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Nitrogen Changes Attending Various Crop Rotations on Clarion-Webster Soils in Iowa¹

Sypnosis: Nitrogen declines with cultivation of Clarion-Webster soil were largest under a cropping system of continuous corn followed in the order of decreasing decline by the 2-year rotation of corn and oats, the 5-year rotation with 2 years of meadow and the 3-year rotation with 1 year of meadow. Plots with high initial nitrogen lost more nitrogen and a larger percentage of total nitrogen than plots with low initial nitrogen.

² Professor, Associate Professor and Assistant Professor of Soils, Agronomy Department, respectively.

Received for publication January 10, 1956.