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Your going to get a lot of suggestions about how to feed your plants. IMHO it is best to use a vendors entire line ONLY. They spend millions of dollars developing nutrients to work together to achieve the best possible results. It is all about liebig's law of the minimum. When you understand this you will understand why you should not mix-n-match your own. The only exception to this rule is when you have deficiencies (it won't happen often if using nutrients correctly). There are a couple of additives I do like and use: Azos and Mykos are microzae and beneficial fungus, Botanicare HydroGuard protects roots in DWC and Mammoth P in all my grows. Other than this I use a vendors entire line only on their schedule for what I am doing. Grow in coco with coco specific nutrients. As to the strength, the vendors charts are a beginning point and for many strains or phenos it is too strong but not all strains or vendors. So I have a system where I start seeds at 1/4 strength for the first week then 50% for the next and I continue to increase by 10% each week until tip burn is observed then back off 10%. This gets you to where the plant likes it not just blindly following the chart. Adding Cal-Mag to a coco coir grow does not upset the balance of nutrients when you follow a coco coir product feeding schedule. In this visual picture of nutrients out of balance SE is the limiting factor. All of the nutrients that rise above the water line are wasted even to the point of a lock-out.There was some logic behind it, however misguided. I first started reading about growing just two days before biting the bullet and ordering all my supplies (about five days before germinating). My baseline early on became the ultra-conservative growweedeasy guides. They recommend a lot of traditional stuff like 'only feed nutrients every other watering' for coco. I thought since I was feeding daily, perhaps I would back off the usual CalMag dose just a little to avoid an accumulation of calcium toward the end of the grow. It would appear it might not accumulate in the substrate to the extent I had anticipated.
I'm about 95% sure this is the problem now. I'm going to do a light late feeding tonight to bolster calcium levels.
Edit: I just re-fed, this time with a hefty dose of CaliMagic. Day 10 is when I decreased from 5 mL to 3 mL.
Yesterday evening, Day 11, was when something just seemed wrong about the color of the older leaves to me (~30 hours after the first reduced CalMag feeding).There's something to seeing it in person, I think, which allowed me to intuit something was up before it became readily apparent in photos. This has been a valuable lesson, and I hope one that won't stunt growth and hurt my final yields too much.
Liebig's Barrel.