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CO2 Emissions, Organic Carbon And Nitrogen Under Conventional Tillage In An Arid Region, Northwest Of Mexico | 96920
ISSN: 2573-458X
Environment Pollution and Climate Change
Open Access
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Conventional tillage systems in the production of agricultural crops often use excessive application of nitrogen fertilizer,
which is a source of generation of greenhouse gases (N2O and CO2). 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 CO2 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. CO2 emanated from the treatments was measured after 4, 22, 46 and 142 hours
of incubation. Nitrogen mineralization (NO3-) 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 CO2 or organic carbon, but increase (p<0.05) the nitrogen mineralization, at least under evaluated
conditions.