The only thing missing is a little ball floating so you can see it from a ways awayI know it‘s not pretty but it shows perfectly what‘s happening down in the rez:
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cheers
os
The only thing missing is a little ball floating so you can see it from a ways awayI know it‘s not pretty but it shows perfectly what‘s happening down in the rez:
View attachment 1315736
I think your real close on your thinking.Update: so there has been some progression of the deficiency since my last post. Overall the plant looks good and is drinking the whole res daily. I feel like it's still doing quite a bit better than my previous grows. In my previous grows when this deficiency started to show it would progress pretty quickly..like close to overnight it would spread through the upper growth.
Regardless, I am a little frustrated to see it return and I would really like to understand why it's happening. I would welcome any one following this thread to chime in with any advice or thoughts.
I will include pics below to try and show what is happening. I believe this is a calcium deficiency. As evidenced by the symptoms and the fact that it always shows in the upper growth of the plant and calcium is an immobile nutrient.
Here is a shot of the whole plant
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Below are examples of the symptoms that have worsened over the last days
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From my research I think I have sort of narrowed the possible causes down somewhat. It seems that the most common cause of cal deficiency is low ph acidic soil.I dont PH my water, as it comes out of my well/tap at roughly 6.8. My soil is peat based so acidity is possible, but my previous use of dolomite and current use of oyster shell flour should address this.I should be testing my soil ph to really know but I am reluctant to shell out the $ for an accurate soil meter.and I dont believe that run off/ slurry tests are accurate enough to draw a conclusion from.
The 2nd possible cause could be an excess of another nutrient locking cal out. I could see it being a possible excess of mag from my use of dolomite. Any other nutrient exvess does seem unlikely to me as I always try to use my amendments at a reduced rate from recommended. A less is more approach. And I feel like I would see more signs of excess before this shows up, which I dont really see. The plants just do super well up to this same point around day 40-50 and then these symptoms show up fairly suddenly.also this is a big fast growing plant that seems like it should be a pretty heavy feeder.
That brings me to my third theory.. possibly this explosive growth is just so vigorous that I actually am not supplying enough nutrients? My homemade SIPs are only about 7 gallons of soil so its also possible that I just am not supplying the plant with enough cal to meet its needs?? I wouldn't suspect that as,I have a lot of sources of cal in my soil. My previous use of dolomite, current use of oyster shell, gypsum and worm castings. Also the gaia green amendments I use have several sources of cal as well.again tho I dont see any signs of the plants being hungry before this shows up?
Please chime in and let me know any thoughts you might have. It's a real head scratcher for me and I just want to understand why it's happening! I am confident that the plant will still give me a great harvest and as I said earlier it is an improvement over my previous grows.also would you try and address it? In the past I have tried several things to correct it mainly adding more calcium sources through top dress or even using a liquid cal/mag supplement with no improvement and maybe only a little slowing of the progression.
Also, interestingly there is no sign of it in the smaller plants
Thanks everybody for any input you might have
I think your real close on your thinking.
#1 low pH soil. That’s usually due to being peat based and not having enough lime.
#2 that’s a possibility if dolomite is your only major calcium source
#3 not enough in the soil is what I suspect. In addition to using lime to buffer the soil pH of peat, the plants do consume lots of calcium. First, my buffering part, I use half dolomite and half oyster shell flour. Calcitic lime would be the equivalent of osf. That puts my buffering part in the proper ratio. More importantly, I use many other amendments quite rich in calcium. Those are fishbone meal, fish meal, crab shell meal, and gypsum. With calcium, the trick is to have many sources that become available at different rates spread out over time. Worm castings/ vermicompost also contains lots of calcium carbonate.
The thing that adds to the confusion, relative to what you read is water quality. Yours is good. Most stuff you read about is based on RO water or acceptable levels of carbonates that tend toward the high side. Luckily you and I have similar really good water, so I not only get it, but have been dealing with it forever.
Bonemeal is the easiest amendment to find everywhere. Mix a couple tablespoons in with a quart or two of castings and top dress it and water it in. The calcium available in the castings is available fast, with the calcium in the bonemeal becoming available a little slower.
Next round, I would be happy to help ya build a soil that will work with your water and sip containers.
cheers
os
I just don’t think you are getting screwed by extra mag. I really only see that happen with synthetics and salts, unless the water source has extremely high mag and low calcium. That combo is pretty rare. I also use Langebenite aka sulpomag, and I have just never had an issue. For years I just used dolomite, it’s only been 3 or so years since I switched to 50/50 dolomite/ oyster shell flower.@Organic Sinse thank you..your input is appreciated! And I would love to have your help with building a new soil. Although I am somewhat hesitant to start over with my soil as I have been building on this one for awhile now. But at the same time it was my first time building and reusing a LOS and I have learned a lot and part of me likes the idea of starting fresh with a refined approach.
I think my instincts are #3 as well...going with the theory that I simply may not be supplying enough calcium would explain why the smaller plants are not showing the deficiency as they simply don't have the demand for it like the big explosive plants do. It also explains why my previous plants grown in fabric pots with the same soil and same amendments did not show a deficiency. They were not nearly as big as my SIP plants and therefore likely had less of a demand for cal.
I guess I would still be a little surprised tho as all those sources of cal you mentioned are represented in my soil, both amended in the base mix and added through my top dresses. But maybe I just wasn't quite keeping up to the plants needs. Also it's possible that it is a little of #2 and a little of #3. Some excess mag from the dolomite locking out cal...and not enough available in the soil for the needs of the plants?
At any rate I have taken your advice and top dressed some bone meal and EWC today top watered it in well and we will see if that brings an improvement.
You gonna do the Horizon soil method? Thought about trying it in the sip. Ya know- the 15 gal grassroots was the only plant that didn't come down with yellow fever. Been thinking about a 2x4 bed for my bedroom.As the good ol homey MrOldBoy always said,
“Worms are nature’s best gardeners!!!” I toss em in my pots always and next run instead of earthbox I’m gonna be using homemade knf inputs and I ordered some grassroots 10gal living soil pots and will be tossing handful of worms into each! They def help on many levels so always have a place in my garden!![]()