Yellow Blotchy Leaves - Nitrogen Deficiency?

[fauslyfox110]

Hey guys,

I’m growing a wedding cake autoflower (RIGHT in picture) which has slowly been lightening green. I am noticing blotchy yellow in the lower leaves as well as yellowing on the top. Compared to her neighbor (LEFT) you can see the difference in the images on how bright green she is. Both plants are feeding from an automated water tank that runs 2 times a day for one minute. I am going to replace the feed because I noticed the ph moved up higher than i had originally thought it was at.

I am unsure what the deficiency could be or if this is nutrient lockout? Tips for how I should approach to fix the issue?

Below are my stats and some pics:

Grow Environment
Place: grow tent
Start date: 3/20/23
Temp: ~ 75 degrees
Humidity: 55%
Medium: 80% coco coir 20% perlite that’s been buffered
Nutes Type: currently on general hydroponics maxigro bloom 5-15-14 at 50% strength

Water Source pH: 6.4ph (I had set it to 5.9 but it seems to have moved up)

PPM: 443

Other: I have two fans running in the tent, one to create air movement, the other to exhaust

[MidwestGuy]

Welcome to the forum.

Can’t see color and texture of the plant with the purple lighting. Please post photos taken in natural or white lighting.

@fauslyfox110

6.4ph

You want a runoff pH of ~5.8.

@fauslyfox110

443

You’ll need to feed more if your runoff is at 443. It should be ~1,000.

We can give more specific recommendations if/when better pics are posted.

[Ebb]

Agreed. Your ppm is way low and shoukd be closer to 800 to 1000 ppm at this stage. Raise that and you should be fine

[CMichGrower]

Are you using cal-mag?

[OGIncognito]

@fauslyfox110

PPM: 443

Bump that up to 800-1000. During the fertigation cycle do you get run off and does that run off go to waste?

[fauslyfox110]

Thanks guys, sorry for the pictures, I added two more that I think show the issue more clearly. The leaves aren’t in terrible shape, they just have these light blades of light green and I want to nip it in the bud. At the moment I only have GH so I’m going to stick to it, but I will increase the dose which should correct the ppm levels, was afraid to drown them in nutes.

[fauslyfox110]

I am not, but planning to add a little of that to the feed im remixing

[CMichGrower]

I’m surprised you got this far without cal-mag. Anytime you grow in coco you need to add cal-mag with every feeding. The light color between the veins is early calcium deficiency.

If you use RO water you need cal-mag with every watering too.

[fauslyfox110]

glad it’s early, i will add some cal mag to my resevoir feed.