Soybeans and sunflowers are two of the main crops that you can still plant in June and even July in the Dakotas and expect some pretty decent yields.
Soybeans can still be planted into mid-June in North Dakota and early July in South Dakota.
Nathan Mueller, South Dakota State University Extension agronomist, and Han Kandel, North Dakota State University Extension agronomist, offer the following advice on planting soybeans late:
•Select earlier maturing varieties. Reduce the maturity rating by 0.5 from normal as planting is delayed into mid-June (in North Dakota) and past mid-June (in South Dakota) and by as much as 1.0 if planting is delayed into early July. (in South Dakota).
•Increase seeding rates 10 to 15%.
•Solid seed or plant in narrow rows so that canopy closure occurs as quickly as possible, and to compensate for other yield components such as nodes per plant and pods per plant that can decrease when planting late.
•If you are planting soybeans on land that you had fertilized for wheat or corn, the extra nitrogen could increase the incidence of iron chlorosis deficiency. Also, if soils remain wet and cool, iron deficiency could be more of a problem. Therefore, select varieties with some IDC resistance. Soybeans will use the extra N that is available, but may not develop N-fixing nodules.