Lockout or deficiency

It sounds like you're on top of monitoring your plant's nutrient levels. In this case, the discrepancy between your input (1.6 EC) and the runoff (2.2-2.4 EC) could indeed suggest a potential lockout. Here's what might be happening: Nutrient Lockout: The higher EC in the runoff could indicate that the plants are not taking up nutrients effectively. This could be due to a pH imbalance or issues with nutrient availability in the soil. pH Levels: Check the pH of your soil. Nutrient uptake is influenced by pH, and if it's too high or too low, it can impact the plant's ability to absorb certain nutrients. Nutrient Ratio: Ensure that the nutrient solution you're using has a balanced ratio of nitrogen, as well as other essential nutrients. Sometimes an imbalance can lead to nutrient lockout. Flush the System: If you suspect a nutrient lockout, a flush with pH-balanced water can help reset the system. This involves watering with plain water until the runoff has a lower EC. Monitor Soil Moisture: Ensure that the soil is not consistently too wet or too dry, as both extremes can affect nutrient uptake. It's a bit of detective work, but checking pH levels and adjusting your nutrient solution accordingly could be a good first step. If the issue persists, a more thorough flush might be necessary. Keep an eye on your plants, and they should start responding positively with the right adjustments!

Stop misting your plants, they don't need it. Misting your leaves only serves to open up pathways to allow pathogens to infiltrate your plant tissue, so just stop it. Plants that young aren't usually deficient in anything unless you have simply not been giving them food. Judging from your feed regiment they are getting plenty, perhaps too much. All those fancy bells and whistles the nutrient companies market are unnecessary. Grow-Bloom-Micro-Calmag-Fulvic acid. Thats all you need.

Stress from growing at 24/0, combined with feeding too many things. 18/6 is optimal, all plants NEED sleep for a correctly functioning metabolism! Highly unlikely that there any deficiencies, most likely a start of toxicity, especially if you are not getting a good run off each time you irrigate.

"runoff" is waste -- toss down the drain or outside, but not on a potted plant. don't let it sit in its piss, either.

runoff is always wonky. what matters is that it is consistent. if you measure early in runoff you'll get a different measurement than late in runoff.. it's really more for people with OCD to worry about. if you use a soilless substrate correctly and buy the proper nutes (ph-buffered, 100% plant ready and soluble nutes), this problem is nearly impossible to have (buildup). So, let's review watering/ferigation habits with coco. 1.3-1.5EC is probably the range you will operate in. it may be a bit higher or lower due to environmnental vairiables or possibly some esoteric genetics due to poor selection process of breeder. you fertigate every single time with a religious 10% runoff or more. If you do this, you do not have to measure what is coming out the bottom. it can't build up. IT can be too high of a concentrationmixed, but when you see issues you know you need to adjust formula and not worry about lockout. 120-130 N 60 P 180ish K 100+ Ca 50-80 Mg 100 S that's a light mix in a good ratio. That's roughly 1.3 EC if using the upper ranges of the suggestions. if you started here, you'd have very minor adjustments to make. This assume proper pH, which should be solid if the fertilizer you bought is a bonafide "hydro/soilless" use fertilizer. products that aren't ph-buffered for this context are trash-dick products. you shouldn't have to adjust pH. Still important to spot check occasionally.

In your diary you have just transplanted them to a bigger pot. Perhaps you needed to get a lot more runoff when you fed after the transplant. Looking at your nutes your probably putting in enough nutrition, your ph at 5.9 is OK, I prefer 5.8 in coco during veg. Your coco looks dry on the pictures which also says to me you needed to run more nutes through. Make another batch of nutes and aim for a good 20%-40% runoff. Eg you put 1L through you want minimum 200ml runoff.

Your runoff EC is too high for the veg stage which means it's a nitrogen lockout.