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Approximate NPK added by 4000 lbs ≈ 1 inch material/1000 sq. ft.
Material N P2O5 K2O
Manure compost1 40 15 40
Yard compost2 58 8 12
Green/food compost3 15 9 30
Dead leaves4 40 9 18
Dead pine needles 18 4.8 1.2
Alfalfa pellets 120 40 80
Annual vegetable harvest lb/1000 sq. ft5 2.3 0.5 2.7

Sources:

1. MSU, 2. Maryland Urban compost LeafGro and SmartLeaf, 3. Waste Resources Action Programme of Wales  4. Heckman and Kluchinski 1996, 5. Univ. Mass., Michigan State, Oregon State, Morris et al. 2007

 

Approximate NPK of soil amendments, as % of weight (the 'grade' listed on fertilizers).
Material N P2O5 K2O
Manure compost 0.01 0.0037 0.01
Yard compost 0.0145 0.002 0.003
Green/food compost 0.0037 0.002 0.0075
Dead leaves 0.01 0.0023 0.0046
Dead pine needles 0.0045 0.0012 0.0003
Alfalfa pellets 3 1 2
Bone meal 3.5 17 0
Blood meal 12 0 0
Brewery grain (wet) 0.9 0.5 0.05
Canola meal 6 3 1
Wood ash (unleached) 0 1.25 2
Coffee grounds (dry) 2 0.36 0.67
Urea (chemical fertilizer) 46 0 0
Worm castings highly variable and its not about NPK

Visit our Soil Sampling website for more information.