Like the title says I am having an issue with brown spots between leaf veins on the newer fan leaves on my plants. What type of medium; soil or hydro? Soil What brand and type of soil? Fox farm Ocean, with some cow manure, pear lite, worm castings Indoors or outdoors? indoor What strain? maui waui How old are the plants? second week of flower What type of lights and how many watts? Electric sky 300 in a 2x4 tent How far from the lights? about 2 and a half foot. What is your watering frequency and source of water? RO water with half doses of organic blue planet grow nutrients, with liquid seaweed, ph'd to 6.7-6.9. watering about a gallon or so per plant every 2-3 days. What, how much and when was it fed? NPK? What is the medium/runoff pH and PPM if in hydro? What are the temps and humidity in the room? temp is 70-72 lights off and 80-84 when on. What size pots? 7 gallon fabric pot Any bugs? Look real close. no pests Any other pertinent info?. Just did a straight RO flush on the plant ph'd to 6.8 with no nutrients, in case if its nutrient lockout. Not sure what else to try. I am worried because I am noticing its happening to most of the newer leaves and I see it spreading to more of them
It’s phosphorous deficiency mate. I’m a hydro grower so no idea how you go about fixing it or why it happened but that’s what the symptom is.
I had the same problem in my Northern light. I was growing in coco and I wasn't watering until runoff properly for a while and it got a nute lockout, I made a 400ppm solution and flushed the plant until the ppm on runoff was 500ppm from 1200 (5 week of flower) this fixed the problem straight away for me. Also ph from 6.2 to 5.8 Sent from my Mi A3 using Grasscity Forum mobile app