Greensand is a silicate and silicates are slow to break down and release
its nutrients. When I fertilize with 10-10-10, for example, I sometimes see
plants responding to it in as little as eight days. Any effect that
greensand would impart to plants may take months or years to be noticed.
Jim Fruth
Brambleberry Farm
Pequot Lakes, MN 56472
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[NAFEX] One more thing about Greensand,
Jim Fruth, 06/24/2009