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Organic Silica For Your Plants
In most hydroponics applications, silicon is added to the nutrient solution as
potassium silicate. Potassium silicate is water soluble, but it reacts strongly with
concentrated nutrient solutions, forming an insoluble, glue-like substance. So when
using silicon additives, make sure that they are added in dilute form, not directly to
the concentrated fertilizer! 50-100 ppm is a good target for most applications.
Potassium silicate is also very alkaline in nature, raising the pH of the nutrient
solution. Raising the pH can be beneficial if the pH is below 5.5, but most water used
for irrigation is already too high for optimum plant growth. So when using source
water that is high in bicarbonates, adding additional silicon could worsen the pH
problems, making it necessary to add too much pH lowering products such as
phosphoric acid. In extreme cases, high levels of phosphoric acid could lead to
phosphorus toxicity.

Wednesday, 09 April 2014
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