Appendix A: Conversion Factors

Approximate Densities

Animal manure

Horse: 40 lb/bu, or 800 lb/cubic yard

Broiler: 50 lb/bu, or 1000 lb/cubic yard

Other manures: 80 lb/bu, or 1700 lb/cubic yard

Compost: about 50 lb/bu, or 1000 lb/cubic yard

Hay: a bale 14 inches by 20 inches by 32 inches weighs about 40 lbs

Sawdust: 15 lb/bu, or 300 lb/cubic yard

Wood ashes: 30 lb/bu, or 600 lb/cubic yard

Peat moss (compressed): 25 lb/bu, or 500 lb/cubic yard

Soil, 6-8 inches deep (plowdepth layer): 1000 tons/acre, or 50 lb/sq ft

Fertilizer Units

1 cubic yard = 21.7 bushels

1 bushel = 8 gallons (dry) = 9.3 gallons (liquid)

1 acre = 43,500 sq ft

To convert from percent nutrient content to lbs/ton, multiply by 20

example: 1% = 20 lbs/ton

To convert from percent to ppm (parts per million), multiply by 10,000

example: 0.01% = 100 ppm

To convert from ppm to lbs/ton, divide by 500

example: 10 ppm = 0.02 lbs/ton

To convert from ppm to lbs/acre, multiply by 2 (for soil of average density)

example: 50 ppm = 100 lbs/acre

1 lb Calcium (Ca) = 1.40 lbs calcium oxide (CaO)

1 lb Calcitic limestone (CaCO3) = 0.56 lbs calcium oxide

1 lb Magnesium (Mg) = 1.66 lbs magnesium oxide (MgO)

1 lb Phosphorus (P) = 2.23 lbs phosphate (P2O5)

1 lb Potassium (K) = 1.20 lbs potash (K2O)

© 2013 Robert Parnes

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