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Corn is one of the most widely grown crops in the world, and harvesting it efficiently is essential for food, feed, and fuel production. Many people ask what machine harvests corn, and the answer depends on whether the corn is destined for grain or silage. This article explains the primary harvesting equipment for corn, with special attention to the combine harvester and its operation. It also covers how does a combine harvester work when processing corn, since the machine operates differently with corn than with small grains. Shijiazhuang Tianren Agricultural Machinery Equipment Co Ltd supports the agricultural sector with reliable components for various harvesting machines.
For grain production, the combine harvester is the machine that harvests corn. However, a standard grain header will not work for corn. Corn stalks are thick, woody, and spaced in rows. To handle this crop, the combine is fitted with a corn head, also called a corn header or maize header. This header has row units that match the row spacing of the corn field, typically 70 to 80 centimeters.
Each row unit has two counter rotating gathering chains that pull the stalk into the header. Below the chains, snapping rolls grab the stalk and pull it downward. This action snaps the ear off the stalk. The ear then moves into a cross auger or conveyor that feeds it into the combine throat. The stalk remains standing or is pushed to the ground, depending on the header design.
Once the ears enter the combine, the same threshing and cleaning principles apply as for other grains. The threshing cylinder and concave separate the kernels from the cob. Corn requires more aggressive threshing than wheat because the kernels are tightly attached. The cylinder speed is usually set higher, and the concave clearance may be tighter.
The cob, which is heavier than straw, moves through the straw walkers or rotor and exits the rear. The kernels and some chaff fall through the concave and go to the cleaning system. The fan and sieves remove cob fragments, dust, and other debris, leaving clean corn kernels in the grain tank.
A key difference for corn is the optional kernel processor. Some combines have a device that cracks each kernel to improve digestion for livestock feed. This is especially useful when corn is harvested at higher moisture for high moisture corn storage.
Corn harvest requires attention to moisture content. Grain corn is typically harvested at 15 to 20 percent moisture. Higher moisture corn must be dried after harvest, which adds cost. Lower moisture corn may suffer from kernel cracking during threshing.
The combine settings for corn are different from those for soybeans or wheat. The cylinder speed is higher, but the concave clearance is often wider to allow the larger cob to pass through. The fan speed is moderate because cob fragments are heavier than chaff but lighter than kernels.
Ground speed for corn is typically lower than for wheat because the header must handle the heavy stalk material. The operator should also watch for ear loss at the header. Loose ears can fall to the ground if the gathering chains and snapping rolls are not adjusted properly.
When the question what machine harvests corn is asked in the context of silage, the answer changes. Corn silage is made by chopping the entire plant into small pieces, which are then fermented in a silo or bunker. The machine for this job is a forage harvester with a maize header. This header has heavy duty cutter knives that chop stalks, leaves, and ears together. The resulting material is 8 to 15 millimeters long and contains both grain and plant fiber.
Some forage harvesters also include a kernel processor to break the grain and improve starch availability. This is particularly important for dairy rations.
Q1 What machine harvests corn for grain in large fields?
A combine harvester with a corn header is the standard machine for grain corn. It cuts, threshes, cleans, and stores the grain in one pass.
Q2 What machine harvests corn for silage?
A forage harvester with a maize cutter header is used for silage. This machine chops the entire plant, including stalks and ears.
Q3 How does a combine harvester work when harvesting corn differently from wheat?
The combine uses a corn header to snap ears from stalks. The threshing mechanism runs at higher speed and with wider concave clearance to handle the larger cob and kernel structure.
Q4 Can the same combine harvest both corn and soybeans?
Yes, if the combine can accept both a corn header and a grain platform header. The operator must change the header and adjust settings like cylinder speed and sieve openings.
Q5 What machine harvests corn if I want to keep the stalks for bedding?
A combine harvester leaves stalks standing or lays them on the ground. If stalks are needed for bedding, a separate baler can collect them after harvest. A forage harvester destroys the stalk structure for silage.
Q6 How does a combine harvester work with wet corn?
Wet corn requires careful adjustment. The operator may need to reduce ground speed and increase cylinder speed. The cleaning system must handle the heavier, wetter material. Drying after harvest is often necessary.
The answer to what machine harvests corn depends on the end use. For grain, the combine harvester with a corn header is the most efficient and widely used machine. Understanding how does a combine harvester work for corn helps operators set the machine correctly for high quality grain with low loss. For silage, a forage harvester with a maize header is the correct choice. Companies like Shijiazhuang Tianren Agricultural Machinery Equipment Co Ltd provide components that keep these machines operating reliably. By matching the machine to the crop and the goal, farmers can achieve better harvest results and reduce costs.