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Angie Peltier

Angie Peltier
Former Extension Educator, Commercial Agriculture

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Hill and Furrow

Current topics about crop production in Western Illinois, including field crops research at the NWIARDC in Monmouth.
Figure. Brian Mansfield, NWIARDC Research Agronomist,  programming the combine computer to collect yield,  moisture, and test weight data.
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Combine comparisons

Posted by Angie Peltier - Equipment

At the NWIARDC, yield, grain moisture, and test weights are measured and data is recorded in a precise manner using well calibrated equipment on a small-plot combine. We use a plot-combine manufactured by Kincaid, a company out of Kansas. This plot combine is a smaller version of a full-sized combine but with more 'bells and whistles' (Figure).

Compared with a full-sized combine, features of the small-plot combine (including the grain tank and corn and soybean harvest capacity) are smaller, and harvest and shelling speed are slower (Table).

There are two seats in the cab, one for the operator and one that faces backwards towards a tube for collecting grain samples (Figure). There is also a small hand-held computer that allows you to upload plot maps for ease of data collection (Figure). This computer also then records the yield, grain moisture and test weight data from each plot. As a back-up, next to the computer there is a printer that records all data collected from each plot onto a roll of paper.

Table. Comparing features of small-plot and full-sized combines.


Small-plot combine

Full-sized combine


2 rows

up to 18 rows


6.6 ft wide (two 30" or five 15" rows)

up to 40 ft wide

Grain tank capacity

48 bu

may be over 300 bu

Harvest speed

approximately 0.5 mph (in plots)

approximately 4-5 mph

Shelling speed

approximately 20 bu/hr

approximately 2,000 bu/hour


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