The combine should be adjusted so that the seeds are completely threshed while using the lowest possible cylinder speed. Careful adjustment of the cylinder speed and cylinder opening is important to avoid cracking. When the crop is very dry, every other cylinder bar may have to be removed. To test for cracking, run your hand into the threshed seed. If cracked mustard is present, it will adhere to the hair on the back of your hand, indicating the need for further combine adjustment.
Cracked seed is considered dockage and a loss to the producer.
Cylinder speed may need to be varied during the day as crop moisture content varies. Fan speed should be reduced to limit seed loss with the straw, yet maintain sufficient air to ensure a clean sample. F. Yield Average yield are in the 800 to 1200 pound range, with a value of 9 to 13 cents per pound. I have seen yellow mustard reach as high as 35 cents per pound, so definately is a finicky specialty crop. Current value is around 10 cents per pound.