Potassium Silicate, 32% K2O, 52.8% SiO2 dry powder, 4 pounds

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(1 customer review)


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AgSil 16H, 4 pounds in a re-closable plastic container.

Hydroponic grade Water Soluble Potassium Silicate fertilizer

AgSil® potassium silicate offers growers these performance benefits in many agricultural applications:

 Provides resistance to mineral stress.

 Decreases climate stress.

 Improves strength.

 Increases growth and yield.

AgSil® potassium silicate helps plants to resist toxicity from phosphorous, manganese, aluminum, and iron, and increases tolerance to salt 1. AgSil® potassium silicate also aids in resistance to drought by reducing water loss, and in some cases it may increase growth and yield 1-5.

Application of AgSil® potassium silicate improves leaf erectness, reduces susceptibility to lodging in grasses, and improves photosynthesis efficiency 1. For turf this can result in faster, healthier greens and athletic fields. Row crops, vine crops, ornamentals, and hydroponically grown plants can all benefit from potassium silicate supplementation.

This is a 1.6 weight ratio, hydrous potassium silicate powder with 32% K2O and 52.8% SiO2 and 14.8% H2O.


 AgSil report

AAFPCO soluble silicon analysis 8.54% soluble silicon9

 Potassium Silicate MSDS

 Soluble Silicon; Its Role in Crop and Disease Management of Greenhouse Crops.pdf

 0.7 grams in one gallon of water yeilds 98ppm SiO2 or 46ppm Si, and 49ppm K

 Never mix concentrated silica solutions with other concentrated fertilizers.

Application Rates

Growing System

Si ppm (SiO2)

NFT, DWC & other constantly recirculating hydroponics.

3-6 ppm (7-12)

Drip systems, Ebb and Flo & other automatic fertigation systems.

15-20 ppm Si (32-43ppm SiO2)

Weekly drenches in soilless or other low silicon soil/media systems.

45-50 ppm Si (~100ppm SiO2)

Concentrated stock solutions & dilution rates for 100 ppm SiO2 ( 46.75ppm Si) in final nutrient solution










Grams of AgSIl 16H per liter of concentrate

38g / L

24.25g / L

19g / L

148g / L

Grams of AgSil 16H per gallon of concentrate

144g / Gallon

92g / Gallon

72g / Gallon

560g / Gallon

mL of concentrate to achieve 100 ppm SiO2 in one Liter final solution

5mL / L

7.8mL / L

10mL / L

1.28mL / L

mL of concentrate to achieve 100 ppm SiO2 in one Gallon final solution

19mL / Gallon

30mL / Gallon

38mL / Gallon

5mL / Gallon

 For foliar IPM application, we reccomend mixing AgSil 16H with Dyna-Gro Pure Neem Oil.

Mix 1.5 grams AgSil 16H with 1 ounce Dyna-Gro Pure Neem Oil to saponify the oil. Then mix this saponified oil with one gallon final volume spray solution. Spray every other week covering all plant surfaces (top and bottom of leaves) until it runs off.




  Marschner, H., Mineral Nutrition of Higher Plants, Academic Press, 1995, pp. 417-426, 440-442.

  Datnoff, L.E., et al., “Influence of Silicon Fertilizer Grades on Blast and Brown Spot Development and on Rice Yields,” Plant Disease, October 1992, pp. 1011-1013.

  Miyake, Y. and E. Takahashi, “Effect of Silicon on the Growth of Cucumber Plant in Soil Culture,” Soil Sci. Plant Nutr., 29 (4), 1983, pp. 463-471.

  Miyake, Y. and E. Takahashi, “Effect of Silicon on the Growth and Fruit Production of Strawberry Plants in a Solution Culture,” Soil Sci. Plant Nutr., 32 (2), 1986, pp. 321-326.

 Miyake, Y. and E. Takahashi, “Silicon Deficiency of Tomato Plant,” Soil Sci. Plant Nutr., 24, 1978, pp. 175-189.

 Schmidt, R.E., et al., “Response of Photosynthesis and Superoxide Dismutase to Silica Applied to Creeping   Bentgrass Grown Under Two Fertility Levels,” J. Plant Nutrition, 22 (11), 1999, pp. 1763-1773.

 Posters presented at Silicon in Agriculture Conference, Sept. 26-30, 1999, Ft. Lauderdale, FL. “Effects of Silicon on the Seedling Growth of Creeping Bentgrass and Zoysiagrass,” by Z. Linjuan et al., China Agricultural University; “Influence of Silicon and Host Plant Resistance on Gray Leaf Spot Development in St. Augustinegrass,” by L.E. Datnoff and R.T. Nagata, University of Florida.

 Chen, J., et al., “Let’s Put the Si Back into Soil,” University of Florida, Mid-Florida Research and Education Center, Apopka, FL.

Sebastian et al. Journal of AOA C International Vol. 96, No. 2, 2013.pdf

AgSil 16H soluble silicon, plant available silicon analysis results


AgSil 16H soluble silicon, plant available silicon













































Additional information

Weight 4 lbs

1 review for Potassium Silicate, 32% K2O, 52.8% SiO2 dry powder, 4 pounds

  1. Rated 5 out of 5

    John A (verified owner)

    Great product to deliver soluble Si to plants!

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