Disclaimer I am one of the owners of FlyingAg, we sell drones geared towards farmers all over the nation.

For what you are looking to do with it I would recommend a DJI Mavic 2 Pro drone. Great unit, awesome camera, good flight time. Have tons of customers that have these and love them. Expandable to using an automated flying and photo stitching service like DroneDeploy as well.  https://flyingag.com/products/flying-ag-mavic-2-pro-ag-kit