redux: Advanced Mg defiency?

[GirlWonderGrows]

Ok, so I'm not going to post too many details about my setup unless you really need them, just lots of fotos. These are from 2 diffrent locations, so hopefuly everything is clear.

I'm using PBP and black gold potting soil. I've noticed this necrosis on several plants, and I'm thinking its Mg, but I havn't had problems in a while. Perhaps from nutes settling. Effected plants seem to be in both flower and veg stage, and some strains seems to be getting hit worse than others.

Here are pics:
In veg 1st location:









In flower 2nd location:








Isolated Leaf from Flower:




I'm sorry for not posting more info right now, I'm very tired and need to get this figued out, Thank you very very much in advance for your help.

GWG

 

[MTF-Sandman]

What's your PH info and what's the water source/PPM?

 

[Core]

i think i got me the same problem once....it looks like these plants are going 2 some severe ph changes or have been.....plants getting light spots alll over old leaves....'but this is just a guess at my end...'!
and without ph i realy should't say anything.....

 

[GirlWonderGrows]

Water source is tap water, fairly clean as far as that goes. City report says between 7 and 12 ppm, the ph is between 7.2 and 8.2, I have not 'dechlorniated' water by letting it sitting out. I don't really have any way of determinign my soil H, the best I have is one of thoes shitty meters you stick into the soil. I could do a test if you'd like, but I'm not sure they are very accurate.

It seems you are saying this looks more like a pH issue than a Mg def? I have been spraying the plants with the hose quite a bit, and that is how they often get their water, rather than being given PBP. I've been meaning to set-up a dechlorinzation station, but just havn't gotten around to it yet.

Thank you for the help so far and let me know if there is any more info I can get for you.

GWG

 

[GirlWonderGrows]

update, more photos

update, more photos

Ok, so the chronic plant that I posted pictures of last night is going down hill fast, there is a picture of that as well as the other plants. Also my ghetto ph meter, saying I'm right at 6.4, as it always does.

Chronic:




Others plants (pagan, made up name I belive)




Ph meter:



Any input greatly aprreciated, I'm about to go get some dolimite lime and Epsom salts and try a bit of both. Let me know what you think!

GWG

 

[Guest]

dirty girls

 

[GirlWonderGrows]

Oh, why are they dirty?
ANd can anyone give me a recomendation for the lime application? I want to go ahead with it tonight. I got "Lily Miller SweetSoil fine grade dolimite lime" - and I notice it has tons of Mg in there. Does that mean I don't need to add and epsom salts? I'm going to assume it does, and just use the lime for now.

GWG

 

[20kw dreams]

Definate N deficiency, and it looks to me like thier might be a tad Mg and Potassium, but it could just be the lighting in the pics and/or necrosis from the N def.

First thing you should do is check your ph and be sure you aren't overwatering a tad, as this can bring about N defs. Ph should be anywhere from 6 - 6.8. If those 2 are in order, raise your nutrient strength a couple hundred ppm, or 1/4 strength. This will clear up your problem, assuming your ph is in the clear.

 

[GirlWonderGrows]

thanks, 20K, would you recomend not doing a lime drench?

I've got the lime...

 

[Maxhouse]

It's a calcium and magnesium deficiency.. Take a look here :

http://www.icmag.com/ic/showthread.php?p=727722#post727722

http://www.advancednutrientsmedical.ca/forums/showthread.php?p=177433#post177433

You must use a fertilizer for soft water.....

 

[BowlPacks]

It's a calcium and magnesium deficiency.. Take a look here :

http://www.icmag.com/ic/showthread.php?p=727722#post727722

http://www.advancednutrientsmedical.ca/forums/showthread.php?p=177433#post177433

You must use a fertilizer for soft water.....

Yup, add some cal-mag to your mix, and mabe give them a SLIGHT up with your pbp, you'll be good. Dont freak out bro!!
P.S.- Setting up a "dechlorination station" is a good idea, not necessarily because of the chlorine but so your water is room temperature. If your feeding them h20 that is cold there gonna get stressed...

 

[gratefuldawg]

Your ph meter is f-ed up. Pureblend brings my water down to less then 4 sometimes. I'd say, go get a nice digital ph meter, add some cal-mag, and adjust to around 6.4-6.8 after the nutes are mixed in and you'll be good. Try 3-5ml cal-mag per gallon. Definately add the lime if your not gonna get a ph meter, but I'd go with the meter.

Your city water rules, I'd love to be where your at. Mines well over 500,lol.

 

[TNJed]

My city water runs at (+/-5) 100 ppm. Lucky me, huh? I would have to agree with the above posts: get a firm handle on your ph and add cal/mag to account for your super-soft water.

 

[Blackmelo]

You have got a completely wrong ph. I bet that ph dial thingy you have will read a ph of 6.5 from 4 right through till 8. They are useless.