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How do your other plants look? How much sun does it get? I would do a general feed with some seaweed extract like Maxicrop and Fox Farms "Grow Big" 6-4-4. Throw in some lemon juice, a good 1-2 tsp/gallon, if you suspect your soil isn't quite the right pH. Lowering the pH of your feed will help the roots pick it up and I would recommend it if you are growing in a soil of pH greater than 7.

If there was any chance you were over feeding or your soil had been over amended, I would flush well with just the lemon and water and then let the soil dry out.

Either way, if you guessed right, you should see healthy new growth over the next few days. Don't worry about the already yellowed leaves, focus on the new growth when tracking plant health. The plant will basically abandon most leaves as it sucks the resources from them and they yellow. It wants to grow big right now so it will do that when you fix the problem and not go back and fix old stuff (generally). Those leaves can probably be taken off in a week or two as the plant resumes healthy growth.

"The Homebrewer's Garden" was a great book for getting me started. I have four hills with two rhizomes each of chinook and cascade that are currently on their 5th year, and doing great. I have 8 lines (set up in four "V" patterns) going 25' up the side of my barn's southern facing wall ( check it here ) and that setup has worked great for me so far.

edit: That photo was taken before we raised the ropes up, they're about 12'-15' there.

"Hop Production" and "Hops" are the two I'm familiar with. Both written by industry folks and are solid. "Hop growers handbook" was put together by a guy who was just getting into hops a few years back, and the Guide to Hops & Malt I've never seen. https://www.amazon.com/Hop-Production-Developments-Crop-Science/dp/0444987703. There's some others out there but for the most part they're written by folks who don't actually have a working knowledge of hops but are happy to take your $$, haha!

Looks like mild nutrient deficiency. They are first years, right? I’m not sure if they have osmocote fertilizer where you are, it’s a slow release pellet that contains nitrogen, phosphorous, and potash. It’s made specifically for flower and vegetable plants. Sprinkle a small cap full around the crown and it should clear it up after a few weeks. Note the new leaf growth, if it’s normal looking, without the burn, you’re good. Hops are very heavy feeders and need a lot of food in that soil. Here is the amazon link osmocote

I use the trays from my dehydrator placed on top of a box fan to dry hops. It works very well. If you have a dehydrator, you may want to try that. It saved me from building framed screens.

You can try this: https://smile.amazon.com/gp/product/B00192AO90/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Low PHI. I used this on spider mites and it worked wonders.

I just planted some rhizomes last year, so I'm hardly an expert!

I learn a log from following these guys: http://www.greatlakeshops.com/hops-blog. They are more geared for commercial endeavors, but I've learned a lot from reading them. I also follow them on Facebook.

Also:
http://msue.anr.msu.edu/topic/info/hops
https://www.amazon.com/Homebrewers-Garden-Easily-Prepare-Brewing/dp/1580170102

I also watched whatever youtube videos I could find about hopgrowing.

https://www.amazon.ca/Hop-Growers-Handbook-Sustainable-Small-Scale/dp/1603585559

Ladybugs!!!