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Plant Available Silicon, Soluble Silicon In Fertilizer Sources, Aafpco Approved Method

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View attachment AgSil 16h soluble silicon analysis.pdfView attachment OSA28-PlantAvailableSiliconAnalysis.pdf
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Very interesting. Thanks for posting. I'm trying to decide whether to use silicon or not in my grow. If I DO use it this is very helpful info.
 
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You know you have gone too far with your soil recipe when you are adding fossil shells. :)
Im not sure about the benefits of adding silicon base products. It's why I haven't yet. I'm still looking at all the info etc. My last grow was fantastic for yields and they did really well considering all the abuse they got and that was without silicon added. I'm trying to understand how silicon would help my plants and is it worth it. I'm still sat on the fence.
 
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Does anyone have a source for Agsil 25 the liquid version of Agsil 16h?

Agsil25 has slightly less plant available silica compared to Agsil16 powder (7.6 ppm versus 8.5 ppm), but way less total silica 2.5x less at (24.6 ppm in Agsil16 versus 9.7 ppm in Agsil25) so thats way less non plant available available silica thats doing nothing for your plant and raising the PH of your reservoir. Agsil25 seems like the superior product but where can you buy it?
 
Does anyone have a source for Agsil 25 the liquid version of Agsil 16h?

Agsil25 has slightly less plant available silica compared to Agsil16 powder (7.6 ppm versus 8.5 ppm), but way less total silica 2.5x less at (24.6 ppm in Agsil16 versus 9.7 ppm in Agsil25) so thats way less non plant available available silica thats doing nothing for your plant and raising the PH of your reservoir. Agsil25 seems like the superior product but where can you buy it?
Custom Hydro Nutrients has a PQ corp product under the name of Sil-Matrix
https://customhydronutrients.com/silmatrix-soluble-potassium-silicate-25-gallon-p-792.html?cPath=36_74
 
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This 5-Day Na2CO3-NH4NO3 Soluble Si Extraction Method is applicable to the detection of soluble Si in nonliquid fertilizer products, blended products, and beneficial substances at Si concentrations of 0.2–8.4%, with an LOD of 0.06% Si, and an LOQ of 0.20%.
so you can see that agsil 16h actually maxes out the test results.

it is likely much closer to the total silicon concentration.
 
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Here is a soluble silicon analysis on a concentrated stock solution of AgSil 16H. The stock solution was prepared by diluting 560 grams of AgSil 16h in RO water and bringing the final volume to one gallon. This calculates to a concentration of 3.6587% Si weight/volume (~3.37% Si weight/weight). As you see the results for the analysis says 3.25% soluble silicon using the same AAPFCO testing method.
View attachment 652350
Plant Available Silicon of Fertilizer Sources v3.jpg
 

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