What is this?? Outdoor Bubblegum Grow 2011. Is this a Cal-Mag problem??

First outdoor grow.

Bubblegum plants in 5 gallon buckets, promix soil, fox farm nutrients at half strength once a week.

First it was only one plant that started looking like this, now everyone has started showing signs...
I think its a Cal-Mag deficiency, but I'm too new to know for sure...

Can anyone help me determine what it is so I can fix it please!!!

if your using the FF liquid trio, and tap water, there should be a good amount of Ca and Mg and even iron, for a decent sized plant....but bigger plants will need more in a cal/mag supplement, my indoor plants need the "advanced feed" of 2 tsp cal/mag every watering, and that is actually starting to look like its not enough...but i wouild say, first bump up your feed to full strength and see how that works out for that hungry girl

EDIT: i forgot to mention that it lookd K def

I should have mentioned that of the five plants, four of them are around 5 1/2 to 6 feet.
I have one who is a little runt compared to the others, she stands at around 2 1/2 to 3 feet and was the original shower of the deficiency problem. This morning I used some eggshells and epsom salts in the ph'd water. I also added a nail, for a little iron.
The thing is, I did a nutrient soil test and although I think the one I used (CIL) is hardly accurate, according to the reading - it also shows a little low in the Potash rating.
At first the leaves yellowing was very slow, now its rapidly picking up speed as we've just moved into budding stage...
I just dropped the Grow Big from the feeding line-up and now am adding the tiger bloom, and big bloom.
Thanks for the tip. I will try to find a potash supplement and see if that works.

keep growbig in the mix...use it at 1tsp. till like week 6ish.... and use your tiger at 1-2 tsp, and bigbloom at 2tblsp...thats what the feed chart suggest, in exception for keeping growbig, but MJ needs more Nitrogen than in most flower nutes..but those 5 ft monsters are prolly starving at 1/2 strength FF...

EDIT: also, my SLH is my smallest plant, but it also uses the most Mg and iron, a total whore... so thats why is shows def b4 my other strains, even tho its almost half the size

What brand of CAL-MAG do you recommend?

novice11 said:

What brand of CAL-MAG do you recommend?

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iv only used botanicares, works good and easy to use...but i want to try some other brands at some point, i think they all should be alright tho

Bublonichronic said:

iv only used botanicares, works good and easy to use...but i want to try some other brands at some point, i think they all should be alright tho

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What about eggshells and epsom salts? alot cheaper...

Nic Rails said:

What about eggshells and epsom salts? alot cheaper...

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i dont personally use them, mainly because the shit is more plant accessible in the supplement...but i dont see any reason they wont help, just dont over do it..

Thanks for the info. I've gone full strength with the Fox Farm this week, seems like the yellowing has slowed or maybe its just my wishfull thinking...