The irony of water is on one hand your hops want water, on the other to much water and you can wash your nutrients away. I have in the past, over watered my hops. I've never drowned them, but I have starved them.
In addition to standard nutrients like the above post suggests, I'm a fan of taking wood ash from a fire and adding it to either compost or directly above (lightly) my hops. Wood ash has a little bit of everything and is a great amendment to compost/soil. Last time my leaves looked like that I did wood ash and nutrients.