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.com
Volume 2
Environment Pollution and Climate Change
ISSN: 2573-458X
Climate Change 2018 &
Global ENVITOX 2018
October 04-06, 2018
October 04-06, 2018
London, UK
16
th
Annual Meeting on
Environmental Toxicology and Biological Systems
&
5
th
World Conference on
Climate Change
JOINT EVENT
CO
2
emissions, organic carbon and nitrogen under conventional tillage in an arid region, Northwest
of Mexico
Silvia M Avilés
1
, Roberto Soto
1
, Isabel Escobosa
1
, Víctor A Cárdenas
1
, S M Cristina Ruíz
1
, Eduardo Salcedo
2
and
Jairo Díaz
3
1
Autonomous University of Baja California, Mexico
2
University of Guadalajara, Mexico
3
University of California, USA
C
onventional tillage systems in the production of agricultural crops often use excessive application of nitrogen fertilizer,
which is a source of generation of greenhouse gases (N
2
O and CO
2
). The information regarding the assessment of
greenhouse gases emissions in conventional tillage a system, which is most widely used in the Mexicali Valley, is limited. The
aim of this study was to evaluate the CO
2
emission, organic carbon and soil nitrogen related to the application of nitrogen
fertilizer in a soil cultivated with wheat under conventional tillage in the Mexicali Valley, Baja California. The experimental
plot, with a soil AquicHaplotorrert was cultivated with wheat (
Triticum durum
), with applications of doses of nitrogen fertilizer
(0, 200 and 400 kg ha-1). Organic carbon was measured by Walkley & Black method. Soil samples were incubated under 65%
of field capacity at a temperature of 30°C. CO
2
emanated from the treatments was measured after 4, 22, 46 and 142 hours
of incubation. Nitrogen mineralization (NO
3
-) was obtained from KCl extraction and Kjeldahl method. The tendency was
described by a lineal function (y = ax + b) and a statistical means trial test was carried out (Tukey a=0.05). Organic carbon
values were between 0.87 to 1.02%; no difference was found at different doses. The emission of CO2 was 194, 247 and 238
mg/g/h for doses 0, 200 and 400 Kg N ha-1, respectively, and there was not significantly difference (p>0.05) (Table 1). The
magnitude of the nitrogen mineralization was 753, 942 and 1125 mg N for doses 0, 200 and 400 Kg N ha-1, respectively, with
differences (p>0.05) between them (Table 2). Highest doses of nitrogen applied to the soil does not necessarily correspond
to a higher emission of CO
2
or organic carbon, but increase (p<0.05) the nitrogen mineralization, at least under evaluated
conditions.
monica_aviles@uabc.edu.mxEnviron Pollut Climate Change 2018, Volume 2
DOI: 10.4172/2573-458X-C1-003