Normally corn is harvested with a self-propelled combine harvester equipped with maize header. Harvester pick cobs when dried and shell corn from cob, clean grain and fill it in the inbuilt storage tank, from where it is moved on to a trailer with an auger. Harvester are very expensive and meant for large scale commercial operation. Secondly, harvesters can not pick green corn for the table market.
Corn Picker, can pick corn dried or in green form and fill it in the bucket mounted behind the tractor. This machine can pick cobs from three rows planted between 26 to 32 inch (66 to 82 CM) row spacing, simultaneously.