Help me diagnosis a possible issue with these leaves

King Kronic

King Kronic

Member
Plants 4 weeks old today (autoflower)
Coco coir / perlite (70/30)
Watering (RO water) every other day w/ Mega Crop dry nutes (1/2 teaspoon) 1.2 EC

Mars hydro TSL 1000 at 25% intensity about 2 feet above canopy

I’m thinking that I’m over watering a bit but I can’t put my finger on that discoloration I’m seeing in the leaf. Perhaps magnesium issue?

Thanks for any advice!
 

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Hook Daddy

Hook Daddy

Well-Known Member
I don’t think your over watering. I grow in coco/perlite and have a recirculating system that runs 4 times a day for 15 minutes. Check your ph, but if using ro water it’s probably ok. Use cal mag if not already, ro water has none obviously. I don’t use dry amendments so can’t help much there, but if using GH or something similar it’s near impossible to water coco/perlite too much.
 
King Kronic

King Kronic

Member
HydoDan said:
Are you supplementing cal/mag with the RO water?
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Thanks for the question. No I’m not. The megacrop I’m using is suppose to be a “all in one” supply. However, I’m seeing a ton of mixed reviews on it so I’m not confident in that. Does the leaf look as if it could be a cal/mag issue? Thanks again
 
King Kronic

King Kronic

Member
Hook Daddy said:
I don’t think your over watering. I grow in coco/perlite and have a recirculating system that runs 4 times a day for 15 minutes. Check your ph, but if using ro water it’s probably ok. Use cal mag if not already, ro water has none obviously. I don’t use dry amendments so can’t help much there, but if using GH or something similar it’s near impossible to water coco/perlite too much.
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Thank you for your reply and for that information, I really appreciate it. Now, I’m wondering if I’m watering too little then lol. I think I’ll go ahead and try adding cal/mag see if that does the trick. Are you feeding every watering?
 
King Kronic

King Kronic

Member
Thank for you the question.

6.3 Ph and 900 ppm.

BUT that’s because these last 3 waterings I’ve given them straight Ph water with cal/mag because the run off ppm before was around 1600-1800. So I think my issue was perhaps nitrogen tox and cal/mag deficiency. I could be totally wrong but that’s what my research is telling me. What are your thoughts?
Thanks again!
 
OneMoreRip

OneMoreRip

Well-Known Member
Sounds really high for r/o. Ph okay ppm way to high.

I like 700ppm (always, start to finish), with r/o and I’m even at that using 300 ppm tap now. 6 ph but mine usually rises so I start 5.6 or 5.8 and you get some movement in ph which is according to some good.

just my opinion.

For my meters 1600ppm would be Around 2.0 ( possible a bit higher), ec. But apparently there are different ppm scales which is why I think ec is preferred. I believe 1.3 ec is ideal when everything else is dialed in.

could be wrong about everything but I don’t think so
 
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