I'm posting a few pics of my grow. I am growing Cherry Blossom from Blue Forest Farms out of CO. You can see from one pic that I used the post hole (no till) method for my grow. I am getting wierd results in that plants right next to each other are growing at radically different rates. Also am having some kind of bug invastion (not dramatic, but persistent) and am using soap water spray to try to knock that out. Finally, a few of my plants are turning a bit yellow. Not sure what they need -- water and nutrients are same shared all around. And finally, maybe about 20-25% are super nice, growing great with beautiful stem health/thickness and lots of branches. Kind of fun learning about all this.
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If you've added too much peat, you may still be too acidic in some areas of the root zone unless you are creating a thoroughly mixed slurry with your medium and raising the ph with lime until you hit the sweet spot of 6.5 - 7.0 consistently throughout the mix. I was reading the other day that ph levels above 7 are still adequate for the plant as it will adapt and still be able to uptake sufficient micronutrients. There's a chart that shows the availability of micro/macro nutrients based on ph of growing medium. I'd look at your ph and check the chart to see if you're not getting enough of one of them. Even if you are applying in a well rounded nutrient regime if your ph is a little too low or high it may inhibit the availability of said nutrients to the roots. Another thing that may help is making sure you've got well established mycorrhiza activity among your root systems. The potting mix we used to start our plants had mycorrhiza already mixed in and we have noticed it forming little networks all throughout the trays. Apparently these networks interact with your plants roots and actively supply them with what they need at a greater level and consistency than they can achieve by themselves.
Looks like soil or water PH may be an issue or possibly overwatering. Check out this link: https://www.growweedeasy.com/why-cannabis-leaves-yellow