... /seeder(wheat,corn, soybean ), tractor(20HP--150HP), combine harvester(wheat ,corn,rice,potato), straw chopper and machine parts. Specification of JY ... -YS-4AJY-YS-4A corn combine harvester machine:1. ... returning straws to fields. 4 Rows big Corn Combine Harvester ,compact combine corn harvester,small corn harvester JY-YS-4A