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Shit Kamel,
I can't believe I have missed this thread. Do me a favor buddy, next time you start a journal and I have not replied to it after a while, PM me the link. The only reason I found it is because I saw it in the sick plants topic. I don't get over to the grow journals that often because I have been hanging out in the sick plants and general indoor growers area.
Anyway, this damn problem you are having is exactly like the one Stitch and I helped you with on your last batch of girls; the calcium problem. I have a few concerns here that I have noticed so far.
First is your soil. I did a search on it and if I am looking at the right stuff, it says it has quick release ferts and slow release that feeds up to 9 MONTHS. I am baffled by this because I would expect that your seedlings would have gotten burned right away and they did not. I just wonder if you are seeing some kind of effect from the slow release ferts now finally starting to be released. However it does not look like over fert or N deficiency to me because both of those usually (N can sometimes start in the middle) start at the bottom of the plant and move to the tops.
Second, what the hell is up with that crossed out calcium on the back of the fert box? Doesn’t it seem coincidental to you that you had a calcium deficiency (we think) on your last batch and now we find out the calcium has been scratched out? Did you use this soil and fertilizer on the last grow by any chance?
Third, I agree with what Spanishfly said that it could be magnesium deficient however looking at the back of your fertilizer box it says there is 0.5% magnesium AND 0.5% water soluble magnesium. That's 1% of magnesium, which is a very high percentage for a micronutrient although weed does need large amounts of magnesium but not over done. That makes me wonder with all that magnesium how it could then become magnesium deficient. However, a little Epsom salt probably won’t hurt.
Fourth, boy I have really been studying up here for you buddy. I found something in our friend Stitch's guide that I found very interesting. In her guide she says to avoid fertilizers that are high in ammonium nitrate because it can cause Nitrogen toxicity (too much) which in turn CAN LOCK OUT CALCIUM!!! Look at the back of your Tiger Bloom can. One of the biggest elements is the Ammonium Nitrate. It says it at the top by the nitrogen and again at the bottom where it says “derived from”.
Fifth, go easy on both the phosphorus and potassium because guess what, excessive levels of both of those can lock out calcium causing a calcium deficiency. Speaking of phosphorus, you said something interesting the other day in the thread. You said the stems were purple. Purple stems indicate a phosphorus deficiency but again, you are giving it lots of phosphorus so…
Finally, to sum up, here are my recommendations:
1. For your next grow, ditch this soil and get something different
2. Based on the ammonium nitrate and crossed out calcium etc, I would STOP feeding with the Tiger Bloom and don't use it on your next grow.
3. Try foliar spraying with some Epsom salt. If it does not get better within 24-48 hours stop the Epsom spraying.
4. Get rid of the Tiger Bloom (I already said this)
5. Go easy on the rest of the ferts you use. Too much N (ammonium nitrate) P&K can lock out calcium which I think might be happening here.
P.S. How much longer on these bad girls do you think before harvest? If it is two weeks or so, you might want to stop fertilizing all together and start flushing.
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