Odd fan leaves - help please

[Dr. Babnik]

OK this is my Sumo WW Original, coming up to... 8 weeks I think. What's with these leaves? Is it rust? Neither of the other two plants in the tent are affected. Sorry it's a bit blurry, but you can probably see the discolouration.View attachment 670415
Any ideas folks? Should I be worried?
Setup: 133W total CFL, tent temps 24-26C, one feed of Bloom given so far but otherwise plain water when pot's dry beyond the one-knuckle depth. If you need more info let me know.

Seems like regular Ca and Mg supplements would benefit your plants.
I always supplement these ions i many forms:
Soil ammenment: dolomite, CaMg(CO3) and epsom salt (MgSO4).
On leaves: Rocket Fuel foliar spray (Big Plant Science)
In the soil: Epsom salt sol'n 35 mg/ml, CalMagXtra (Advanced Nutrients)

 

[stepside]

A good way to help.. before you start your next round get some oyster shell dust you can get a box at the grow store and mix some in your soil before you start... Just a little food for thought

 

[Waira]

... well, there's nothing I can think of for Ca as a home remedy that's fast enough and foliar-applicable,... well, molasses can be used, but in bloom, the mold risk is too high because of the sugars,.. it's great in the soil though! Ca, Mg, K a little Fe,.. 1 fat tsp/qt,... anything lime related, shells, are way way too slow to be of help for treating a defc. unfortunately,...
Ah, pardon the jargon mate! Stoma, or stomata (plural) are specialized pores surrounded by two Guard cells that control their opening/closing,... this is how gas and moisture is exchanged on the leaves. So when you foliar spray, stuff can only get in via these pores, when they're open, and when in liquid state,... most stomata are on the bottoms of the leaves, so spraying there is important for effective treatment,...

 

[Eclectic Elle]

I've managed to get some liquid calcium fertilizer - just calcium. There was nothing like CalMag or any of the other brand names mentioned, in the grow shop. I didn't see anything like oyster shell either. Would I be able to use the liquid calcium as a foliar feed? Don't see why not, myself. All it says for application is: To be applied as a calcium fertilizer, amongst others, in the case of a calcium deficiency. Or as a supplementary remedy to stimulate the growth. Dosage: 1-2ml per 1 litre water.

@Waira no it wasn't the biology terms that I had to re-read, it was the stuff about wetting agents LOL. All good now though! And working out what bits are advice and what are product names still takes me a little while as I've not come across most of what's mentioned on here due to my location (and I rarely ventured into a grow shop in the UK). Cheers dude!

 

[Waira]

sure, that will work! What's the label say on it's Ca% and source? Typically, foliar goes about 1/2 strength,.... let's see what in the bottle first though..

 

[Eclectic Elle]

OK here goes:
The front label says 15% Ca
The rear label says 11.6% (m/m) CaO and chloride-free
Proceed with caution, calcium overdose can result in magnesium deficiency (summary)

Liquid calcium can be immediately absorbed by the plant and directly fortifies the cell tissue. Liquid calcium fertilizer can be mixed with other fertilizers, except when in concentrated form with fertilizers containing phosphate, citrate and sulphate.

Doesn't say anything else. This is the stuff though: http://www.canna-uk.com/mononutrients

 

[MedGrower]

OK here goes:
The front label says 15% Ca
The rear label says 11.6% (m/m) CaO and chloride-free
Proceed with caution, calcium overdose can result in magnesium deficiency (summary)

Liquid calcium can be immediately absorbed by the plant and directly fortifies the cell tissue. Liquid calcium fertilizer can be mixed with other fertilizers, except when in concentrated form with fertilizers containing phosphate, citrate and sulphate.

Doesn't say anything else. This is the stuff though: http://www.canna-uk.com/mononutrients

I use Canna MONO Mg and Ca regularly. Last I used it in foliar was 0.5ml per litre each and it went down alright. For regular watering, I think you only need 2ml per..say 7 litres of water to get enough, really. It can raise the EC quite a bit.