Increases in nitrogen use efficiency decrease nitrous oxide emissions but can penalize yield in sugarcane

• Autores: Chalco Vera, Jorge; Portocarrero, Rocío; Piñeiro, Gervasio; Acreche, Martín
• Año de publicación: 2022
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Nutrient Cycling in Agroecosystems; Vol.122, no.1; 41-57; http://www.springer.com/
• Materia: GREENHOUSE GASES; N FERTILIZATION; N2O EMISSION INTENSITY; NITROGEN UPTAKE EFFICIENCY
• Institución: Universidad de Buenos Aires. Facultad de Agronomía

Fil: Chalco Vera, Jorge. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Salta (EEA Cerrillos). Cerrrillos, Salta, Argentina.
Fil: Chalco Vera, Jorge. CONICET. Buenos Aires, Argentina.
Fil: Portocarrero, Rocío. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Famaillá (EEA Famaillá). Famaillá, Tucumán, Argentina.
Fil: Portocarrero, Rocío. Universidad Nacional de Tucumán. Facultad de Agronomía y Zootecnia. Tucumán, Argentina.
Fil: Piñeiro, Gervasio. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Piñeiro, Gervasio. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Acreche, Martín. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Salta (EEA Cerrillos). Cerrillos, Salta, Argentina.
Fil: Acreche, Martín. CONICET. Buenos Aires, Argentina.
Nitrogen (N) fertilization strategies focused on increasing nitrogen use efficiency (NUE) and decreasing nitrous oxide (N2O) emissions are important for sustainable crop production. In sugarcane, however, a joint assessment of NUE, N2O emissions and yield is still required. We aimed to establish, in a subtropical sugarcane cropping system, if variations in NUE (by decreasing rates or changing formulations of N fertilization) allow decreasing N2O emissions and, to what extent, yield is penalized. Four fertilization treatments were used: without fertilizer, with low and high urea fertilization (55 and 110 kg N ha-1) and with ammonium nitrate fertilization (110 kg N ha-1). There was a significant negative relationship between N2O emissions and NUE. At high N rates (110 kgN ha-1) ammonium nitrate produced 37% higher cumulative N2O emissions and 13 and 12% lower NUE and cane yield, respectively, than urea. The highest N2O emissions of the ammonium nitrate treatment occurred within 48 hs after N fertilization and were mainly associated with the direct addition of nitrate (NO3-–N). Results showed that, for the environmental conditions of Tucuman (Argentina), NUE above 160 kg of cane per kg of N available in soil penalized cane yield, whereas NUE below 140 kg of cane per kg of N available in soil penalized N2O emission abatement.
grafs.