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- Title
Slurry <sup>15</sup>NH<sub>4</sub>-N recovery in herbage and soil: effects of application method and timing.
- Authors
Hoekstra, Nyncke J.; Lalor, Stan T. J.; Richards, Karl G.; O'Hea, Norma; Lanigan, Gary J.; Dyckmans, Jens; Schulte, Rogier P. O.; Schmidt, Olaf
- Abstract
The effects of slurry application method and weather conditions after application on ammonia volatilisation are well documented, however, the effect on slurry N recovery in herbage is less evident due to large variability of results. The objective of this field experiment was to determine the recovery of cattle slurry NH4-N in herbage and soil in the year of application as affected by application method (trailing shoe versus broadcast) and season of application (spring versus summer), using 15N as a tracer. In 2007 and 2008, 15N enriched slurry was applied on grassland plots. N recovery in herbage and soil during the year of application was determined. Both spring and trailing shoe application resulted in significantly higher herbage DM yields, N uptake and an increased recovery of 15NH4-N in herbage. Additionally, the recovery of slurry 15NH4-N in the soil at the end of the growing season was increased. Spring and trailing shoe application reduced the losses of slurry 15NH4-N by on average 14 and 18 percentage points, respectively, which corresponded closely to ammonia volatilisation as predicted by the ALFAM model. It was concluded that slurry N recovery in temperate pasture systems can be increased by adjusting the slurry application method or timing.
- Subjects
SLURRY; WEATHER; AMMONIA; NITROGEN compounds; SOIL management; GRASSES; NITROGEN in agriculture
- Publication
Plant & Soil, 2010, Vol 330, Issue 1/2, p357
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-009-0210-z