I think that the real problem is the micro deficiency. I am currently going through the same problem and apparently Zn and Mn def is DEVASTATING!!! It could be caused by high P or sandy soil, or just a lack of input to begin with... The article that I read actually used the word devastating when referring to micro def. Question is, how do you fix it... The test is like an X-Ray and you ID'ed the problem, but how do you fix broken bones. Rock dust is too slow to break down and large amounts of kelp with cause Na build up. The compost that I was making had extreme excess of phosphorus and locked out Fe and Micros. It's a catch 22 with compost...
There are some pretty inexpensive liquid iron and zinc combo fertilizers that are intended for grape growers...but work really well at boosting the levels of the micros in your soil for cannabis too. A few small applications throughout the grow are all that's really needed. if you've got a good soil it will hang on for a while.
I run into this with magnesium, but it's because my recipe is imperfect...
langbeinite or sulfate of potash magnesia is a great way to make sure your magnesium and potash levels are solid. and you really only need a pinch and a half per cubic foot. Recycled soil, 1 cup of fish meal, 1/2 cup of gypsum, and 1/8 cup of langbeinite per plant is what I've done for my recent grow and i've got no deficiencies to speak of.
It's not a deficiency per se, occasionally my mg gets high because I use dolomitic lime, so the ratio isn't exactly so.
Yeah dolomite lime has a reputation for doing that. Once you've used the dolomite for your initial soil, you really don't need to use it again as long as you have other calcium inputs. Most bone meals or crustacean meals will give you all the calcium you need on your future uses.
Thanks for bringing up this old thread. I'm experimenting with no till living soil now and this sounds like just what I need to really help me dial stuff in. Already have 1 kit in my Amazon cart. Great info.
Way too much sodium in your mix. Probably from the crab meal, or too much Langbeinite. Maybe ease off any ocean based amendments or minerals that are higher in sodium (like Langbeinite).
Looking at my notes I did add more crab meal than I thought, kelp as well. Looks like I have plenty of K so im thinking Langbeinite should not be added either. In looking to add some P I have Seabird Guano 0-11-0 but that has calcium and my calcium numbers seem quite high already so Im thinking I should look elsewhere. I was thinking I had a manganese deficiency and this test seems to confirm that. I am either too high or too low with things. It seems like what I need to add also contains things I do not need more of.
