ButterflyEffect
Well-known member
wonder if its more of a surfactant type thing, than an uptaking
The way I understand it is that Si only uptakes via the roots. And at that, only a very small amount(10ppm or less).
Perhaps the PM benefit comes from the Potassium. I sometimes spray Potassium Bicarbonate for PM and Septoria.
There's also been talk of Si showing little to no benefit if your Ca & B levels are where they need to be. Case in point, ever since I started ramping my Ca up in late veg thru stretch, my stalks have been massive all the way to the top.