Great outdoors
Active member
Yeah Great Outdoors,
it seems calcium and silica should be right up there with the ol’ NPK. I remember Tom Hill saying he’d take calcium over magnesium any day, in his soils; he did foliar spray with cal/mag once a month and brix mix every fortnight.
In actual fact I’ve just heavily top dressed gypsum, meseca flour, wood ash out of the fire and blood and bone meal for four different sources of calcium.
40.
I learned a great calcium lesson years ago with my tomatoes. I would always struggle with blossom end rot. Heaps of good healthy tomatoes but trouble keeping up with the calcium need. Then I discovered crushed oyster shells. 50lb bag from the feed store is 10-15 bucks. It was late in the season so I just made a couple inch top mulch of crushed oyster shells. Blossom end rot disappeared. In subsequent years I started mixing it into my soil for both tomatoes and cannabis. I mix so much of it in my soil that I use it as a form of aeration. The beauty of it is it's basically inert until the plant or soil organisms release organic acids to release the calcium. Basically calcium on demand for the plant. Huge improvement in all my plants.
Pproblem now with Covid is my local feed store can't source the shells. I have been using wood ash this year as my main calcium source though my no till mounds surely have some left in there.