Spraying crops
In addition, Farmers can only spray certain pesticides late in the evening - 'cos of the bees amongst other insect risks. Also wind speed has to be lower than a certain limit while spraying is taking place. As the wind speed/direction often slows/changes in the evening. Little wonder a lot takes place late in the evening and at night.
Even in the 1970s we were utilising a tractor 20 hours a day, or more, ploughing or cultivating all day and then through the night until low on fuel. I did quite a bit, when the extra money was needed.
I would think the old saying 'make hay while the sun shines' is still true in agriculture, even it is extended to the hours of darkness.
Regards, RAB