Total denitrification and the ratio between N2O and N2 during the growth of spring barley
Total denitrification (N2O+N2) and nitrous oxide emission were measured on intact soil cores using the acetylene inhibition technique.
Total denitrification from the depth 0–8 cm during the growth period from April to August was 7 kg N/ha from plots supplied with 30 kg N/ha and 19 kg N/ha from plots supplied with 120 kg N/ha. The amounts of precipitation, plant growth, and N application were found to affect the denitrification rate. These factors also affected the ratio (N2O+N2)/N2O, which varied from 1.0 to 7.2. Plant growth and precipitation increased the proportion of N2 produced, whereas a high nitrate content increased the proportion of N2O.
Key wordsBarley Denitrification Hordeum vulgare N2 N2O
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