Correcting Coir After Planting

Hey everyone, looked for the answer but not easy to find. I'm learning to use coir and making my own mixes. I started a batch of seed in a mix that had 1/4cup Dolomite lime and 1/4cup gypsum(per cu. ft.) mixed into coir. I'm getting calcium def spots and stunted growth. I made a new mix with 2x the above amount and we'll see if it's enough to buffer correctly. The problem children are in 1 gal pots. I will be feeding them with organic guano, diatomaceous earth, and gypsum. I assume one can not use lime in water to remedy this. I see such a variance on prescribed amounts of lime per cu. ft, but not sure how much is too much for a seed mix like mine and a heavy feed mix for adults. Hope someone can shed some wisdom to help me on my coir path. Thanks!

I’m a little confused. So is it straight coir then? Or a mixed soil with coir as part of the base?

Elijah Cloud said:

I'm getting calcium def spots and stunted growth.

Click to expand...

Got photos of your plants? That would be helpful. Coir doesn't need the buffering that peat moss does, so the first thing to pop up in my mind is that I'm questioning whether it's really a calcium deficiency. I'm not saying it isn't a Ca deficiency, but it's often mistaken for various pest issues by some folks. If it's affecting newish growth that's exposed to the light and further down the leaves still shaded are just great, you're probably right with your diagnosis. A Ca deficiency will only first affect parts of the plant that are actively contributing to growth or growing.