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	Micronutrients/ Trace Elements
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
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)	% 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	% 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