Ark. Agricultural Experiment Station | Flickr
University of Arkansas. Good cotton, rice pics.
Library: U.S. Department of Agriculture | Flickr
Probably the best place to look for ag photos.
Library: Granger Academic
Good for historical photos. Free for educators, you just have to create an account to download pics.
Photo: Oats & Corn Strip Cropping in Iowa | keeva999/Flickr
Photo: Food Barcode Scanning | usdagov/Flickr
Oklahoma. Concept for traceability, blockchain.
Album: McKee-Beshers Wildlife Management Areas Sunflowers | usdagov/Flickr
Nice pollinator, insect, sunflower pics
Album: Food, Nutrition, and Consumer Services In Washington D.C. | usdagov/Flickr
Album: Salmon | usfwspacific/Flickr
Photo: Drone in Louisiana| usdagov/Flickr
Photo: Cow Ultrasound Michigan State University | usdagov/Flickr
Photo: IoT Device Connection | usdagov/Flickr
Photo: Cattle Ear Tags at Kansas State | ksrecomm/Flickr
Album: Precision Agriculture Frick Farms | usdagov/Flickr
Library: Wisconsin NRCS | Flickr
Library: US Department of State Photo Archive | Flickr
Library: Land Between the Lakes KY/TN | Flickr
US Forest Service, Kentucky and Tennessee
Album: FNS-Farm to School at Royalton-Hartland SD in Niagara County, New York | usdagov/Flickr
Library: California kqedquest | Flickr
Not strictly ag pics
Library: Indiana Tom Britt | Flickr
Not strictly ag, but good photos of food, everyday living (which of course includes ag products)
Album: PA Good Harvest Farm Blossoms from Energy Savings | usdagov/Flickr
Pics of using energy, water
Album: Nonlethal Methods for Wildlife Damage Management | usdagov/Flickr
Library: New York NRCS | Flickr
Not that many pics, but some adorable calves and good people pics.
Library: New Mexico NRCS | Flickr
Library: Oregon NRCS | Flickr
Library: Montana NRCS | Flickr
Album: Scotland – Food, Feed, and Crops | Flickr
Stock photos of food (for human consumption), feed (for animal consumption) and agricultural crops. Technically Scotland though...
Library: Massachusetts – Terry Donovan | Flickr
Beautiful animal shots, often closeup portraits
Album: Massachusetts – Chickens, Terry Donovan | Flickr
Library: Texas NRCS | Flickr
This isn't the most organized library, but can be good if you know what you're looking for.
Library: Georgia – UGA CAES/Extension | Flickr
College of Agriculture and Environmental Sciences, Georgia