peat. "

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