In the wheat field: it means, in the harvest place.
I saw many small green snakes on the ground: green snakes, common non-poisonous snakes in China. Many green snakes mean a lot of trouble. Moral: A lot of small troubles.
Interpretation of dreams: On the way to harvest, there are many annoying little troubles. You don't want to solve them, but you want to get there quickly and don't want them to cause you trouble.