PSXII-17 The Effects of N Fertilization on N2O Emissions from Urine or Fecal Samples from Nellore Bulls

Abstract Better understanding of N2O emissions from interactions between urine or feces, with different levels nitrogen (N) fertilization on tropical pastures would be helpful in developing strategies to mitigate and improve inventories. The objective this study was evaluate feces samples collected Nellore young bulls, isolated association N fertilizer. Study designed as completely randomized block design five replications per treatment. Treatments were two excreta (Feces Urine) three fertilizer (0, 75 150 kg ha-1). Ammonium nitrate used source (32% N). One liter 1.5 chamber the respective dose directly applied sample. Gas evaluated using static closed method quantified gas chromatography. Chambers for 40 min at 0, 20 min. After treatment imposition, sampled times during week 1, twice 2, 3, 4 once 5, 6, 7 8, subsequently every 2 weeks consecutive years. Type did not affect emissions. Additionally, associative effects onto similar. Cumulative linearly increased increasing regardless source, ranged 5.95, 32.1 74.7 mg N2O/m2, kg/ha/year N. Similarly, factor (0.15, 0.36 0.73%, excreta, + Therefore, interaction additive.