Emissions of Nitrous Oxide, Ammonia, and Carbon Dioxide from a Cambisol at Two Contrasting Soil Water Regimes and Urea Granular Sizes
| Autor: | Mohammad I. Khalil, Reinhold Gutser, Urs Schmidhalter |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Communications in Soil Science and Plant Analysis. 40:1191-1213 |
| ISSN: | 1532-2416 0010-3624 |
| DOI: | 10.1080/00103620902754549 |
| Popis: | The superiority of mixing and deep placement of prilled urea (PU) or urea supergranules (USG) over surface‐broadcast application for reducing nitrogen (N) loss from lowland rice is well established. In upland agricultural systems, rainfall and/or the application and loss of irrigation water from soil systems may regulate urea N transformations and gaseous losses, depending on the method of fertilizer application and the particle size. To develop further insights into these processes, experiments were carried out in a silt loam soil mixed with PU or amended with point‐placed USG at a depth of 7.5 cm. Two soil water regimes were used: around field capacity (AFC) with low evaporative conditions (depletion: 77 to 69% water‐filled pore space, WFPS) and below field capacity (BFC) with high evaporative conditions following two irrigations (depletion: 70 to 55% WFPS). The nitrous oxide (N2O) emission was greater at AFC than at BFC, where nitrification was more rapid. The N2O peaks appeared mostly after the disapp... |
| Databáze: | OpenAIRE |
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