little brown spots

[DONALD DUCK]

hey ya'l. hoping to find that this is a common problem with a common solution...sorry i cant upload any pics but its pretty easily explained...little dots on the large mature fan leaves...the colour of the leaves is fine and i thought the little dots were just the remains of a past problem that had since gone away but recently it looks like the dots are very faintly starting to come through on some new fan leaves...still only on the large mature ones...

PH=5.5-6

INDOOR GROW

1000W HPS

TEMPS ARE PERFECT

USING A GENERAL NUTE SOLUTION PLUS SUGA RUSH (PROBLEM EXISTED BEFORE SUGA RUSH)

ROOTLS LOOK LOVELY

its about to start week three of flowering

 

I ADDED A SHOCKING PIC, APOLOGIES, I WILL TRY AND GET A CLEARER ONE AND UPLOAD ASAP..

 

P.S I KNOW ALOT OF PEOPLE USE EPSOM SALTS IN THE WATER, SHOULD I BE USING EPSOM SALTS?

Edited July 21, 2016 by DONALD DUCK

[Serrated edge]

Pretty hard to answer that without pics , or even what stage of growth it's at.

[flamstaa]

Brown spots is usually calcium. I'd be thinking about giving your plants some feeds at a higher PH 6 - 6.5.

 

Personally I think 5 - 5.6 is too acidic. I've been having a calcium deficiency along with other problems and I'm going to fluctuate my PH between 5.8 - 6.3 to make sure they get watered at times that can absorb all the nutes. Calcium needs the highest PH of all the essential nutrients to be absorbed by the plant.

 

What's your EC?

[williemac22]

Any pH below 5.8 and the plant will not take on calcium.

That looks like the problem.

There's some great pH charts on google.

They show what nutrients are absorbed at certain values and 5.8 is the best all round value as all nutrients will be absorbed at that level.

 

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[williemac22]

Just saw how old the feed is. Hopefully you got it sorted.

 

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