Resumo

CIAMPITTI, Ignacio A; CIARLO, Esteban A  e  CONTI, Marta E. Nitrous oxide emission during a soybean [Glycine max (L.) Merril] culture: inoculation and nitrogen fertilization effects. Cienc. suelo [online]. 2005, vol.23, n.2, pp.123-131. ISSN 1850-2067.

Nitrous oxide gas absorbs infrared radiation contributing to the greenhouse effect; this gas is produced mainly in soil, by means of the processes of nitrification and denitrification. In a field study at the FAUBA on a typic Argiudol, we evaluated the effect of fertilization and inoculation with Bradyrhizobium japonicum during a soybean culture [Glycine max (L.) Merrill], on nitrous oxide emisión. Gases were sampled with PVC cylinders and were read with gaseous chromatography. Emissions presented increasing values from seeding towards physiological maturity for all treatments; this behavior was similar to the evolution presented by nitrate level and soil moisture. Nitrogen fertilization significantly increased (P<0.05) nitrous oxide emissions and inoculation only had a significant effect with the highest level of fertilization (P=0.09). Plots fertilized at highest dose and inoculated gave the greatest nitrous oxide emissions. The variable that better explains the emissions is the nitrate level (r² = 0.1899; P=0.0231).

Palavras-chave : Denitrification; Nitrification; Nitrogen.

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