Every Grow- At the end they do this?

[Mushinronsha]

Hello Peeps. Ive been around on the forums and have become quite proficient at growing. ( I feel I am) Its a nice feeling once you get everything dialed in and dont stress about it. With that being said if I dont come forward with my issues (no matter how perfect I think my system is) I will never learn or grow as a grower. So my issue is below and I will list the details I can think of, but what puzzles me is this happens at towards the end of each of my grows. Every single one of them. There is always a few plants this happens too. So I would really like someone to narrow it down for me and maybe make some suggestions on how to fix and prevent if they can. It would go a long way for me to feel complete in my growing endeavors. So the details:

This is about 6-7 weeks into the grow that it starts.

Environment:
- Temp 70-75 F
-RH 60%
- Lots of Air movement
- Exhaust with passive intake (roughly 2 air exchanges per hour)
- LED quantum boards (600-800ppfd across grow foot print)
-light cycle 20/4

EDIT: PH 6.0-6.3

Nutrients Feeding:
- Flood and Drain oxygen-pot system with 60 gal reservoir
- Feed Freq = a full fill and drain cycle every 4 hours.
- Nutrients is Megacrop 2.0 @ 3 grams per gallon
- water is filtered tap water (not RO) just de-chlorination and sediment. Sits around 200ppm.


So it starts like this. Just some minor tip burn. I have typically ignored this as the formula for MC being an AIO I would expect so level of tip burn on occasion.

But than it starts to get worse and looks like this. The burn becomes more prominent and begin to get some yellowing and start of some spots.

And then as it progresses further. I stat getting really bad yellowing and spotting. As below.

I have always not worried to much about it but I feel like I am missing something. But I am no expert and the charts tell me it could be 7 different things. I think just looking at them I was thinking maybe a excess amount of Phosphorus causing calcium, magnesium, iron deficiencies? If that is it, why is no one else having this using MC 2.0? So I have been running in circles and figure Id post it here publicly and let the community I came from take a stab at it. ....

 

[420Forever]

ya, me go thru the same thing, lol but tryin to figger it out makez me head jus plain...hurt ...so hey, as long as the budz keep buildin & frostin, and it ain't a total meltdown, i've stopped trippin on it, lol it hazn't effected end quality in any way, so i jus figger what the hell & that one o' theze dayz, it'll sort out one way or another :smoking: actually, me current 110d kush girl, Gracie, has been doin that silleeness since around 35d or so, lol...but, she'z made it to the end & will be gettin the chop in jus a few dayz jus in the last couple dayz, i've tested some small piecez o' jus popcorn, annnd...nope, quality has def not been effected...one iota ppp

edit: fwiw, i'm in soil & have been uzin mc v2.1, a liquid bloom nute & calmag

 

[Mushinronsha]

ya, me go thru the same thing, lol but tryin to figger it out makez me head jus plain...hurt ...so hey, as long as the budz keep buildin & frostin, and it ain't a total meltdown, i've stopped trippin on it, lol it hazn't effected end quality in any way, so i jus figger what the hell & that one o' theze dayz, it'll sort out one way or another :smoking: actually, me current 110d kush girl, Gracie, has been doin that silleeness since around 35d or so, lol...but, she'z made it to the end & will be gettin the chop in jus a few dayz jus in the last couple dayz, i've tested some small piecez o' jus popcorn, annnd...nope, quality has def not been effected...one iota ppp

edit: fwiw, i'm in soil & have been uzin mc v2.1, a liquid bloom nute & calmag

Yes, indeed I havn't noticed any degrade in bag appeal as it mostly the fans leaves that get it and the quality has always been really nice, but I dont believe it is normal though so I feel like I am missing a step in my grow process or need to make an adjustment somehow. Also, the one thing I cant measure is if it effecting yield. I have never been disappointed with a yield, but what if I can get a little bit more? Anyways thank you for the response mate. I did want to ask and maybe I missed an update but this is the 2nd time I heard someone mention MC2.1 and not 2.0. Did they make a adjustment to the formula I missed?

 

[420Forever]

Yes, indeed I havn't noticed any degrade in bag appeal as it mostly the fans leaves that get it and the quality has always been really nice, but I dont believe it is normal though so I feel like I am missing a step in my grow process or need to make an adjustment somehow. Also, the one thing I cant measure is if it effecting yield. I have never been disappointed with a yield, but what if I can get a little bit more? Anyways thank you for the response mate. I did want to ask and maybe I missed an update but this is the 2nd time I heard someone mention MC2.1 and not 2.0. Did they make a adjustment to the formula I missed?

mmm, seriously, i do relate to what ur sayin, lol...i know there'z an "answer"...somewhere...but me brain jus ain't clicked on it yet i'm constantly askin me girlz just what it is they're tryin to tell me...but sadly, i've yet to fully learn their dialect, lol it'z tricky one fer sur and ya, mc did make an adjustment with the v2.1, but sorry, me can't remember what it was exactly ppp

 

[Waira]

Hi CD', long time! (fortunately?)

...so, you're using only MC, no Sweet Candy, PK booster (Bud Explosion), other PK boosters? I like MC, but it has some down sides...
IMO, it's too light on P and too heavy on N for bloom stage; many folks here start dialing back the MC and adding in a PK booster... BE is very K heavy, nearly 1:2 ratio of P:K (reformulated recently,...again! I need to check this out, but I think it's still close to this)... During bloom, there's some solid evidence that during early to mid/late bloom, higher P to lower K ratio is better, and for finish, the opposite... K, S, Mn are more critical at this point for rich terpene production....
The hitch is, cutting back on MC also cuts back on everything else: secondary and micronutes, along with the myriad supplemental goodies.. BE is pretty much just P and K, and I see some folks going to another more nutritionally complete PK booster and/or better ratio's; even a base bloom nute to use in conjunction...
Another thing, it's harder to assess MC's ppm richness because so many other things are in there (besides nute salts), including non-ionic stuff that doesn't register well on TDS/EC... 3g/gal is about half strength? -- based on 1 level tsp = 6g ... this is a pretty mild solution....
OK, symptoms look mainly K related, but P and Mn defc. are suspect too... the hitch is, both K defc. and K-toxicity present nearly the same! ...classic tip and margin teeth burning... If that 3g of MC is all there is, I'm leaning toward defc. not toxicity... the secondary late showing symptoms are more uncertain, but I'd say that's Mn defc. acting up...
this makes some sorta sense---> behold Mulders Wheel of Confusion!

>>> again the bitch with MC is you can't up the needed nutes content w/o piling on the unnecessary extras, which often as not will be detrimental! This can be magnified more so because this is hydro, not soil (different availability behavior with pH, etc.)....
Can you get an EC/TDS reading of your res'? ...Be sure to calculate in the water's base 200ppm as well (that's a bit high in mineral content; consider cutting it with RO/Di to about 100-150ppm)... I would also consider a PK booster (BE would be good at this stage) and a micronutrient supplement (Earth Juice Microblast)....

 

[420Forever]

Hi CD', long time! (fortunately?)

...so, you're using only MC, no Sweet Candy, PK booster (Bud Explosion), other PK boosters? I like MC, but it has some down sides...
IMO, it's too light on P and too heavy on N for bloom stage; many folks here start dialing back the MC and adding in a PK booster... BE is very K heavy, nearly 1:2 ratio of P:K (reformulated recently,...again! I need to check this out, but I think it's still close to this)... During bloom, there's some solid evidence that during early to mid/late bloom, higher P to lower K ratio is better, and for finish, the opposite... K, S, Mn are more critical at this point for rich terpene production....
The hitch is, cutting back on MC also cuts back on everything else: secondary and micronutes, along with the myriad supplemental goodies.. BE is pretty much just P and K, and I see some folks going to another more nutritionally complete PK booster and/or better ratio's; even a base bloom nute to use in conjunction...
Another thing, it's harder to assess MC's ppm richness because so many other things are in there (besides nute salts), including non-ionic stuff that doesn't register well on TDS/EC... 3g/gal is about half strength? -- based on 1 level tsp = 6g ... this is a pretty mild solution....
OK, symptoms look mainly K related, but P and Mn defc. are suspect too... the hitch is, both K defc. and K-toxicity present nearly the same! ...classic tip and margin teeth burning... If that 3g of MC is all there is, I'm leaning toward defc. not toxicity... the secondary late showing symptoms are more uncertain, but I'd say that's Mn defc. acting up...
this makes some sorta sense---> behold Mulders Wheel of Confusion!

View attachment 1152921

>>> again the bitch with MC is you can't up the needed nutes content w/o piling on the unnecessary extras, which often as not will be detrimental! This can be magnified more so because this is hydro, not soil (different availability behavior with pH, etc.)....
Can you get an EC/TDS reading of your res'? ...Be sure to calculate in the water's base 200ppm as well (that's a bit high in mineral content; consider cutting it with RO/Di to about 100-150ppm)... I would also consider a PK booster (BE would be good at this stage) and a micronutrient supplement (Earth Juice Microblast)....

um, forgive me stoned ignorance, but what is BE plz ppp

 

[Garage_Grower]

Bud explosion :smoking:

 

[420Forever]

Bud explosion :smoking:

ppp

 

[bakEQuatorial]

I have this too but am in soil. In my opinion, the burnt tips and dark green non affected leaves shows a toxicity. I have not fed more than 3g per gallon and still got this toxicity. Not all plants behave like that though. The toxicity locks out nutes and screws with PH, causing this to happen. Only thing that don't make sense is that you are in hydro. If your oxygen pot system uses a fabric pot and your medium is soil or similar, I am betting its a lockout from salt build-up. Check your outer fabric pot when its dry. Do you feel the coarse salt build-up at bottom? Is your runoff ppm really high? If so, you might need to feed plain phed water for a while. I see improvements in as early as 24 hours when i do that. Except mine is not ebb and flow so i water to runoff.

If you're not using fabric pots or soil like medium, forget everything i said lol

 

[Sour D]

Does it start at the top of plant or at the bottom?