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Effect of Fertilizers, Age of Stand, and Decomposition on Weight of Grass Roots and of Grass and Alfalfa on Soil Nitrogen and Carbon¹

Synopsis: Nitrogen fertilizer increased root weights of three species of grass. Phosphorus increased root weights at the higher rate, while potassium had no effect. Increase in root yield was greatest the first 3 or 4 years after seeding. From 75 to 95% of the roots in the surface 6 inches had decomposed 2 years after plowing. Changes in soil nitrogen and carbon content during a 5-year period after seeding to grass and alfalfa and after plowing the sod were small.

² Soil Scientist, Western Soil and Water Management Research Branch, Soil and Water Conservation Research Division, A.R.S., U.S.D.A., Northern Great Plains Field Station, Mandan, N. Dak. The author wishes to express his appreciation for the helpful assistance rendered by George A. Rogler and John C. Thysell.