96-14 Effect of Nitrification Inhibitor on Ammonia and Nitrous Oxide Emissions and Nitrogen Use Efficiency in Intensive Vegetable Production Systems.
See more from this Division: ASA Section: Environmental QualitySee more from this Session: Greenhouse Gas Emissions from Agriculture: I
Objectives of this study are, to quantify NH3 and N2O emissions from manures applied to a celery crop, the effect of nitrification inhibitor (DMPP) on these losses emission and on productivity and N use efficiency.
Total N application rate is 451 kg N/ha, with chicken manure of 255 kg N/ha and the rest of calcium nitrate) over two celery fields (4ha each). DMPP (0.4% per unit NH4+-N) was applied immediately following manure application to one field. NH3 and N2O emissions were measured measured by Open Path Fourier-Transform Infrared (OP-FTIR) spectroscopy technique-backward Lagrangian stochastic (bLS) dispersion model (WindtTax).
20 kg N/ha lost over 6 days as NH3, accounting for 7.8% of applied manure N. The application of DMPP reduced N2O losses by 64% but Increased NH3 loss by 20%, with no impact on biomass yield. Nitrogen use efficacy in the plant was very low, <8%, indicating that major improvements could be made in N management in vegetable systems, particularly in manure management which provides a large component of the N.
See more from this Session: Greenhouse Gas Emissions from Agriculture: I