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Comparison of Plant Available Silicon in fertilizer sources.



Comparison of Plant Available Silicon in fertilizer sources.

Comparison of Plant Available Silicon in fertilizer sources.
 
Manufacturer

Fertilizer name

(common name)

Total Silicon %

Soluble Silicon (Si) %

Plant Available Silicon

JAOAC, Vol. #96, #2, 2013

PQ Corp.

AgSil 16H

(potassium silicate powder)

24.6% 8.54%
PQ Corp.

AgSil 25 - Sil-MATRIX

(potassium silicate liquid)

9.7% 7.6%
SioTex Corp.

Grow-Sil

(99.9% SiO2 pure biogenic silica)

46.7% 6.28%
Vanderbilt Minerals

VANSIL W10

(natural Wollastonite)

24.2% 3.6%
PQ Corp

AgSil 16H stock solution

(560 grams AgSil 16H in one gallon RO water)

~3.34% 3.25%
Harsco Metals llc

AgrowSil

(calcium/magnesium silicate blend, stainless steel slag by-product)

12% 2.2%
Harsco Metals llc

Crossover

(calcium/magnesium silicate blend, stainless steel by-product)

11.3% 1.9%
Plant Science Concepts

OSA 28

(PEG 400 stabilized silicic acid)

2.09% 1.06%
Mills Nutrients

Vitalize

(stabilized silicic acid)

NA 0.94%
Fertimaster

Power Si

(PEG 400 stabilized silicic acid)

1.71% 0.88%
Aptus

Fasilitor

(PEG 400 stabilized silicic acid)

1.61% 0.85%
Loveland Products

SST 28%

(stabilized silica technology)

13% 0.44%
PermaGuard

Fossil Shell Flour

(freshwater diatomaceous earth powder)

~42% 0.23%

 

Total silicon taken directly from the individual fertilizer's label, or calculated from the labeled SiO2 value. Plant available silicon determined by the American Association of Plant Food Control Officials (AAPFCO) approved method.

Silicon Labeling – The format below should be used for guaranteeing Soluble Silicon (Si) in a dry or liquid fertilizer. The method for Soluble Silicon (Si) is in the Journal of AOAC International, Volume 96, Number 2, 2013, pp 251-259. At this time the method is valid for dry fertilizer and will give a slightly lower number for liquids, but liquids should be analyzed by this method until a method is validated for liquids.   link to source

This method is detailed by Sebastian et al. in the Journal of AOAC International Vol. 96, No. 2, 2013.

A 5-Day Method for Determination of Soluble Silicon Concentrations in Nonliquid Fertilizer Materials Using a Sodium Carbonate-Ammonium Nitrate Extractant Followed by Visible Spectroscopy with Heteropoly Blue Analysis: Single-Laboratory Validation link to source

The values for the Soluble Silicon in the Harsco Metals, and Vanderbilt Minerals products as well as the PQ Corp AgSil 25 are taken directly from the article in the Journal of AOAC International Vol. 96, No. 2, 2013. All other products Soluble Silicon values have been determined by Thornton Labs at the request of a third party. I will display those analysis results below.

 

AgSil 16H

AgSil 16H soluble silicon, plant available silicon
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                                 .

 

AgSil 16H stock solution (560 grams AgSil 16H in one gallon RO water)

SioTex corp. Grow-Sil

Grow-sil soluble silicon analysis

 

Plant Science Concepts, OSA 28

 OSA 28 soluble silicon, plant available silicon

 

Mills Nutrients, Vitalize

Mills Vitalize soluble silicon, plant available silicon

 

Fertimaster, Power Si

Power Si soluble silicon, plant available silicon
 

Aptus, Fasilitor (testing paid for by Plant Science Concepts)

Aptus Fasilitor soluble silicon, plant available silicon

 

Aptus, Fasilitor (testing paid for by third party product customer)

Aptus Fasilitor (2) soluble silicon, plant available silicon
 

Loveland Products, SST 28

Loveland SSY 28% stabilized silica technology soluble silicon, plant available silicon

 

PermaGuard, Fossil Shell Flour, freshwater diatomaceous earth

PermaGuard Fossil Shell Flour freshwater diatomaceous earth  soluble silicon, plant available silicon