Hello, so I have 1,5 month old auto, Biodiesel mass. Growing it in a mix of coco, cactus soil, classic potting soil for indoor plants, perlite and keramzite, Fertilized it first in 2. or 3. week. I added about 20 grams of granulated NPK(its bio NPK, with guano, smells like s..t and p..s together), she was a little bit overfert but then it was good. Problems started about three weeks ago, with greenish dots on lower fan leaves(which went brown), then it continued with browning of leaves blades(all lower leaves). I started a discussion and the idea was that the plant is overfertilized and ph is low. So i flushed it about week ago... didnt fertilized it since, and sprayed leaves with Mg solution. But now i have got this purple/red areas on leaves and all leaves are getting yellow from bottom. I don´t know what to do... Flush pH is 6.3, temp 28C, sprayed it with solution of bioNPK/superP/Mg about two days ago. The whole plant looks like trees in autumn. Sorry for my english.
I believe thats one or multiple deficiencies, probably magnesium. sounds and looks like youve contained the problem though, especially in the last pic I believe the leftover green portions of the leaf have stopped yellowing. Id just pick off the large yellow fan leaves and keep it growing for about a month longer.