DaGreenBlazer this is my third time using fabric pots in a similar grow situation, 3 fabric the rest plastic. each time, the fabric go limy green, and then it just becomes a nutrient nightmare through flower. yes, i did not think that fabric would allow more nitrogen, I just thought the fabric would allow for more robust grow-air, roots etc. as you mentioned. also, i am not using more nutrient on the fabric than the plastic.
the only thing that I can see different in the amount of soil? the fabric are supposed to be 12 litre which is the plastic size,. but by sight i can see there is not an equal amount . so is this a possibility? but my nutrient feed ratio to water is a the same. example 5ml of feed to 5 liter.
the strains are all the same.
the fabric pots are rinsed thoroughly with water. no chemicals.
is it possible the fabric pot has something in the fabric that is not helping? and after three grows-tossed out.
possible a result of overwatering at the start? overfeeding during the first two weeks of veg growth?
thank you
Ahhh! My apologies firstly for thinking you were overfeeding due to mis-interrupting the packaging label! Am glad to hear to hear is all the same, so sorry for proposing otherwise!
In which case then, and without sounding like I'm flipping it on it's head too much, it could actually be the total opposite issue where it means you've actually been successful at using fabrics and those plants are just hungry & need more N - if your plastics are doing healthy & fine on the same feed amount/schedule then you're obviously growing good, and doing things correctly is when the packaging blurb does become true - rootzones do become bigger & consequently more feeding will be needed.
The main questions to determine it tho are, before the yellowing & in general, were your fabric plants showing stronger, faster, better growth than any of the plastic plants?? Or at the very least, were they keeping pace & looking equally as good?? Also, you mention overfeeding 1st 2 weeks veg, though again, did your plastic plants handle this fine, without showing any pH type issues??
If yes to both, then this more likely indicates that the fabric rootzone did quickly fill up most of soil area and by now has depleted it all (as opposed to your plastics which atm most likely have majority of their roots coiled round the bottom of pot & can still rely on untouched nutes above being washed down to them). I've never used fabrics per se, only the actual air-pots, though it is amazing how much more of the soil area roots fill up compared to plastics, and i found they do munch through the soil far quicker as a result.
So if yes, try giving the fabrics a slight increase in feed, and if that does show a good response then also consider buying/making a simple top dressing that can give a mini top-up of trace minerals as be good as well to help supplement your Grow formula. It could even just be a simple Cal-Mag top-up solves it too, so you could just try that 1st before putting more Grow N back in - some pics would help if possible too as i can only give you possibilities atm I'm afraid. (If you want to be cautious & help narrow it down abit more, you could just try where 1 fabric plant only gets feed increase & soil dressing only, whilst another 1 gets Cal-Mag amendment only, and see what responds best to then treat others with.)
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Otherwise, if the answer is no, and the fabrics have always been lagging behind, slow, weak growers even before yellowing, then the answer probably lies elsewhere and more N likely wouldn't help - potentially it's an inherent pH problem or potentially the roots aren't developing as well as they should & the fabrics haven't been successful - if all depends on the answer to above really. And again, if fabrics have always been weak, slow growers then i would say definitely post some pics if possible, as there's probably more to be diagnosed to them than the N issue. Otherwise i can only recommend ditching fabrics and stick to plastics if you're happy with the results.
And to answer, there's always the small possibility it's something on the fabric causing it, tho if you purchased from proper vendor they should be fine really, and any contamination type issue would usually be way more obvious than just looking hungry - like CKBrew recommends, try new, different fabrics if unsure too.