Looking for help on why one of my plants leaves may be yellowing. They were started one week apart, in the same soil, same lights, same tent, temps, etc. Not sure whats causing the issue.
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Potassium
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To much or to little potassium? What’s the best solution to fix this? Tia
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What medium and fertilizer are you using Grow Bro? Input and run off PH if using synthetic fertilizer?? 
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Fox farm happy frog and Grow time fertilizer- 19-5-20. I am watering with rain water not tap water.
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Gotcha, soil PH range is 6.3-6.8 with 6.5 being optimum. Do you know the the run off PPMs and PH?? For soil grows it’s best to follow a drench to drought routine with liberal run off on feed days. The run off acts like a soft flush/rinse of the accumulated salts from the previous feeding. These salts can tank the root zone PH and prevent nutrient uptake
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Ph is sitting at 7 so now I know that’s my issue. I’ll do a complete flush and go from there. Thank you for the great advise.
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Potassium is available in a wide range
Judging by the fertilizer the K is a 20. This makes me ask, what is you calmag dosing rate and schedule?
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Oh boy… whats that? Just a backyard closet grower here. Lol. Learning as I go.
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Calcium and magnesium, very vital secondary nutrients
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Should i cut the yellow leaves off so the plant doesn’t focus on repairing those?
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Leave them if they’re not necrotic, they’ll recover
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