The fields around us have a wide variety of stuff growing on them. Right next to our house we have wheat and oats. Further away there are various grasses for hey and barley and rye. Slowly but surely, everything is ripening and the fields are changing from green to a golden yellow.
In some time, the farmers will start harvesting the years growth and then our dogs can recapture the fields as their romping and training grounds.
To enhance this change, the b+w conversion emphasized the difference between the greens and yellow/oranges of the shot.