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Fate and Transport of Nitrogen Applied to Six Warm-Season Turfgrasses

Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695

View larger version (26K): [in a new window]   Fig. 1. Nitrate-N concentration in the leachate from six warm season turfgrasses following the first application (23 Oct.) of ammonium nitrate. Values are means of four samples.

View larger version (25K): [in a new window]   Fig. 2. Ammonium-N concentration in the leachate from six warm season turfgrasses following the first application (23 Oct.) of ammonium nitrate. Values are means of four samples.

View larger version (25K): [in a new window]   Fig. 3. Nitrate-N concentration in the leachate from six warm season turfgrasses following the second application (22 Nov.) of ammonium nitrate. Values are means of four samples.

View larger version (19K): [in a new window]   Fig. 4. Nitrate-N concentration in the leachate from six warm season turfgrasses following the third application (21 Mar.) of ammonium nitrate. Values are means of four samples.

View larger version (18K): [in a new window]   Fig. 5. Example of cumulative N harvest data analysis for estimating long term N use efficiency. Data are presented for centipedegrass and St. Augustinegrass, representing the least and most efficient species, respectively.

View larger version (30K): [in a new window]   Fig. 6. Concentration of reduced N in the clippings from six warm season turfgrasses during the final 6 mo of the study. Arrows indicate NH4NO3 applications (50 kg N ha-1). Values are means of four samples.

View larger version (20K): [in a new window]   Fig. 7. Nitrate leaching loss as a function of root length density. Leaching losses are averaged across the final three N application periods, and root length densities are averaged across the 30- to 55-cm soil depth.