need help asap

[greenfiend]

i have been having this problem lately were my big leaves are turning yellow with purpleish brownish spot my temps are about 57f to 65 at night and 70 to 78 in the daytime personally i think its nitrogen def or magenesium def but im no expert its my first grow help will be greatly appreacited and is it okay to rip the leaves of like that

 

[guineapig]

Is this typical of all fan leaves, even the largest, most recently-formed fan leaves?

 

[greenfiend]

the plant the not really have that large fan leaves any more but the medium sized ones are are green but not a dark green there more like a green with a hint of yellow what kind of fertilizer can i buy to fix this problem that you can buy at walmart

 

[Ono Nadagin]

pics arenot the best but from what I can make out, it looks like Mag Def to me...

 

[HeadyPete]

More info please.

What have you fed?
How old are the plants?
Lighting?
Water runoff ph?
Soil? What kind? Any additives?

I think the temps at night are a little chilly, that might explain the purpling. What are the growroom conditions? Plants sitting on cold floor?

Definitely a deficiency or two there. Hard to say if it's because you are not adding enough or there is a ph problem causing nutes to become locked up and unavailable to the plant. There may also be an overwatering/poor soil drainage issue but hard to tell from removed leaves.

As for ferts, look for something organic or near organic. A balanced formula for veg (3-3-3 or something) and a high phosphorus/low nitrogen (1.5-8-4 for example) for bloom. Get some epsom salts from the pharmacy section and mix 1 tsp/liter for magnesium. Organic ferts are less concentrated (lower numbers) that most chem ferts so they can be used more often without burning and fert buildup.

Please post some shots of the entire plant. Try to shoot plants on a white background. Hard to judge colour of leaf on wood table. Helps to see overall condition of the plant. Each leaf you rip off is a source of energy for the plant so it's not good. Plus, ripping is bad and can introduce disease into wound. Use sharp knife or scissors.

I don't want to recommend any action until I get some answers to these questions.

Thanks.

 

[keeko]

you should problably leave the fan leaves on the plant too.....thats where the plant stores all its food and energy