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Mowing and Nitrogen Source Effects on Ammonia Volatilization from Turfgrass

Agronomy and Soils Dep. Auburn Univ., 201 Funchess Hall, Auburn, AL 36849

View larger version (21K): [in this window] [in a new window]   Figure 1. Diagram of complete laboratory set up with jars, pump, and air scrubbers, following the procedure of O'Halloran (1993). The glass manifold is connected to an opening in each jar with silicon tubing.

View larger version (15K): [in this window] [in a new window]   Figure 2. Effect of mowing (M) and N source on percent N volatilized in Exp. 1. Mean comparisons are only within each fertilizer (mowed or unmowed), and not across N sources. There was no significant difference in NH3 volatilization due to mowing. AN, ammonium nitrate; SCU, S-coated urea.

View larger version (15K): [in this window] [in a new window]   Figure 3. Ammonia volatilization as affected by N source and sampling day, Exp. 1. Vertical bars are the standard error. AN, ammonium nitrate; SCU, S-coated urea.

View larger version (16K): [in this window] [in a new window]   Figure 4. Ammonia volatilization as affected by N source and sampling day, Exp. 2. Vertical bars are the standard error. AN, ammonium nitrate; SCU, S-coated urea.

View larger version (11K): [in this window] [in a new window]   Figure 5. Total cumulative N loss due to NH3 volatilization over a 10-d period as affected by N source, Exp. 1. Columns with different letters are significantly different from each other at = 0.05. AN, ammonium nitrate; SCU, S-coated urea.

View larger version (9K): [in this window] [in a new window]   Figure 6. Total cumulative N loss due to NH3 volatilization over a 10-d period as affected by N source, Exp. 2. Columns with different letters are significantly different from each other at = 0.05. AN, ammonium nitrate; SCU, S-coated urea.