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Help on feeding - Post-nitrogen toxicity


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I am in my third week of flowering and currently recovering from a slight nitrogen toxicity.

I have a fertilizer with and N-P-K rating of 4-12-4 that I would like to use to get more phosphates in the soil.

After I have finished feeding it regular nutrient free water for a week, Will the 4% nitrogen in the nutrients cause the toxicity to start Again? causing more clawing, airy buds ect.

What is the nitrogen content for a normal feeding at the 4th week of flowering?
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