For soils where soybeans have not been successfully grown within three years, an inoculant containing nitrogen-fixing bacteria should be applied at planting. Check the expiration date to assure viability at planting. Store inoculant in a cool, dry place prior to planting. Do not mix inoculant and fungicide treatments far in advance of planting. Apply inoculant at rates and in the manner according to manufacturer.
Many producers use small amounts of nitrogen fertilizer for soybeans.
While there appears to be no yield advantage under most conditions to this practice, an early season growth response may be observed. In some cases, this could permit more efficient use of early season directed herbicide applications. Nitrogen in excess of 20 pounds per acre can seriously inhibit the symbiotic nitrogen-fixation process. The phosphate and potash recommendations for soybeans are based on the soil test levels as shown in the Fertilizer Recommendations for Soybeans table. Fertilization without a soil test is an unsound agronomic practice.