Lab Test Results From My Soil

Haven’t had anything interesting to post in a while. I decided to spend $40 and get my soil tested by a laboratory. This soil is what is left from my last indoor grow, all I did was chop the stem at ground level. My last grow was probably the worst one I have ever done, very poor yield and quality.

I will need to take some time to digest these results and try to understand them. Anyone have any thoughts right off?

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Your numbers are crazy high. More like toxic. They’re telling you to add more N to help compost the excess of other minerals. I’d dump that into a compost pile and start again with new soil.

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I apologize, I should have gave more info about this soil instead of just posting the lab results. It was late and I was sorta tired out.

So, this is the living soil from my last grow. Here is the original mix:

During the entire grow it was water only with the exception of a top dress with some Langbeinite 0-0-22 one week into flower and then a few feeds of organic Potassium. The plants looked like they had a Potassium deficiency which never improved after the feeds.

This is the fourth time using this basic recipe, the first three grows did fine this last grow was less than stellar. I had a lot of things going on in my life at the time; work, taking care of my disabled wife, had a heart attack (damn!) so my plants got ignored more than they should have and might not have been because of the soil mix.

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Holy smokes those are some toxic levels Did you amend the FFOF with these nutrients then start the grow? That medium alone and straight from the bag is around 2500-3000 PPMs. Most organic growers don’t start top dressing nutrients for several weeks using these types of medium :love_you_gesture:

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Actually I did amend the FFOF at the start of the grow. I followed what some other folks did with this who achieved great results. But you know how that goes.

It was hot for sure, I saw signs of excess nitrogen during the grow. The thinking is it takes ‘some’ amount of time for all this to break down and become usable. How much time I can’t really say.

I would like to add a couple of things. The soil test is geared towards agricultural testing with ‘high’ being optimum levels on this chart. I don’t know how applicable the relative ratings are applied to this type of highly amended soil.

I did test the PPM of my sample before sending it in and got a reading of just shy of 4000 ppm.

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It is interesting to see the distribution of NPK and other nutrients in a PPM that is so high.

Cool test. Thanks for sharing.

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It was locked out.

This may put your test into perspective some more.

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Exactly. Too much calcium probably caused the potassium lockout? This soil test has been very informative so far.

Unfortunately they didn’t perform a cation exchange capacity (CEC) test so I can’t convert my PPM’s to base saturation levels. Unless there is some math I am not seeing right off.

I haven’t found a similar chart like you provided that shows relative PPM’s. Do you know of any?

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I had the Lab send me the relative ppm’s they use for their charts based on a typical flower garden. On this spreadsheet below I scaled my ppm’s down by a factor of 10 to see the how the ‘balance’ between the minerals are.

I don’t know for fact but expect most of us run much hotter than your average outside flower garden so I don’t think I am 10x too much. If anyone can shed some light on that it could be helpful to me.

I was going through some posts from VIVOSUN facebook a bit last week and someone posted about miracle grow and cannabis, which is a weed. They also had problems, low yields an various problems. After reading made sense. Miracle Gro gets rid of weeds. Right after reading I went with fox farms

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Hi All,

Just thought I would update you on what I did this extremely hot soil. I ended up mixing it with peatmoss at a rate of 1/3 parts soil to 2/3 parts peatmoss.

I just flipped to flower mode a few days ago and so far my three plants (different strains) look really nice.

I got a crap load of peatmoss left over and would like to try and use it to build some more soil for my next grow if possible… if not I gets dumped outside somewhere.

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Coming up on the end of the stretch, all three plants look fabulous… not a single brown/yellow spot anywhere. I had them in 1 gallon containers in this hot soil (before diluting with the peatmoss) and they were struggling with it.

Normally I finish them out each in a 3 gallon container. This time I planted the three of them in a single 20 gallon container. Maybe it is because my last couple of grows have been less than stellar… embarrassing to be honest. But I couldn’t be happier with how this grow is doing.

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