Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 January 1973
Published in Agron J 65:53-55 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Source and Rate of Nitrogen on N Uptake and Fertilizer Efficiency by Spring Wheat and Barley1

J. Alessi and J. F. Power2

Field experiment was conducted to determine the effect of fertilizer N source and rate on N uptake and recovery by small grains. Five N sources — NH4NO3, (NH4)2SO4 Ca(NO3)2, Uramite, and Nitroform (urea-formaldehyde) — were applied to Temvik silt loam for 4 years at rates of O, 34, and 68 kg N/ha to spring wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) under an annual dryland cropping system. Residual responses were measured until effects were no longer significant. N content of plants was usually increased at all stages of growth by all N sources; N uptake was greatest for the ammonium and nitrate sources at the 68-kg rate. At the end of the residual period, recoveries averaged 78% for the ammonium anl nitrate sources, and 44% for the urea-formaldehyde materials. Recoveries increased by 12 to 29% during the residual period, with the greatest increase occurring for the calcium nitrate treatment. Highest average N recovery for the 8-year period was 87% for Ca(NO3)2. No accumulation of NO3-N remained in the upper 180 cm of soil at the end of the experiment.

Results from this long-term study indicate that ammonium and nitrate sources of fertilizer N are superior to urea-formaldehyde for small grain production in semiarid regions.

Key Words: Slow-release N-fertilizers • N absorption by small grains • N recovery

1 Contribution from the Northern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA.

2 Soil Scientists, USDA, Mandan, N.D.

Received for publication April 21, 1972.




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Copyright © 1973 by the American Society of Agronomy.