Ashes from natural wood chip under fireplace (ID:321)

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Input material
Shredded wood
Nutrient content info

0.0 N%, 0.4 P2O5%, 0.9 K2O%, 0.4 MgO%

Status
Advanced development stage
Application dose
2,5 t/ha every 3 year
Type of farming
conventional
low input
organic
Keywords
mineral fertilizer
phosphates
powdered material
nutrients recovery
liming
Product description

The ash collected at the outlet of the boilers can come from different fractions: sub-fireplace or flying (from dust removal and smoke filtration). The ash under the fireplace is generated in larger amounts and concentrates the non-combustible minerals of the wood (1 to 2% of the initial mass of the wood). With significant levels of lime, magnesium, potassium and phosphorus, this fraction generated up to 95% of the total ash production presents valuable agronomic advantages. A return to the ground allows benefits from the fertilizing and liming value of these ashes. They generally contain phosphorus around 20 to 50 g P2O5/kg of raw material, and potassium around 80 to 100 g K2O/kg. Cationic nutrients Ca, K and Mg in ash are readily available to potentially available for cultivation. With a neutralizing value sometimes reaching more than 50%, they are a liming material that can increase the pH by 1 point after a cumulative application of 7 to 8 t/ha. The potential risks linked with this use are due to the presence of metal trace elements (MTE), at higher or lower concentrations, depending on the origin of the wood and the combustion technic. To limit these risks: choose ash from natural wood (unadjusted) and from unpolluted media. Under these conditions, wood ash represents a substantial saving for the farmer, from 100 to 150€/t.

Basic information

Vendor:
  • Name: Energie Bois Sud Cornouaille
  • Contact: Alain RICHARD
    Country:
    France
    Product main category:
    Ash
    Product subcategory:
    Ash

    Languages

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    Practice Abstract:
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