If I live in the eastern United States, what percentages of N-P-K fertilizer should be used during spring, summer and fall, and how often should I use it?
Md Ariful Islam
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Dr. Md Rushad Rahman
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It depends on what crops you are growing and how much phosphorus and potassium are already present in the soil. The best thing to do is contact your local county extension agent to inquire about submitting a soil test.
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