Indoor Always issues around this time of the grow. Not sure what the deal is

[JayGeeCanuck]

I

The middle leaves on this plant seem to be the worst. Ph has been good. The other plant fed off the same reservoir doesn't look this beat up...but it's slow to flower. Runoff ec is similar to inflow(~630). Runoff ph was 5.4-5.5. I just started doing plain water every 3rd fertigation ( as Remo nutrients recommends). I was thinking maybe too much light, but the other plant.is fine, and ppfd was at most around 700(I've brought it down to the low 600s). I had a similar issue last grow, but only got a ph pen midway. I figured that by obsessively monitoring ph, i was going to make it through the 3rd week of flower without issues.
What could it be?

 

[Bob's Auto's]

What medium are you using?

 

[JayGeeCanuck]

What medium are you using?

Coco

 

[elcoloan]

don't bother with runoff pH in coco... but very important to have proper pH going in... so, where is your input pH usually at? and what do you put in your water?
and... not sure why they'd recommend plain water for coco, but it's said around here that you never water coco with plain water.

 

[JayGeeCanuck]

don't bother with runoff pH in coco... but very important to have proper pH going in... what are you pH at? what do you put in your water?

Trying to target 6.2-6.3.

I tried using half tap water/half RO for my first res change to bloom nutes ( used RO only during veg)Ph was constantly rising, needing ph down every 12hrs. Ran through that in about 5 days. I also added some enzymes to the res, maybe that messed with something?



Next batch just used RO.

Been mixing the Remo supercharged kit @ 0.9mls/liter (a little less than half of what remo recommends). That's the micro,
Bloom, magnifical, Velokelp, nature's candy and astroflowet. Fertigation every 12hrs or so until runoff.

Initial ph was 5.7. Next day, first fertigation it was 5.9. Crept up by 0.2 or so every day. When it read 6.4, I added some ph down to bring it to 6.1. Last couple of days its been about 6.3.

I have 2 small airstones in the res, and a stir pump that turns on for 1 minute every hour. Res. temps are 19-20c.

 

[tronN00dles]

The 630ec is what unit exactly? uS/cm, or 500-scale ppm, or 700-scale ppm?

 

[JayGeeCanuck]

The 630ec is what unit exactly? uS/cm or 500/700ppm?

Us/cm ( so roughly 315ppm)

 

[tronN00dles]

Us/cm ( so roughly 315ppm)

I would think that’s too low. Try bringing that up to 500-600ppm. Plant looks hungry. I had a similar lime green, crusty leaf situation going on with a previous grow that I was feeding 350-400ppm. The color bounced back a fair bit when I bumped my feeds up closer to 550-600ppm.

 

[JayGeeCanuck]

I would think that’s too low. Try bringing that up to 500-600ppm. Plant looks hungry. I had a similar lime green, crusty leaf situation going on with a previous grow that I was feeding 350-400ppm. The color bounced back a fair bit when I bumped my feeds up closer to 550-600ppm.

Remo does come in lower than most nutes. I've been reluctant to go higher because of issues in other grows, so Im paranoid. Lol.

They're also sativa dominant which are supposedly more sensitive.

My inclination is that its a real deficiency, I just don't wanna burn em if it's something else.

 

[Mañ'O'Green]

This happens to me all of the time. I feed 6 girls off the same res and at least one will be fussy. It looks like a Potassium and Magnesium deficiency or lock out? They look the same. If it is a lock out then the likely culprit is Cal-Mag but you are feeding a fairly low PPM and not all elements may be in balance. This could lead to an actual shortage in P-K-Mg. This is what I believe is the problem bump your PPM up to 600, add 1g Epsom Salt per gallon. Use the Astroflower in your mix.