You can pull at least five secrets to increasing soybean yields from 2015 North Dakota soybean production survey.

The study, which involved about 200 soybean fields, says that highest yields in 2015 came from:

1.  Planting before mid-May.

2.  Seeding 155,000 to 165,000 seeds per acre.

3.  Using 15- to 22-inch rows. Soybeans in 30-inch rows had the lowest yields.

4.  Treating seed. Eighty percent of the farmers in the survey used seed treatments and they averaged 36.4 bushels per acre. Twenty percent did not use seed treatments and they averaged of 35.0 bushels per acre.

Soybeans planted before mid-May last year had the highest yield.

5.  Selecting chlorosis resistant varieties for fields with iron deficiency chlorosis. About 69% of the growers indicated that they did not have iron deficiency symptoms in their fields and had an average yield of 37.5 bushels per acre. Approximately 31% of the growers indicated that they had some iron deficiency chlorosis in their fields and on average these fields yielded 34.4 bushels per acre.

Click here to see more data from the survey.