What causes clawing

Menace805

Member
Im growing outdoor in roots original soil.
Nutes: fox farm trio for soil
Also using cal mag from botanicare
I always ph my water when feeding..i feed once a week and if plants are dry use ph'd water with cal mag in between feedings..i started using a qt of the recommended dosage then went to half gradually..this one plant seems to be the finicky one the others look good with no clawing. Just this one plant
 

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It looks like N abud but my plants show this when they experienced cold night or have low temp in the root zone... They look really nice btw
 
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