I posted almost this same problem(Potassium/Phosphorus deficiency),but the plant was in FLOWER.My grow is perpetual as I crop-out ever two weeks.Now this is showing up in my Veg.Not tooooo serious as of yet,but when this problem showed up in my flowering room it had come on pretty damn fast(week 5ish) Now I am getting a really low pH runoff in my Coco.I will water at 6.0 then the runoff is 4.7-4.9...WTF. I am starting to see a Phosphorus deficiency in veg.I had a BAD Phosphorus deficiency/lockout in flower recently but I had contributed it to excessive salt build-up.But now my drain to waste system is dialed in so I fugured the problem would go away. Why is this happening,and how can i correct it.I am stumped as to why my pH is fluctuating sooooo much in my Coco.I understand that my pH will change,but going to the high 4's while the plant is feeding will cause all sorts of problems. What type of medium?Coco What brand soil?Botanicare Indoors or outdoors?Indoor What strains?AK-48,Jack Frost,TrainWreck How old are the plants?30ish days veg What type of lights and how many watts?HPS 1600w(1x1000/1x600) How far from the lights?18 inches Watering frequency and source of water?every 2-3 days/city water How much and when was it fed?800-1000ppm What is the medium/runoff pH?6.0in 4.7-4.9 out What are the temps and humidity in the room?80-85 deg/50-60rh What size pots?10gal smart pots Any bugs? no Any other pertinent info?I like the Red and Green gummy worms the best Nutrients are: Botanicare Pure Blend Pro Botanicare Pure Blend Organic Compost Solutions Botanicare Liquid Karma Bio Bizz Root Juice Great White Hyrgozyme
I would definitely raise that pH going in! I'm on my first grow(soil) and haven't done any research on coco but it seems like you should raise it up a good bit. I'd try 7.4-7.6 pH range going in and see what that runoff is then just go from there. But IDK for sure. What little I have heard about coco is that it's supposed to be neutral. Maybe it just needs a good flush to have a new slate to work with.