Payload is whatever you (or your startup) want it to be.

For me personally mechanical between row weeding is step one, then laser in-row weeding.

1. These on some linear actuators: https://www.getearthquake.com/products/fusion-drill-powered-... (they work surprisingly well)

2. Beyond that for in-row weeding a engraving laser on a Delta: https://github.com/Agroecology-Lab/Open-Weeding-Delta/tree/m...

Or if I'm feeling rich by then this third party weeder looks pretty good https://github.com/Laudando-Associates-LLC/LASER

3. For Seeding my salad crop https://reagtools.co.uk/collections/jang

4. Harvesting my salad crop https://reagtools.co.uk/products/quick-cut-greens-harvester

I live on a farm, I have sold salad commercially, these are largely tools I already use and own, just moved about by motors rather than muscles.

This is a smaller scale thing than arable. We're talking a step up from manual horticulture (which is actually what still feeds much of the world)