Losses of NO and N2O emissions from Venezuelan and other worldwide tropical N-fertilized soils
Article first published online: 29 JUL 2013
©2013. American Geophysical Union. All Rights Reserved.
Journal of Geophysical Research: Biogeosciences
Volume 118, Issue 3, pages 1094–1104, 3rd Quarter 2013
How to Cite
2013), Losses of NO and N2O emissions from Venezuelan and other worldwide tropical N-fertilized soils, J. Geophys. Res. Biogeosci., 118, 1094–1104, doi:10.1002/jgrg.20081., , , , and (
- Issue published online: 10 OCT 2013
- Article first published online: 29 JUL 2013
- Accepted manuscript online: 10 JUN 2013 04:19PM EST
- Manuscript Accepted: 1 JUN 2013
- Manuscript Revised: 30 MAY 2013
- Manuscript Received: 25 JAN 2013
- nitrogen losses;
- land management
 N fertilization significantly increases N2O and NO soil fluxes to the atmosphere. In spite of the expansion of agricultural activities in tropical managed soils from the developing world, there is little information about the loss of applied nitrogen (LAN) as NO and N2O from these areas. In this work, we determined LAN-N2O and LAN-NO from different crops during the growing season at a sandy soil experimental field and two active farms with loamy and clay soils, respectively. Tillage (T) and no-tillage (NT) farming were separately evaluated. All of the evaluated areas were located in the Venezuela savanna region. A large range of LAN-N2O (0.30–6.1%) and LAN-NO (0.26–2.1%) were recorded, with overall average values of 1.9% and 0.9%, respectively. LAN values were mainly affected by soil texture and rainfall pattern, which affected soil moisture and water-filled pore space. Also, soil management (T and NT) and the chemical composition of the N fertilizer played important roles. The overall average of LAN-N2O is about two times higher than the IPCC default value of 1%; therefore, our results suggest that a higher factor should be considered for cropping systems in tropical savanna regions.