As long as you account for the potassium added from the potassium silicate it shouldn’t be a problem. I like to use hydro buddy when calculating my fertilization.Potassium/calcium is a see-saw that has to be in balance.
The cation exchange with coco has residual K and potassium silicate can lock out calcium. Further, the same high potassium can lock out calcium with Jack's 5-12-26/cal nit. You are best to use an alternate silica source in either scenario.
Alternate sources would be rice hulls (charred for quicker availability), stabilized silicic acid or using potassium silicate as a foliar versus drench.
Yes potassium and calcium is a balancing act but it’s not quite as extreme as you’d think. I’ve ran upwards of 325 ppm of potassium in peak flower while lowering my calcium nitrate input with no detriment to yield or quality. As from my understanding, That run my Glue broke 1.1gpw and upwards of 30% Thc. My best run yet.
the profile I like to run in coco nonetheless is 120-60-280-120-60, n p k ca mg. Keep in mind this is with the additional potassium from the silicate and media calculated in, not additional to the 280-325ppm. As long as you have runoff you should be fine.
Thats why if you look at bloom boosters they all increase your potassium like crazy throughout and near the end of flower. Cannabis loves it.
I’ve found and as well as others here on the farm that with a higher potassium ratioit results in tighter more potent flowers and less leaf material. I actually learned this from dankworth and Jalisco kid from here on the farm.
Hence why I wasn’t a fan of the canna coco profile. Don’t get me wrong I’ve seen some healthy plants from it.
All I’m saying is once you’ve got your stuff dialed in. Try experimenting with higher potassium later in flower. Its game changing. Seriously.