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All fertilizers have three numbers on the label which indicate the fertilizer analysis, or "percentage by weight" of nitrogen, phosphorus and potassium, in that order.
Therefore, a 50 pound bag of fertilizer labeled 20-10-5 would contain 20% nitrogen (10 pounds), 10% available phosphates (5 pounds), and 5% soluble potash (2.5 pounds).
See the calculations below:
50 pound bag of 20-10-5 fertilizer:
20% nitrogen (.20 x 50 lbs = 10 lbs)
10% available phosphates (.10 x 50 lbs = 5 lbs)
5% water soluble potash (.05 x 50 lbs = 2.5 lbs)
Comes in 50lbs. Bag.
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