Comparative Performance of Nitrogen Sources on Smooth Bromegrass and Tall Fescue1
- R. E. Lamond,
- L. S. Murphy,
- C. W. Swallow and
- K. W. Kelley2
Studies were initiated in 1973 at two locations in eastern Kansas to evaluate the performance of five N carriers as sources of N for bromegrass (Bromus inermis L.) and tall fescue (Festuca arundinacea Schred.). Late winter applications of ammonium nitrate, urea, urea-ammonium nitrate solution (UAN), sulfur-coated urea (SCU), and urea-ammonium sulfate (UAS) were compared at rates of 67, 134, and 201 kg N/ha.
Excellent visual responses to applied N were evident in both years. Total yields of forage generally increased with N applications up to 201 kg N/ha. The response to N decreased as the rate was raised from 134 to 201 kg N/ha. Maximum economic return from the application of N occurred at a level of about 134 kg N/ha. No clear-cut superiority was established for any N carrier. Sulfur-coated urea performed well on tall fescue but less effectively on bromegrass. Although there was evidence of delayed release of N from SCU, its efficiency as measured by total yield was similar to conventional N sources. The effectiveness of a carrier was influenced by location, environmental conditions, and grass species.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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