Interactive effects of ammonium application rates and temperature on nitrous oxide emission from tropical agricultural soil

Van Ngoc Tuong Hoang, Morihiro Maeda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Emissions of nitrous oxide (N2O), a potent greenhouse gas, from agricultural soil have been recognized to be affected by nitrogen (N) application and temperature. Most of the previous studies were carried out to determine effects of temperature on N2O emissions at a fixed N application rate or those of N application rates at a specific temperature. Knowledge about the effects of different ammonium (NH4 +) application rates and temperatures on N2O emissions from tropical agricultural soil and their interactions is limited. Five grams of air-dried sandy loam soil, collected in Central Vietnam, were adjusted to 0, 400, 800 and 1200 mg NH4-N kg–1 soil (abbreviated as 0 N, 400 N, 800 N and 1200 N, respectively) at 60% water holding capacity were aerobically incubated at 20°C, 25°C, 30°C or 35°C for 28 days. Mineral N contents and N2O emission rates were determined on days 1, 3, 5, 7, 14, 21 and 28. Cumulative N2O emissions for 28 days increased with increasing NH4 + application rates from 0 to 800 mg N kg–1 and then declined to 1200 mg N kg–1. Cumulative N2O emissions increased in the order of 35°C, 20°C, 30°C and 25°C. This lowest emission at 35°C occurred because N2O production was derived only from autotrophic nitrification while other N2O production processes, e.g., nitrifier denitrification and coupled nitrification-denitrification occurred at lower temperatures. More specifically, cumulative N2O emissions peaked at 800 N and 25°C, and the lowest emissions occurred at 1200 N and 35°C. In conclusion, N2O emissions were not exponentially correlated with NH4 + application rates or temperatures. Higher NH4 + application rates at higher temperatures suppressed N2O emissions.

Original languageEnglish
JournalSoil Science and Plant Nutrition
DOIs
Publication statusAccepted/In press - Jan 1 2018

Keywords

  • Agricultural soil
  • high ammonium
  • interactive effects
  • nitrous oxide
  • temperature dependence

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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