I dont have a way to test for Mg, and the water I use is filtered water. You stated "K is gonna start at the edges and work it's way inwards, not start in the middle of the veins." this is exactly as the pictorial shows and if you look at the other leaves effected it's what appears to be happening, starting from the edges moving towards the middle. It seems like we agree here.
I don't know for sure, but a small sample couldn't cost too much.
Except that the bright yellow to me still suggests magnesium. Addressing magnesium issues is easy. Epsom salts are cheap and at a teaspoon per gallon, go a long ways towards fixing this.
We do not agree. Look at the tips on this leaf, what do you see?
Filtered water like RO or ZeroWater? What's the medium in the pot?
I use epsom salts only during veg. I switch to cal-mag at about the second week after switching to 12/12. My soil mix is Ocean Forest which I pre-wet and allow to sit in a moistened state for a couple of weeks prior to use. This seems to activate the buffering in the mix. I use distilled water as my water source so its near zero ppm starting out. The reason I don't use cal-mag from the start of the grow is because when I have, I had magnesium issues later on during flowering. (Sound familiar so far?) Without any scientific testing to back this up, what I believe has been happening when I started with cal-mag from the beginning of the grow is calcium locking out other essentials, especially magnesium.
it's an Ion exchange filter tbh not sure if thats good or bad for plants, but my hole house is setup with it and they said when it was installed that it also supplies water to my irrigation or garden hose, cant remember. The soil is by foxfarm, I cant remember the exact name though, i know foxfarm has a few different ones. Got it from my local outdoor box store.
you specified, "from the start of the grow", is this from as a seedling or during veg?
For the first few weeks, I add nothing. It's straight H2O during waterings. Plants are 2-3 weeks old ... maybe a month when I introduce nutrients to them. Its at that time I start with epsom salts. The only time I will deviate is if I start to see calcium issues during veg (extremely rare).
ok, I did the same. If I recall I waited until veg/ or until there was something like 3-4 nodes before giving it cal-mag and a little nitrogen supplement which was around the time i started seeing full leaves start taking a yellow hue.
But I'm not using cal-mag at that point. I'm using epsom salts. I don't start cal-mag until about the second week of 12/12. Once flowering initiates, calcium needs go through the roof. I prefer to have the extra calcium available shortly before its called upon instead of upsetting the delicate nutrient ratio balance. You hear all about nutrients but not enough about ratios. Your nutrient ratios are just about as important as the nutrients themselves.
You had stated that you have used cal-mag at the start of the grow but don't anymore, I was trying to understand what you meant by "at the start of the grow", or did i miss-read this?
So I'm guessing it reads under 10 ppm or so?
The illustrations are as accurate as a half decent drawing can be.
Maybe i missed it but the ppm of what exactly?
yes, I did recently have a major grow light upgrade.
Ppm of your source water.
You mean the one about the Mg atom being the center of a chlorophyl molecule? The one where you pointed out that its the foundation of which everything is built upon?
