Leaf burn

Hey pal after looking thru ur diaries and pics. Your big bud is just alone for pre flower. Its a stim alone for tat process it hold no HIGN PK but rather a mix 9f stims to help more stigmata.. so big bud needs to be dropped as it takes 4-5 wks to flush tat from ur bud or you'll hv a manky taste. When you go into flowering you pull back from a more grow NPK to a bloom npk.. I see you're using coco..so your PH should not exceed 6.2. 5.8 is optimal for coco.. also weekly flushes are required with coco. Upon flushing you put I. 1/3rd of water of the pots volume, catch as much run off as you can. Your ppm should be lower than ur ppm input..so if you put in 600ppm a day you need to follow up with same amount of water 12hrs later. Ppm intake and outside checks are one of the most important things when doing coco grows and it shows if the plant is taking in nutrients. So, at your end of the week. The last 800ml 600ppm feed them 800ml of follow up water 12 hrs later The next feeding day then you put 1/3 of the volume of the pot, u should be looking to see 2-300ppm even u really have it dialed in you should just have enuf nutrients in ur run off to keep it going until your next feed. If your are seen an increase on your weekly flush test. This means your .nute/water ratio is way off.. and ur plant has too much nutrients and therefore far from an optimal grow performance. There's much more to it but these are the very basics with coco growing. Also organic nutrients work best in a soil organic set up. And when u hv a setup like that my alga grow ph tat goes into my soil is 4.5-4.8, the right sub needs the right nutrients for the best performance. I do use atami coco nutrients in soil but as they're organic the PH must match the optimal soil ph of 6.5-6.8