Brown spots

Your nutrient balance seems off when looking at the NPK ratios. I've gone through your feeding schedule and compared it with your other grow diaries, and honestly, I'm having trouble making sense of your current approach. Here's what stands out to me: You're running a slow-release solid fertilizer that's supposed to last the entire grow cycle (at least according to the manufacturer), but at the same time you're adding chemical fertilizers from other brands. What's confusing is that your past grows using just liquid nutrients actually showed really good results. Mixing systems like this tends to create problems because each feeding method really needs its own complete approach. When you combine different regimens, you're inviting unpredictable outcomes. Maybe you moved away from what was working to experiment with something new, or maybe you're trying to fine-tune things - but right now it's creating complications. About your current issues: The yellowing leaves clearly show nitrogen (N) deficiency, though this isn't too concerning for flowering stage - you'll want to correct it but don't overdo it since the plant's N needs are much lower now than in veg. These symptoms suggest it's still in early stages. The brown spots and purple stems indicate phosphorus (P) deficiency though, which could become a real problem during flowering - those larger brown spots typically appear when the deficiency is already moderately advanced. Here's the crucial part: Before you try fixing these deficiencies, you absolutely need to check your pH. These symptoms might actually be from nutrient lockout due to low pH rather than true deficiencies - especially since you're using slow-release fertilizer. If you don't check first, you risk sending your EC through the roof while trying to correct the deficiencies, which could burn your plant when you're trying to save it. My advice? First test and adjust your pH (aim for 6.0-6.5 in soil). Only after pH is stable should you address the N/P deficiencies if they persist. Then stick to one consistent feeding method - either continue with slow-release or go back to liquids. Honestly, considering your past success, returning to your previous liquid regimen might be your best move.

agree with the guys it's NPK deficiency

Phosphorous deficiency. Nothing to do with root zone oxygen levels, "fermentation" or lactic acid.

It looks like your plant could use a bit more nutrients. Overall, it appears quite light in color, which might indicate a deficiency. The spots suggest that you should increase the phosphorus (P) and potassium (K) levels. I’d also recommend slightly boosting the calcium and magnesium as well. Since your pH level is consistently at 5.8, I’d rule out any pH-related issues. Plus, your other plants are doing fine, which points to this being an isolated nutrient imbalance. I also checked your grow diary—everything else seems to be in order. A slight adjustment in your nutrient mix should help fix the problem. Happy growing my growmie

your plant wants phosphorus for flower production

Hey 👋 Es mangelt an Kalium. Zusätzlich ist dein PH-Wert ziemlich niedrig. Ich würde versuchen ihn auf 6,2-6,5 zu kriegen während der Blüte. Bleibt er dauerhaft so niedrig, kann dies zu einer Nährstoffsperre führen. Hoffe es hilft 👊🍀

Oxygen in rootzones is non existent, exudates during flower increase rhizosphere activity dramatically, microorganisms scavenge oxygen in direct competition with the plant. Once oxygen is low or depleted the plant will switch from aerobic fermentation to anaerobic(no oxygen) without oxygen as a end receptor, reactions create lactic acid along with increased co2, this skews ph and reduces atp production leading to alot of symptoms I see presenting. Your environmental metrics are not making it easy for the plant to move water efficiently. Lime greening all over with no obvious start point is normally Indicative of skewed ph. But then again your in coco, that just makes everything different so it's hard to say. Good luck either way.