Understand the Numbers on Fertilizer Bags

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What do all those numbers mean, on fertiliser bags?

Understand the Numbers on Fertilizer Bags

Fertilizers on the market list the proportions of nitrogen (N), phosphorus (P) and potassium (K), always in that order.

For example: a 21-7-14 fertilizer has 21% nitrogen, 7% phosphorus and 14% potassium, or potash.

A 5-10-10 fertilizer contains 5% nitrogen, 10% phosphorus and 10% potash.

Steer manure is typically rated 1-1-1 and is very low in plant nutrients.



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