To estimate soybean yield losses from seed that has fallen on the ground:
- Select several random areas of the field
- Use a hoop or other device of known size to delineate an area and count the number of seeds in that have fallen to the ground in that area
- After counting the seeds that have fallen, use the following formula to calculate the yield loss:
A 3' diameter hoop was used to determine soybean losses after a hailstorm (Image 2). An average of 220 seeds were counted inside the hoop:
((220 seeds/3000 seeds per pound)/60 lbs. per bu)/((3.14 x 1.5' x 1.5')/43,560 sq. ft per acre) = ~7.5 bushel per acre yield los
Image 2. 3' Diameter Hula Hoop
This will determine your pre-harvest losses. Any losses from the harvesting operation will be in addition to this.