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Agronomic Crops Network

Ohio State University Extension


Combine Adjustments for 2015 Soybean Harvest

Kaylee Port was also a contributor to this article

2015 represents another unique cropping year due to the wet weather conditions during spring planting and persistence through July.  The result has been many fields with highly variable soybeans conditions with a few containing short soybeans.  The variable crop conditions translate into variable harvesting conditions in terms of moisture and height.  Therefore, proper setup and pre-season maintenance along with correct adjustments during combine operation will be important for the 2015 soybean harvest to minimize loss and bean damage. 

Proper combine settings and attention to detail during soybean harvest reduces harvest losses.   Short soybeans are especially difficult to feed into the header and through the combine.  Short beans are difficult to convey into the header because they are often podded lower to the ground which increases the risk of loss.

A few simple combine adjustments can help to prevent grain damage and harvest loss.  Two areas of focus for combine operators in 2015 should be ground speed and combine header settings to keep crop loss to a minimum.  As a combine operator, material fed incorrectly into the header significantly impacts grain quality and loss.  Consider, two important points:

-          4 soybean seeds per square foot equates to a 1-bu/ac loss.  Acceptable harvest loss is 3% or less (approx. 1-2 bu/ac) in soybeans but improperly adjusted combines or an operator not paying attention to details can generate errors of 10% or higher, and

-          80% of harvest loss occurs at the header.

2015 is a year that operators need to focus on details and changing of soybean conditions. Checking harvest loss will be important to keep the combine adjusted properly, especially in short and variable soybeans. Total harvest loss can occur in three areas: 1) pre-harvest soybeans, 2) header and 3) combine. One should check these three areas within different locations in a field.  Checking behind the combine represents total harvest loss but one must check pre-harvest loss before combining an area as well as just in front of the header (header loss).  Combine loss equals the total harvest loss minus the pre-harvest loss.  Checking all three areas determines if and what combine settings must be adjusted, especially header loss. 

One of the first items for the season is to review the owner’s manual and/or consult your local combine dealer for help on proper combine settings specific to the crop and harvest conditions.  The following provides a few suggestions on adjustments and operation factors in variable and short soybeans:

• A floating, flexible cutterbar and automatic header height control can improve the ability to maintain the header low and level to the ground during harvest.

• Take time and slow the combine down.  Slowing up 0.5 to 1.0 mph in areas where harvest loss might be risky. 

• Keep the cutter bar as low as possible for short soybeans and those that are dry.  This point is important in areas with low plant populations and where more pods are on the lower portion of the plant, nearest the ground.

• Shorter soybeans require smaller clearances between the reel, cutter bar, auger and the feed conveyor chain, to ensure stems are feeding through the platform and into the feeder house.

• Check knives, guards, ledger plates and wear plates.  Keep spares handy in 2015.  

• Ensure the sickle is sharp. Dull sickles tend to push stems over rather than cut them cleanly.

• Make sure to properly adjust guards and header to proper engagement angle as outlined in the operator’s manual.

• Check that stems are being cleanly cut across the header.  If not, check for dull blades, improperly set header angle, other incorrect header settings, or reduce your ground speed.

• Keep an eye on reel speed and adjust to match soybean conditions and ground speed within the field.  The rule of thumb is to keep reel speed ~25% faster than ground speed. 

• Make sure the feeder house relative to the header is at the proper adjustment to keep material feed as efficient as possible.

• Importantly, make sure chains and bearings are properly lubricated and serviced on their stated time intervals.  Belts should be tight and checked routinely.

Crop Observation and Recommendation Network

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.