How do I complete the Infected Farm?

On my way back to Ranger Citadel from the AG Center, I was told to go to the Infected Farm, so I did. I killed all the enemies, looted all the loot, and whispered all the cattle. The only object I seem to be able to interact with at this point is the water resevoir, seen below:
But, whenever I try to Use it, the text panel just prints:
Looks like you can pour fluid into the resevoir through the intake valve on its left side. From there it should get pumped throughout the entire area.
My only other option is to Examine, which prints:
There's a small valve on the left side of this fertilizer resevoir.
There's no valve that I can find to interact with, which I think I confirmed by opening the skill wheel and it can only cycle through one object, the resevoir.
How do you complete this area? I can't tell if this is a bug, or if I'm missing an inventory item, or if I've done things in the wrong order. I saved Highpool, if that matters, but I just cleaned out the AG Center as well, which I believe is what triggered the Infected Farm being revealed on my map the next time I entered the wasteland.
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How do you farm infected trophies?
How to farm infected trophies in Dying Light 2. The quickest and most efficient farms are the small purple icons on the map, labeled such as Dark Hollow or Forsaken Store. The game tells you to visit at night because they're a great source of crafting materials but during the day are crammed full of sleeping zombies.How do you farm infected trophies in dying light?
To harvest a fruit or vegetable, point at the plant and press and hold the right mouse button.How do you harvest an infected plant?
In DL2, Infected Trophies are a guaranteed drop from those Infected, marked as a blue 'Encounter' on the map. So kill the Infected and then search the dead bodies for the Infected trophies. Besides that, killing all Infected enemies will also have some chance of dropping Infected trophies.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Brett Jordan, Ketut Subiyanto, Edward Jenner, Max Vakhtbovych