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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820 EISSN: 0718-5820
Vol. 72, No. 1, 2012, pp. 133-139
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Bioline Code: cj12021
Full paper language: English
Document type: Research Article
Document available free of charge
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Chilean Journal of Agricultural Research, Vol. 72, No. 1, 2012, pp. 133-139
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EFFECT OF NITROGEN INHIBITORS ON NITROUS OXIDE EMISSIONS AND PASTURE GROWTH AFTER AN AUTUMN APPLICATION IN VOLCANIC SOIL
Vistoso, Erika; Alfaro, Marta; Saggar, Surinder & Salazar, Francisco
Abstract
A range of technologies is available to reduce greenhouse gas emissions from agricultural systems. Among these, applying
N transformation inhibitors is promising in reducing nitrous oxide (N2O) emissions in both arable and pastoral soils. A
randomized complete block design with six replicates was used to quantify the effect of urease (UI) and nitrification (NI)
inhibitors on N2O emissions and pasture production from permanent pasture in an Andisol after autumn-applied urea. The
N2O emissions were measured periodically for 8 wk with PVC stationary chambers. Mineral N, DM yield, N concentration,
and N uptake were analyzed. Our results show that adding fertilizer (40 kg N ha-1) significantly increased N2O emissions
by 281% over the control treatment (P < 0.05) and adding N inhibitors to fertilizer N resulted in a 10%-29% reduction
in emissions. Both inhibitors initially reduced nitrate-N production in the Andisol (Osorno series) either by slowing urea
hydrolysis or the nitrification process. Increases in pasture yield (8%-13%), N concentration (7%-9%), and N uptake (46%-
56%) were measured by adding N inhibitors with urea. Emission factors, measured under field conditions in Chile after
autumn- applied urea and N inhibitors (applied alone or combined), were very low (0.052%-0.114%) compared with values
reported in the literature and the Intergovernmental Panel on Climate Change (IPCC) default value (1%). Using these
technologies could contribute to Chile's nationally established goal of a 20% reduction in greenhouse gas emissions by
2020.
Keywords
Andisol, emission factor, urease inhibitor, nitrification inhibitor, urea
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