The leaves on one of my plants are really starting to yellow. To me, this looks similar to pictures of plants in late flower, rather than the examples of nutrient deficiencies. Have I read this correctly, or should I start worrying?
You have probably another 2-3 weeks left, try adding a feed to next watering - it may have little effect at this point but may pick her back up if she isnt as close to harvest as you would estimate.