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Residual Nitrogen from NH₄NO₃ Fertilizer and from Alfalfa Plowed under¹

Synopsis: Residual N from NH₄NO₃ averaged 44% of the original application after 1 year but was insignificant after 2 years. For a 5-year period, N uptake from the alfalfa area exceeded that from virgin area by 341 pounds per acre.

² Soil Scientist, USDA, former Soil Scientist USDA (now with General Electric Co., Richland, Wash.), and Research Technician, USDA, Prosser, Wash. The authors are indebted to A. J. Mackenzie, Southwestern Irrigation Field Station, Brawley, Calif., for the various analyses concerned with the prediction of available N from soil tests.

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				R. M. Mohr, M. H. Entz, H.H. Janzen, and W. J. Bullied Plant-Available Nitrogen Supply as Affected by Method and Timing of Alfalfa Termination Agron. J., July 1, 1999; 91(4): 622 - 630. [Abstract] [Full Text] [PDF]