Have you measured your ppms in the run off? Also in FFOF I wouldnt go below 6.3 on the ph. 6.5 being the sweet spot. The ph has a tendency to drop out near the end of my grows with FFOF. Let me tag some more experienced growers. @MattyBear@Myfriendis410@AAA@blackthumbbetty
Light is up as far as possible. I’d say 20” above. The brown is on the leafy part not the veins of the leaf. I tried to use half water and half nutes. Wonder if I just locked it out or a nute deficiency because I gave it half nutes too. I was thinking I was having too much run off. I tried cutting it in half.
for sure you will want to get the ph of your soil up as stated above and i would almost bet that you have a manganese lockout due to the ph of your soil being too low. Try watering with 6.9 to even a 7.0 ph level in your water next watering and make sure you find some manganese to add to your water.
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And as a reminder, those will always been on the damaged leaf. It won’t go away when the problem is fixed. Focus on the new growth for further info on how the plant is doing.
Get a ppm/tds meter also. Other than that your ladies look great
Thanks for that info. I was hoping it went away. I watered and feed full nutes this morning. They don’t seem as dry. Lower leafs seem fine. Thanks again for all the ideas. Thought I had posted this last week. Sorry. I had to leave town for a week and had a friend feed one day, water one day, then nothing on next day. I came home last night and seems like leaves are drying to a crisp at the top of the white widow. Two AK 47s and a second white widow has some deficiency. I had only watered one round with half nutes and half water. Is this nute lockout or a deficiency. I ordered a ppm meter it’s not here yet. I also flushed each plant today with 2gallons of PHed water per 5gallon pot. Will this help?