期刊名称：Revista Internacional de Contaminación Ambiental
印刷版ISSN：0188-4999
出版年度：2010
卷号：21
期号：1
页码：23-29
语种：Spanish
出版社：Centro de Ciencias de la Atmósfera
摘要：The use of chemical and organic nitrogen fertilizers and its relationship to environmental contamination implies the necessity of implementing alternatives that may reduce nitrogen losses from soil and hence increase nitrogen use efficiency by crops. Fertiirrigation is a technique of water and fertilizers application that improves fertilizers use efficiency. There are no reports on fertirrigation effects on nitrous oxide (N 2 O) emissions or denitrification. The objective of the present work was to study the effect of fertirrigation and conventional fertilization on denitrification and verify if fertirrigation can reduce N 2 O emissions to the atmosphere. N 2 O was trapped in situ by the method adapted by Grageda (1999) and Vivanco (2000). The samples of N 2 O were taken at 2, 24, 48, and 72 h after irrigation. Soil temperature was taken with a regular thermometer approximately at 10 cm of soil depth. Soil water (012 cm) was monitored by using a DT Delta T device, type ML2 ThetaProbe. N 2 O quantification was carried out by gas chromatography. Statistical analysis and figures were developed using the SAS software (SAS 1998). The figures and results obtained demonstrated that soil water strongly affected N 2 O emission since there were significant differences at 2, 24, 48, and 72 h after irrigation compared to conventional fertilization and irrigation. In spite of the fact that differences between systems were not significant, N 2 O emission for fertirrigation was 0.69 and 2.82 for conventional fertilization at 48 and 72 h. The temperature registered along crop growing season were lower than optimum temperature for denitrification, and it is believed that low temperature decreases denitrification. Soil pH ranged from 8.0 to 8.4, which is significantly higher than optimum for denitrificacion and this may affect negatively N 2 O emissions in conventional and fertirrigation nitrogen fertilization.
