Contents of fertilizers are expressed as fertilizer grade or fertilizer analysis.
Fertilizer grade indicate the guaranteed minimum of the active ingredients (N, P205, K 20) in the mixture.
It is expressed as a percentage on a weight to weight basis or percentage by weigh
Example 10:20:o means for every 10kg of the mixture there are 10kg of nitrogen, 20kg of P10 5 and okg of K20.
lemass answered the question on March 15, 2019 at 19:36
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