Potassium deficiency?

Badfinger

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What I am really looking fore, is to find out if I am reading my leaves correctly. Would you say I am right or wrong thinking it's a Potassium issue?

Problem: After watering my plants with 1/3 the recommended dosage of Epsom Salt, one plant started getting brown leaves. I suspect a Potassium lockout/deficiency.

Medium/grow method: Coast of Maine soil

Feed: and supplements used: None at the time of deficiency

water source: Tap 65ppm/ 6.4ph

Strain/age: Fastbuds Orange Sherbet/ 3 weeks old

light used: 5-100watt Groplanner boards dimmed to 65% @ 22" height

Climate: 81 day/71 night 55% humidity

Additional info:
3 plants showed what appeared to be a very slight Mg deficiency, treated with 1 teaspoon Epsom salt to a gallon of water. I have since then, given them their first dry feed. I do not plan to do anything at this time to counter these symptoms, in hope's that the feeding and a few weeks of watering might hopefully fix the issue.
 

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It does seems a potassium deficiency to me as well.
As you said, keep giving nutrients and see what happens, leavs that have been damaged will not recover but new ones will.
 
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