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| Hi folks. I'm lucky to be in an area that has wood ash bulk for free. 2.5 tons of the ash in this area is = 1 ton of lime. I started with the ash last year and with todays prices of lime spread in this area it wasn't to soon.
Table 1. Range in elemental composition of industrial
wood ash samples and ground limestone.
Element Wood Ash* Limestone
Macroelements Concentration in %
Calcium 15 (2.5-33) 31
Potassium 2.6 (0.1-13) 0.13
Aluminum 1.6 (0.5-3.2) 0.25
Magnesium 1.0 (0.1-2.5) 5.1
Iron 0.84 (0.2-2.1) 0.29
Phosphorus 0.53 (0.1-1.4) 0.06
Manganese 0.41 (0-1.3) 0.05
Sodium 0.19 (0-0.54) 0.07
Nitrogen 0.15 (0.02-0.77) 0.01
Microelements Concentration in mg/kg
Arsenic 6 (3-10) .
Boron 123 (14-290) .
Cadmium 3 (0.2-26) 0.7
Chromium 57 (7-368) 6.0
Copper 70 (37-207) 10
Lead 65 (16-137) 55
Mercury 1.9 (0-5) .
Molybdenum 19 (0-123) .
Nickel 20 (0-63) 20
Selenium 0.9 (0-11) .
Zinc 233 (35-1250) 113
Other Chemical Properties
CaCO3 Equivalent 43% (22-92%) 100%
pH 10.4 (9-13.5) 9.9
% Total solids 75 (31-100) 100
* Mean and (Range) taken from analysis of 37 ash samples
Check around your area for any power plants that burn wood. New regulations are for some coal plants to use ??% of wood along with coal. Don't know if it will be mixed or at times burn straight wood. We don't use coal ash on farm land.
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What kind of fertilizer is in wood ashes?
