Magnesium Difficency?

[razzapiggy]

What ya think? It's not really effecting alot of the plants, but the leaves that are effected are in the middle of the plant, not at the top which has me a bit confused.

I have recently added a bunch of fans so I thought the few that were effected was possibly wind burn, but a few more have shown up with a few odd signs...

Had a friend say it looked like mold, I personally don't think that's the case at all.

Using SuperNatural Bloom
pH 5.7-6.0
Medium SunShine#4

They are three weeks into bloom. I will post a few bud shots later on too. They look pretty healthy other than this.

[razzapiggy]

P.S I have a small small small touch of nute burn, just a tiny bit of yellowing around the edges of a few plants...but this is something different. Any opinions welcome.

[amstron]

I doubt its mold. It could be pottasium deficiency as the yellowing seems to be moving from the leaves edges in. Could be magnesium...often in magnesium defficiency the leaf edges curl upwards. If it was a nitrogen deficiency, I'd expect the lower leaves to be yellowing. Have a look at the FAQ's, theres loads of info there

[razzapiggy]

Someone on another site said it looks like nute burn. Why would so few of the plants be effected if it was indeed nute burn? I have looked at the FAQ and various sick plant ID sites, and narrowed the things down it could be. Asking for the opinion of a few vets.

[ProGroWannabe]

I wish I could help, but at least me posting will bump your thread up:). I'm trying to learn deficiencies and symptoms right now too. Good Luck!

[razzapiggy]

Is it nute burn?

[stinkyattic]

No, your pH is way too low and you are locked out. Flush with pH 7 to bring it up to the 6.5-6.8 range and give a final flush with a complete fert. I see primarily the symptoms of Ca lockout but that isn't the only thing you have going on there.

[Opie Yutts]

dirt PH: 6.8
hydro PH: 5.5

[razzapiggy]

How am I way too low on my Ph? I thought Soil-Less growing mediums like it around 5.5? Stinky... I did give them nothing but water for a few feedings but I can still seeing a bit of the browning and yellowing...not a ton. What should I do?

[Opie Yutts]

How am I way too low on my Ph? I thought Soil-Less growing mediums like it around 5.5? Stinky... I did give them nothing but water for a few feedings but I can still seeing a bit of the browning and yellowing...not a ton. What should I do?

Your PH is too high.
Using SuperNatural Bloom
pH 5.7-6.0
Medium SunShine#4

5.5 is what you want, but watch out, plants don't like PH fluctuations either. Change slowly.

[Opie Yutts]

I would keep giving them nothing but PHd water until you see the new growth going nicely without yellowing, then start adding nutes slowly beginning at about 1/3 strength. Look at the charts and use a PPM meter to determine how much nutes too use, or keep increasing slowly until you see small signs of stress, then back it off a touch.

[razzapiggy]

I think Stinky was under the impression that I used soil that's why she was saying the Ph was way too low. My PH is generally right in the correct area (I use the cheap kind of Ph checker so it's hard to get it to to .X but its very close with the color coding)

Perhaps it's time to invest in a ph stick...

I gave em phed water for several waterings, and recently went back to the ferts (2nd watering back tonight) I'm at 600 PPM. Honestly, like 85-90% of the plants aren't really getting that yellowing or browning on the leaves, some of them are a bit burnt around the edges of the leaves (nute burn I believe) Uggh, I am a little frustrated.

[razzapiggy]

P.S New growth is normal color.

[razzapiggy]

anyone?

[Opie Yutts]

If the new growth is normal, that's good news. But watch it carefully for signs of stress. Just keep your PH around 5.5 and your nutes at the proper PPM, and everything should be fine.

Also, did you check the problem charts I (and others) posted in the problem area?

[razzapiggy]

Yeah, I have those resources save on my favorites, and looked at them before posting. It's honestly hard to tell if it's nute burn, or magnesium. They look fine, new growth looks nice... have my PPM at 860 right now. I have about four weeks to go, so I'm going to give them a high Phos. blooming nute (Shooting Powder it's called) for a few weeks, then do a ten day flush at the end. Will post some pictures.

[Opie Yutts]

Perhaps it's time to invest in a ph stick...

They're like less than $25 at the hydro shop, and it would be the most valuable use of your money in your entire set up.

If you have 4 weeks to go there may be little or nothing you can do about the yellowing. It is completely normal in many varieties for yellowing to start about this time in your grow.

[sane]

I think it is nute burns too. what hydro system do you use? do you have all the same clones/strains,or is it of a mixed variety. that could explain why most other plants are not showing symptoms. flush and give a dose of the Advanced product Revive as directed. That will correct any deficiancies if you are locked out.

[razzapiggy]

I only have like three weeks to go so I'm not positive a full flushing will do all that much. Since I want to hit them with the Shooting Powder (high in Phos) very shortly, and then flush at the end, this will set me back quite a little while. Right now I water by hand so flushing would be quite the proccess (next time I do ebb and flow)

It seems most of the plants are now showing signs of whatever this is, but new growth is fine... and the buds are coming along damn quickly... kinda confusing. I have two different strains in there as of now. I just don't get how I'm burning them at 900 PPM..it makes no sense to me.

[FireTheft]

no no ... still flush ... 3 weeks is a ton of time....just because its soiless doesn't mean your ph can't get out of wack.

[razzapiggy]

I gave them nothing but Phed water for about a week, but they might need to get the entire mix flushed out. Because I don't have an irrigation system this requires quite a bit of work... but in the end it may be worth it.

I was just afraid if I gave them a solid flushing, I would need to work up super slowly to 900 PPM... and I wanted to give them the "Shooting Powder" for the last few weeks before giving them nothing but ph'ed water for the last week or so.

I was also browsing through House and Garden's Website...and I realized you are never supposed to introduce their product "Drip Clean" that supposedly will clean out metals from your medium, lessening the need for flushing... well, I introduced it mid cycle which may have caused the salts\metals to be released after they had already build out. So... I am thinking I may be locked out because of that and other reasons.

[Opie Yutts]

It's possible you're locked out, but I still think it could be just normal yellowing. Especially since new growth is good.

[razzapiggy]

Opie...yeah I'm kinda with you bro but I'm gonna go ahead and do a pretty nice flushing anyhow. The yellowing has been going on for several weeks now which leads me to believe I am locked out... not terribly, but clearly the plants are trying to tell me something.

I bought some Clearex and I'll give them enough water so that I get a decent amount of run off coming out of the bottom. I have no irrigation system set up as of yet, so flushing is a bit of a pain in the ass but sometimes it takes hard work to be rewarded properly. Wish me luck!