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Nitrogen Changes in Cultivated Dryland Soils¹

Sypnosis: Nitrogen losses from cultivated soils were most rapid immediately after breaking the native sod. Losses gradually decreased with continued cultivation in experiments from 1916 to 1946. Row crop production caused the largest losses of nitrogen. Small grain production caused the smallest losses. Under small grains, nitrogen losses had ceased by 1938. Elsewhere losses continued through 1946. Straw and manure applications reduced nitrogen losses. Earlier and more intensive tillage caused greater losses of soil nitrogen than later and less intensive cultivation.

² Associate Agronomist, Kansas State College, and Soil Scientist, ARS, formerly located at Hays, Kansas now at Bozeman, Montana, respectively.

Received for publication November 30, 1956.