Method to reduce harvest losses by combine and to clean soiled soybean [Glycine max]
2001
Hara, Y. (Hokkaido. Central Agricultural Experiment Station, Naganuma (Japan)) | Takenaka, H. | Sekiguchi, K. | Hara, K. | Tamaki, T.
Combined harvester has not been adapted to soybean harvest because of higher rate of harvest losses and soiled bean. Recently, two types of domestic combine were developed and are used widely for soybean harvest. One of them we called 'Hanyo combine' has rotary thresher with screw fin, and can harvest 4 rows. Another one we called 'Small bean combine' is rotary thresher with curved tine, and can harvest 2 rows. Row width is 60cm or 66cm, and both combine can mount cutter bar header or row crop header. We tested a few Hanyo combines and Small bean combines at some soybean conditions. Then we propose methods to reduce harvest losses and rate of soiled soybean. To reduce header losses of Hanyo combine less than 5% under working speed 1.0m/s, height of the lowest soybean pod must be more than 12cm above ground surface and clearance from cutter bar to lowest pod have to more than 5cm. In the case of Small bean combine, pods must be higher than 10cm. The rate of soiled soybean is slight at the stem's moisture content below 40%. At the stem's moisture content over 40%, the rate of soiled soybean can be reduced by cutting bar height over 12cm. We can reduce the soiled index from point 2 to point 1 by two types of bean cleaner. So it is necessary to keep soiled index below point 2 harvested by combine.
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