Effects of organic matter, moisture content and other environmental factors on denitrification in topsoils of an upland field

Takashi Nishio, Tetsuo Kanamori, Takao Fujimoto, Tetsuo Kanamori

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Effects of various environmental factors on the denitrification process in topsoils of an upland field were investigated. Denitrification was estimated from the evolution of N2O in the presence of C2H2. The N2O evolution from the soils under anaerobic conditions was markedly stimulated by the addition of glucose, but only slightly by that of nitrate. The denitrification in the soils was apparently limited by the supply of organic matter which can serve as effective electron donor. Denitrification hardly occurred when the soils with a moisture content less than 60% of the maximum water-holding capacity were exposed to the air. However, denitrification did occur after a time lag of 3 to 4 days at 12°C, 1 to 2 days at 20°C, and 0.5 day at 30°C, when the soils were water-logged. The denitrification capacity in a field cropped with maize was higher than that in an un-cropped field, the highest capacity being found in summer in the cropped field. This finding may result from the development of the maize rhizosphere where denitrification process is active. Experimental evidence supporting this assumption was presented.

Original languageEnglish
Pages (from-to)97-105
Number of pages9
JournalSoil Science and Plant Nutrition
Volume34
Issue number1
DOIs
Publication statusPublished - 1988 Mar

Keywords

  • Denitrification
  • Environmental factors
  • Fertilizer
  • Rhizosphere

ASJC Scopus subject areas

  • Soil Science
  • Plant Science

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