Watering: I have my 3 hop plants on 1 gal/hour emitters each ran every 4 or so days for about 45min on average.
Fertilizing: Only fish emulsion. It's been applied from a one gallon jug mixed with water and split relatively evenly between the 3 plants.
Mostly yellowing around the lower 1ft of plant
Closeup of leaves
Thanks for all your help. I should also mention the temperature (as it's been in most places lately) has been in the mid 90s to near 100s.