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Old 02-18-2018, 11:15 PM #3951
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The holding power of organic matter is unaccounted for. Field soil does not have 40-50% organic matter
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Old 02-18-2018, 11:29 PM #3952
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The holding power of organic matter is unaccounted for. Field soil does not have 40-50% organic matter
bog it up
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Old 02-18-2018, 11:51 PM #3953
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Lol...and don’t think about the weight thing
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Old 02-19-2018, 03:12 AM #3954
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The holding power of organic matter is unaccounted for. Field soil does not have 40-50% organic matter
Yea but you can still measure cec of organic matter using standard lab methods. So if you make a mix and get it tested, cec of OM is measured.
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Old 02-19-2018, 04:50 AM #3955
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Got to agree with that in theory. What do you reckon the avg cec of organic material is? Humic and fulvic are way up there.
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Old 02-19-2018, 11:48 AM #3956
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Lol...and don’t think about the weight thing
How would you recommend choosing my inputs then?

let's take another one: I badly need phosphorus for example.
How would you'd say I choose how many triple super phosphate I should add?
I'm open to sending other samples in, but I don't want to use only trail and error. There are plenty of people who did trail and error before me, so no need to re-invent the wheel I would think.

With my calculations I would end up with 12g for 5gal of potting soil.

This is the reasoning:
- I want to add 1160 ppm of P to get closer to K.
- 19.3% of the weight of TSP is P so I need 1160/0.19 = 6000ppm of TSP.
- 5 gal potting soil, oven dried + sieved equals 2000g.
- 2000 * 0.006 = 12g of TSP for 5gal of potting soil.


I'll use more gypsum indeed. I need to push out the K, Mg and Na first. I will try to do this with acidified low ppm rain water + gypsum + a little P.

Thanks for sharing your take
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Old 02-19-2018, 03:10 PM #3957
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Got to agree with that in theory. What do you reckon the avg cec of organic material is? Humic and fulvic are way up there.
Around 1000 meq per gram. Clay gets around 10 to 50. Sand is about 5.

I've worked in a soils lab and done CEC lab work. OM is counted.
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Old 02-19-2018, 07:14 PM #3958
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So what am I missing? If 40% of your mix is organic material how can your cec for the total not be around 400 plus whatever other contribution?

This is something I have not understood since I started this.
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Old 02-19-2018, 08:03 PM #3959
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Didn't we talk about peat having a crazy high CEC but the test wasn't showing it?
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Old 02-19-2018, 08:16 PM #3960
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I brought it up on page 7^ way back!
Bulk Density. meq/100g vs meq container volume.
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