If the Crops are planted up to the feild edges You probably need to set up a few stands close to the edge's and do a salt block and mineral lick just behind the stands.Most plants won't grow in too much shade ..at first You may get something to grow with the leaves off the tree's but as they start sprouting and leaves get very thick and cover up the ground most plants won't survive...unless You happen to hit an opening area or road that gets a little more sunlight?If its late Fall and the Farmer harvest his crops and nothing is left but bare ground and some corn or soybean stubbles You could broadcast some winter wheat and it would take off thru the winter and into spring?