Evolution and soil entrapment of nitrogen gases formed by denitrification in flooded soil
| Autor: | Roland J. Buresh, M. I. Samson, Surajit K. De Datta |
|---|---|
| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Soil Science and Plant Nutrition. 36:299-307 |
| ISSN: | 1747-0765 0038-0768 |
| DOI: | 10.1080/00380768.1990.10414996 |
| Popis: | The direct field measurement of N loss by denitrification in flooded soils has been a long-standing challenge. A field experiment was conducted in puddled, flooded soil without plants to ascertain whether the directly measured evolution of (N2 + N2O)-15N from 15N-labeled nitrate applied to floodwater was an accurate measure of denitrification loss. The evolution of (N2 + N2O)-15N was determined from the 15N content of air samples collected in a chamber placed over the floodwater. The evolved (N2 + N2O)-15N increased for 2 to 3 days following addition of either 3.5, 6.9, or 10.4 kg nitrate-N-ha-1 and then decreased on succeeding days. Evolved (N2 + N2O)-15N correlated (r = 0.86) with floodwater (NO3 - + NO2 -)-N measured 48 h earlier. The total (N2 + N2O)-15N evolved over the 10 days following nitrate addition ranged from 20 to 25% of the added N. The added 15N not recovered in the soil and floodwater after 10 days ranged from 48 to 64% of the added N. This unrecovered 15N presumably represented d... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|