Effect of Tillage, Rotation (maize and soybean), and Nitrogen Rate in a Long Term Study on Solvita, Water Extract, H3A Extract Values.

A long tillage/rotation/N rate study was established in 1985 on a mostly Coleridge silty clay loam (fine-loamy, mixed, superactive, mesic Cumulic Haplustoll). The study is a factorial of plow, disk, and no-till under continuous corn (Zea mays) and corn following soybeans (Glycine Max) with five nitrogen rates (0 to 160 kg/ha). Soil samples were taken from all rotation/tillage combinations and three N rates in the fall of 2013 to 0.20 m. They were analyzed using the Haney and Solvita soil tests at Ward Laboratory. The results of these analysis will be presented.