Just put plant into bloom 1 week ago. The feeder leaves main vein is brown and leaves are starting to drop off. The feeder leaves are from the middle down being affected. I beleive this is this is a potassium deficiency? Sorry waiting for a camera to send pics.
Thanks for that link I have read the info. But still have a question on one section.
Quote from link.
Here are a few pictures of ph spotting before nutrient lockout occurs. The last pic is shown is high ph with the twisty leaves. Note the edges are brown, this is a potassium deficiency that is caused by ph lockout.(Sometimes this gets confused with a nitrogen toxicity, so always keep your ph in check and test it often!)
Do I need to add potassium or flush for two days and then add potassium?