N:P:K Analysis of common materials
by Frann Leach
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Organic gardeners make use of a number of different fertilisers. This table gives a typical analysis of their Nitrogen, Phosphorus and Potassium content, together with their speed of action.

Type Action Nitrogen (N) Phosphorus (P) Potash (K)
Dried blood Quick 9-13 0.80 -
Blood, fish & bone Medium 5.1 5 6.5
Bone meal Slow 0.3-4.6 14.1-33.2 1.0
Chicken compost, deep litter Medium 0.80 0.55 0.48
Comfrey compost   0.77 0.29 0.92
Cow dung, strawy   0.54 0.31 0.67
Cow dung, well-rotted   0.59 0.45 0.49
Farmyard manure Slow 0.65 0.23 0.32
Fish meal Quick 6.3-8.9 6.0-8.9 1.0
Guano Quick 15 10 7
Spent hops Slow 4 2  
Hoof & horn meal Slow 6.5-13.2 0.20 -
Kainit Slow     13
Mushroom compost   0.80 0.63 0.67
Rape meal Medium 5 2 6
Seaweed meal Medium 2.88 0.22 2.29
Seaweed, dried Slow 2.88 0.22 2.29
Urine-activated compost   0.80 0.29 0.41
Wool shoddy Slow 12    
©2004 Frann Leach. All rights reserved.

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