Is this the start of nitrogen deficiency? Pics

[GodtyrLoki]

Hey guys, I woke up to check my plants after a watering session last night and noticed the bottom leaves on one of my plants are starting to lighten up in colour ... which from my research seems to be indicative of a nitrogen deficiency ... I just thought I'd post up some pics for some of the experienced growers to confirm my suspicions of nitrogen deficiency. I have had them on a quarter strength nutes and am wondering if now is the time to start bumping up those nutrients ... my tap water is 250 ppm and i usually cal-mag to 400PPM and then nutes upto about 650/700 ppm.

 

[Kongfuzi]

That’s a lot of nutes for a little plant. The bottom leaves are obviously yellowing because it’s getting zero light, as the giant fan leaves above them are taking up the light.

In other words, back off the nutes, maybe invest in an RO filter, and you’ll be fine, there’s nothing wrong with the plant.

 

[dakotamoon]

What are the other parameters? Rh %, lighting, coco/composition, what nutes, strain, how big of an tent ? .. Plants look fine but We need more data!