Nitrogen, Phosphorus, Potassium + Macronutrient and Micronutrient Values for Soil Amendments

Fertilizer Analyses of N-P-K

Before scattering amendments like magic fairy dust all over your garden, try Fedco’s Soil Testing & Recommendation Service !

We’ll translate your test results into a clear plan to correct deficiencies and imbalances.

Fertilizer analyses report levels of soluble nitrogen (N), phosphate (P) and potash (K) available to your plants in the current growing season. Additional nitrogen, phosphorus and potassium contained in the material may become available at varying rates over time. Release rates depend on many factors, including particle size, temperature and microbial activity in your soil.

Plant and animal byproducts provide a natural source of plant nutrients and support the organic principle of recycling natural resources within agricultural systems, putting “waste” to productive use, reducing landfill space, and preventing contamination of our waterways. Unlike synthetic fertilizers, they provide tasty nibbles for soil life, and a well-fed microbial population will help to unlock the nutrients already held in your soil.

The analyses we provide for our plant and animal meals, and for the mixes we produce in-house using those products, are not guaranteed analyses. These natural products are highly variable. These analyses represent Maine state lab tests performed on the most recent lot we purchased, and we keep these numbers updated on our website as fresh lots come in and new tests are performed. The numbers here do provide some guidelines for determining the approximate ratios of nutrients in plant and animal meals.

Click here to download this information as a PDF.

Animal-based Fertilizers

Amendment Avg spreading rate (pounds per 1000 sq ft) % Nitrogen % Phosphorus % Potassium % Calcium % Magnesium % Sulfur Micronutrients/ Trace Elements % Boron % Silicon Dioxide Improves Soil Texture/ Structure
Blood Meal 20 13
Bone Char 15 16 30
Feather Meal 20 13
Fish Bone Meal 20-35 6.9 11.9 0.8
Poultry Manure Compost 35 5 4 3 9
Crab Meal 60 4 4 18
Worm Castings 100 0.5 0.5 0.3 YES
Superworm Frass 65 2 2 2

Plant-based Fertilizers

Amendment Avg spreading rate (pounds per 1000 sq ft) % Nitrogen % Phosphorus % Potassium % Calcium % Magnesium % Sulfur Micronutrients/ Trace Elements % Boron % Silicon Dioxide Improves Soil Texture/ Structure
Alfalfa Meal 20-30 2.5 0.4 3.3
Kelp Meal 7-14 trace trace 1.7 1.9 0.8 2.7 YES trace
Neem Cake 10 6 1 3
Karanja Cake 10 4.6 0.9 1.3
Soybean Meal 40 7 1.5 1

Mineral-based Amendments

Amendment Avg spreading rate (pounds per 1000 sq ft) % Nitrogen % Phosphorus % Potassium % Calcium % Magnesium % Sulfur Micronutrients/ Trace Elements % Boron % Silicon Dioxide Improves Soil Texture/ Structure
Aragonite 10 13.2
Calcitic Lime MUST test soil! 35 2
Dolomitic Lime MUST test soil! 22 11.3
Gypsum 25-50 21 16 YES
Wollastonite 50-80 48 52
Azomite 4-7 0.2 1.8 0.5 YES
Borax Solubor® MUST test soil! 20.5
BrixBlend Basalt 50-500 6.6 trace YES 49.3 YES
Epsom Salts 8 9.8 12.9
Granite Meal 50-100 5 YES YES
K-Mag 10-20 22 10.8 22
Hum-Amend Max 4-7# for improved nutrient uptake YES
Sulfate of Potash 5-10 50 17
Sulfur 1# for S deficiency; or test soil for pH 90
Fertoz Rock Phosphate 50 6 30 10
Tennessee Brown Rock Phosphate 75 6
ZeoMax Garden Aid 150-200 YES

Mixes

Amendment Avg spreading rate (pounds per 1000 sq ft) % Nitrogen % Phosphorus % Potassium % Calcium % Magnesium % Sulfur Micronutrients/ Trace Elements % Boron % Silicon Dioxide Improves Soil Texture/ Structure
Sleepytime Garden Blend 100 2 2.5 1.6 YES YES
Vegemighty 100 3.4 2.2 3.5 YES
Gungnir Asparagus 45 2 5 7
Turbo-Tuber 45 7 2 9 2 3.5
3G Greener Garlic Grower 100 3 3.5 3.5
True Love Rose 50-60 2.5 6 3
CannaDiesel 15 lb per plant 0.8 2.2 0.2 6.3 trace 0.1 YES 5.3 YES
NutriVeg 50 5 4 4 5 YES
Tomato Sauce 60 3 4 6.1 5.8 3 6.2 YES 8.7