Ammended Coco/perlite organic grow - how can i measure how good my recipe really is?

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I am doing a first grow and I went with a coco/perlite mix in fabric geopots. I amended the medium with a composted manure, EWC, an organic generic powder basically. I wanted to keep it simple.

My plants are not doing that great to be frank. I did deal with some issues that helped turn things around like up potting, making some organic teas with zymes in it. And my plants do look pretty healthy, but small and I suspect maybe they were stunted in veg from some stress.

They are flowering now, but they are growing so slow. I did LST and have good bud sites. And I have good PH around 6.2 all thru the grow. And my HPS lights are good. And I have good aeration. And I don't hand water now. I have a sub irrigation SIP watering DIY going now and my plants seem to be self watering nicely.

So after looking at so many aspects of my grow, I am left wondering if maybe my TLO recipe is lacking the right feed in it. Can I use a TDS meter and just capture some runoff and measure it and be able to trust the reading and maybe make a determination on if my recipe had enough feed in it?
 
Sounds like there was not enough Bio diversity and actual food. SOIL is food,especially when its blended correctly with other foods that the Life takes up making it much more potent. so a light and airy mix is never the way to go for quality and ease of use. AACTs are always a good idea. Bacterial and Fungal teas swapped are good too.
 
who can I see how much nute is in my medium just so I know? TDS runoff water? I don't have a TDS. Didn't think I'd need one with a TLO approach. But maybe I should get one just to measure where I'm at.

Should I do a TDS?
 
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