CH4 and N2O Emissions in a Rice Field

First Measurements in the Uruguayan Productive System

Authors

  • Pilar Irisarri Departamento de Biología Vegetal. Facultad de Agronomía. Universidad de la República. Garzón 809, CP 12900. Sayago. Montevideo, Uruguay.
  • Virginia Pereyra Laboratorio de Ecología Microbiana y Ambiental. Facultad de Química. Universidad de la República. Avenida General Flores 2124, 11800 Montevideo, Uruguay
  • Ana Fernández Laboratorio de Ecología Microbiana y Ambiental. Facultad de Química. Universidad de la República. Avenida General Flores 2124, 11800 Montevideo, Uruguay
  • José Terra Instituto Nacional de Investigación Agropecuaria, Treinta y Tres, Uruguay.
  • Silvana Tarlera Laboratorio de Ecología Microbiana y Ambiental. Facultad de Química. Universidad de la República. Avenida General Flores 2124, 11800 Montevideo, Uruguay

DOI:

https://doi.org/10.31285/AGRO.17.533

Keywords:

rice paddy soil, greenhouse gases, N fertilization

Abstract

Irrigated rice fields are major sources of two important greenhouse gases (GHG), methane and nitrous oxide. As an initial step towards obtaining local information, emissions of CH4 and N2O from rice paddy soil were measured by the static chamber technique in greenhouse and field experiments conducted in eastern Uruguay. In the greenhouse experiment, the effect of two flooding moments (21 and 45 days after emergence) and nitrogen fertilization (0 and 50 kg N ha-1) on gas emissions was studied. Early flooding and nitrogen fertilization tended to increase N2O emissions. In the field experiment, effect of winter soil cover crop and nitrogen fertilization (0 and 82 kg N ha-1) were tested. Higher CH4 fluxes were observed mainly during the reproductive stage of the plant in the N-fertilized treatment with ryegrass winter crop. N2O flux peaked at flushing. Results indicate that the use of cover crops might increase GHG emissions during the rice cycle. Despite differences in agronomic management practices employed in Uruguay, CH4 and N2O fluxes are within magnitudes previously reported for rice fields worldwide.

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Published

2021-02-05

How to Cite

1.
Irisarri P, Pereyra V, Fernández A, Terra J, Tarlera S. CH4 and N2O Emissions in a Rice Field: First Measurements in the Uruguayan Productive System. Agrocienc Urug [Internet]. 2021 Feb. 5 [cited 2023 Feb. 1];16(2):1-10. Available from: https://agrocienciauruguay.uy/index.php/agrociencia/article/view/533

Issue

Section

Plant Biology