Asparagras is a limited time crop. Only viable for a few days to a week, or so. Some of the farmers around here have a sledge with a very sharp blade on the front. Hitch it behind the tractor and go like the dickens! Maybe another pass in a week or so. Others have a motorized cart with wings over the rows. Workers ride the wings, hand cutting the shoots by hand - very labor intensive.
String beans, green peas, pretty much mature at the same time. Lots of those grown here for a nationally/world known baby food manufacturer. One pass harvesting with a crew of harvesters.
See them parade by here complete by with self contained portable shop, passing between the various fields. Lots of dump trucks full of product.