River crossing conundrum

A man lives in a small house with a farm as his back garden and has a river beside his house. On the other side of the river is a shop. One day he visited the shop. he bought a chicken and Fox for his farm and bought a bag of corn to feed the chicken on.The man can only take one thing and himself across in the boat.

With out killing any animals or letting another animal eat an item or animal, how will the man get across?