Monday, November 5, 2007
102-6

Evaluation of N Rates and Starter Fertilizer Placement Methods for Strip-till Corn in Eastern Kansas.

Keith Janssen, 2149 Montana Road, Kansas State University - Plant Pathology, Kansas State University, E Central Field, Ottawa, KS 66067

Corn producers in eastern Kansas are wanting to know if they can reduce traditional N rates when using an under the row strip-till banded fertilization system. Also they are wanting to know if there is any yield advantage from applying P-K-N starter fertilizers beside the seed row in a strip-till fertilization system. Rates of N compared were 60, 80, 100, 120, 140, and 160 lb N/a. The P-K-N starter fertilizer placement methods evaluated were all of the P-K-N starter fertilizer applied five inches below the row during the strip-till operation, all of the P-K-N starter fertilizer placed 2.5 x 2.5 inches from the seed row at planting, and a combination of half of the P-K-N starter fertilizer applied in the strip-till zone and half at planting. The 80 lb/a N rate maximized corn grain yields. The placement of the P-K-N starter fertilizer beside the seed row at planting increased early-season corn growth compared to the application of all of the P-K-N starter in the strip-till zone. The increased early-season growth with planter-banded fertilizer, however, did not increase yields. Highest grain yields were produced when all of the P-K-N starter fertilizer was included in the strip-till zone.