The man sustained light wounds near his eye while working in the farmlands of Kibbutz Ein Hashlosha, after one of the bullets struck a water tank, causing shrapnel to spray.
Gunfire on the fields of Ein Hashlosha has become a regular occurrence of light, though casualties are rarely reported.
Some two months ago, a 20-year-old Ecuadorian kibbutz volunteer, Carlos Chavez, was killed when shot in the back by a Palestinian sniper.
Also on Wednesday, seven Qassam rockets hit the western Negev, two of them striking a kibbutz in Sha'ar Hanegev regional council.
One of the rockets struck directly into the yard of a house on the kibbutz. There were no injuries reported in either incident, but the rockets caused damaged to some nearby structures.
Also on Wednesday, Palestinian rescue crews have dug up the bodies of two smugglers killed in a tunnel collapse in the southern Gaza Strip.
It took rescuers six days to reach the bodies. They say a lack of equipment and a strong smell in the tunnel hampered their efforts.
Palestinians use a network of tunnels along the Egyptian border to smuggle weapons, cigarettes and other items into Gaza. The tunnels are built into the sand and sometimes collapse.