Mechanization has made the farming of many crops — lettuce and tomatoes among them — a lot less labor intensive. But some crops are still tended and harvested by hand, and it can be painstaking work.
How do you measure the labor intensity of crops? We thought there would be an easy answer to that, but there isn't. Some agricultural economists talk about labor input in terms of hours per acre, but that may not take into account the difficulty of the labor.