The tracks you see here are those of a tractor equipped with pesticide sprinklers or chemical fertilizers, according to the period of the year.
Today, an official report issued in France about ground and river waters quality warns that 3/4 of these VITAL ressources are polluted by chemicals and pesticides.
I don't want to start an argument here, but I just think it's a nonsense to overproduct in rich countries, if the price to pay is that expensive.
This photo was taken about 3 weeks before harvesting. Beginning of July, the top is already yellow, while the rest of the plant is still green, giving this color duality. Autocontrast, plus some softening with NeatImage.