Vanderbilt Minerals, VANSIL W10 wollastonite.
Natural calcium silicate, mined mineral. OMRI approved fertilizer and limestone alternative.
Not a Steel slag by-product.
Click here for a comparison of fertilizer sources for soluble silicon (plant available silicon) content.
Wollastonite was the most effective amendment at increasing Silicon uptake and for suppressing powdery mildew disease in a greenhouse experiment conducted with Cucurbita pepo L. “Howden” pumpkin to compare the effectiveness of various soil amendments for providing Si nutrition, improving soil fertility, and suppressing powdery mildew (Podosphaera xanthii).