3,4-Dimethylpyrazole Phosphate (DMPP) Reduces N<sub>2</sub>O Emissions from a Tilled Grassland in the Bogotá Savanna
2019
Ximena Huérfano | Sergio Menéndez | Matha-Marina Bolaños-Benavides | Carmen González-Murua | José-María Estavillo
Grasslands are subject to a wide range of land management practices that influence the exchange of the three main agricultural greenhouse gases (GHGs) that are related to agriculture: carbon dioxide (CO<sub>2</sub>), nitrous oxide (N<sub>2</sub>O), and methane (CH<sub>4</sub>). Improving nitrogen fertilization management practices through the use of nitrification inhibitors (NIs) can reduce GHGs emissions. We conducted a field experiment at the Colombian Agricultural Research Corporation with four fertilization treatments: urea (typical fertilizer used in this region), ammonium sulfate nitrate (ASN), ASN plus the NI 3,4-dimethylpyrazole phosphate (ASN+DMPP), and an unfertilized control. The highest grassland yields (1956 and 2057 kg DM ha<sup>−1</sup>, respectively) and apparent fertilizer nitrogen recoveries (34% and 33%, respectively) were generated by the conventional urea fertilizer and ASN+DMPP. Furthermore, the use of ASN+DMPP reduced the N<sub>2</sub>O emissions that were related to N fertilization to the level of the unfertilized treatment (ca. 1.5 g N<sub>2</sub>O-N ha<sup>−1</sup>), with a significant reduction of N-yield-scaled N<sub>2</sub>O emissions (ca. 20 g N<sub>2</sub>O-N kg N uptake<sup>−1</sup>). These results support the application of DMPP as an alternative strategy to increase grassland yield while simultaneously reducing the environmental impact of N fertilization.
显示更多 [+] 显示较少 [-]