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Frequently Asked Questions

How to calculate a fertilizer ratio?

To determine a fertilizer ratio for a recommendation of 1.5 lb of nitrogen, 0.5 lb of phosphate, and 0.5 lb of potash, divide the weight of each of the three nutrients (1.5 lb, 0.5 lb, 0.5 lb) by the nutrient with the lowest weight (0.5 lb). Thus, the fertilizer ratio that best fits this recommendation is 3-1-1 .

What does NPK ratio mean?

The NPK ratio is basically a measure of the concentration of 3 key nutrients—nitrogen, phosphorous, and potassium—that can be found in fertilizers. There really is no ideal fertilizer and every marijuana grower has his own theory, but, as a general rule of thumb, a 7-5-5 ratio works for vegetative growth.

What does NPK stand for on a fertilizer label?

NPK stands for "nitrogen, phosphorus, and potassium," the three nutrients that compose complete fertilizers. You may encounter these letters when reading the contents printed on bags of fertilizer. The description of the fertilizer may not expressly say "NPK," but you will at least see a series of three numbers.

What do the three numbers on fertilizer mean?

All fertilizer labels have three bold numbers. The first number is the amount of nitrogen (N), the second number is the amount of phosphate (P2O5) and the third number is the amount of potash (K2O). These three numbers represent the primary nutrients (nitrogen(N) - phosphorus(P) - potassium(K)).


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