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In every fertilizer, the order is Nitrogen-Phosphorus-Potassium (N-P-K). In a 15-20-10 fertilizer, what does the 20 stand for?

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1. In every fertilizer, the order is Nitrogen-Phosphorus-Potassium (N-P-K). In a 15-20-10 fertilizer, what does the 20 stand for?





 
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