Nute vurn

[Ryguy]

Hello, could someone give me advice? Is this nutrient burn or light stress. Ppm are at 975.ph is 5.8 I did get the ppm to 1300 but brought it back down when I started having problems. . I was feeding it big bud since week 2 a long with gh Lucas method and cal mag. Super sherb in dwc. In a 5x5. I'm having problems with both plants. It started on the lowest fan leaves. I have 2 led lights in my tent. I thought if it was light stress it would effect the top leaves first. Any help would be appreciated. I'm in week 4 of flower. I'll upload more pics if needed

 

[dirtymike]

Looks like lightning taco's to me.

 

[Bluey]

I'd say the curl on the leaf margin and tip curling up is the start of nute burn, especially at 1300 odd ppm. Some get nute burn at 1000 and even a bit under..

Watch the light but I don't think it's a problem, try and keep air tem0s around 24⁰C at that stage with good airflow.

 

[Bluey]

I'd say the curl on the leaf margin and tip curling up is the start of nute burn, especially at 1300 odd ppm. Some get nute burn at 1000 and even a bit under..

Watch the light but I don't think it's a problem, try and keep air tem0s around 24⁰C at that stage with good airflow.

 

[dirtymike]

Thank you Bluey , I've seen this a couple of times on my grows. I always thought it was light intensity. I see now that the edges are darker and then turn up almost 90 degrees. Fan leaves on bottom should have clued me in.