N 2 O emissions from humid tropical agricultural soils: effects of soil moisture, texture and nitrogen availability

Weitz, A.; Linder, Ernst; Frolking, Steve; Crill, Patrick; Keller, Michael

doi:10.1016/s0038-0717(01)00013-x

Cited by 190 publications

(108 citation statements)

References 29 publications

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“…2). Other researchers also showed greater N 2 O emissions in the first weeks after N fertilizer application, attributing this effect to increased N availability for nitrification and denitrification processes and favorable environmental conditions for N 2 O emissions such as rainfall, high soil moisture, temperature, and available C ( Jumadi et al, 2008;Linzmeier et al, 2001;Menéndez et al, 2006;Signor et al, 2013;Weitz et al, 2001;Zaman et al, 2008).…”

Section: Discussionmentioning

confidence: 90%

Enhanced-Efficiency Fertilizers in Nitrous Oxide Emissions from Urea Applied to Sugarcane

et al. 2015

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The environmental benefits of producing biofuels from sugarcane have been questioned due to greenhouse gas emissions during the biomass production stage, especially nitrous oxide (N 2 O) associated with nitrogen (N) fertilization. The objective of this work was to evaluate the use of nitrification inhibitors (NIs) dicyandiamide (DCD) and 3,4 dimethylpyrazole phosphate (DMPP) and a controlled-release fertilizer (CRF) to reduce N 2 O emissions from urea, applied at a rate of 120 kg ha -1 of N. Two field experiments in ratoon cycle sugarcane were performed in Brazil. The treatments were (i) no N (control), (ii) urea, (iii) urea+DCD, (iv) urea+DMPP, and (v) CRF. Measurements of N 2 O fluxes were performed using static chambers with four replications. The measurements were conducted three times per week during the first 3 mo and biweekly afterward for a total of 217 and 382 d in the first and second seasons, respectively. The cumulative N 2 O-N emissions in the first ratoon cycle were 1098 g ha -1 in the control treatment and 1924 g ha -1 with urea (0.7% of the total N applied). Addition of NIs to urea reduced N 2 O emissions by more than 90%, which did not differ from those of the plots without N. The CRF treatment showed N 2 O emissions no different from those of urea. The results were similar in the second ratoon: the treatment with urea showed N 2 O emissions of 0.75% of N applied N. Application of NIs resulted in a strong reduction in N 2 O emissions, but CRF increased emissions compared with urea. We therefore conclude that both NIs can be options for mitigation of greenhouse gas emission in sugarcane used for bioenergy.

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Section: Discussionmentioning

confidence: 90%

Enhanced-Efficiency Fertilizers in Nitrous Oxide Emissions from Urea Applied to Sugarcane

et al. 2015

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“…In general, the higher the soil moisture content, the more N 2 O is emitted from soils, although N 2 O may be further reduced to N 2 by denitrification when soil is completely saturated (Letey et al 1980;Weitz et al 2001). One study reported a significant correlation between soil moisture and N 2 O emissions from soybean crops between the pod-filling period and crop commercial maturity when soil moisture ranged from 24% to 78% water-filled pore space (WFPS) (Ciampitti et al 2008).…”

Section: Soil Moisturementioning

confidence: 99%

Mitigation of postharvest nitrous oxide emissions from soybean ecosystems: a review

Uchida

Akiyama

2013

Soil Science and Plant Nutrition

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In this review, the current knowledge of nitrous oxide (N 2 O) emissions from soybean (Glycine max (L.) Merr.) ecosystems, particularly on postharvest N 2 O emissions, is summarized and controlling factors of postharvest N 2 O emissions from soybean ecosystems are discussed. A new biological method to mitigate N 2 O emission is also presented. The latest (2006) guidelines of the Intergovernmental Panel on Climate Change (IPCC) concluded that N 2 O emissions derived directly from biological nitrogen (N) fixation were not significant in legume crop ecosystems. The default N 2 O emission factor from biological N fixation was revised to zero, whereas the default N 2 O emission factor for the decomposition of legume crop residues (postharvest N 2 O emissions) was the same as that for nonlegume crop residues (1%). From previously measured field data, the percentage of N in soybean residue emitted as N 2 O after harvest was calculated to determine emission factors. Values ranged from 0.0-10.0% (average 1.3% ± 2.7%, median: 0.2%), indicating relatively low emission factors. The average emission factor calculated for N 2 O emissions from N in soybean residues was slightly higher than the default emission factor for N in crop residue specified in the guidelines. However, the volume of field-measured postharvest N 2 O emissions in soybean ecosystems is low compared with data for N 2 O emissions during the crop growing season. Previous field-measured data demonstrated that N 2 O emissions often peaked sharply immediately after the harvest. However, values for N 2 O fluxes in the currently available field data were determined on a weekly or monthly basis. This large time gap between samplings may have resulted in underestimation of postharvest N 2 O emissions in soybean ecosystems. More detailed field studies on postharvest N 2 O emissions from soybean ecosystems are needed. Nodule decomposition is the major source of postharvest N 2 O emissions in soybean ecosystems. A new microbiological method was recently developed to mitigate postharvest N 2 O emissions from soybean ecosystems utilizing N-fixing bacteria with increased N 2 O-reducing activity (increased expression of nosZ). This approach may potentially be applied to other leguminous crops and non-legume ecosystems. Ongoing research on the relationships between soil N 2 O emissions and nosZ may reveal a new method for N 2 O mitigation in the future.

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“…Crop rotations are also reported to potentially affect N 2 O emissions from soils (Vilain et al 2010), as are the dates of application and levels of nitrogen fertilization inputs (Van Groenigen et al 2010). N 2 O emissions from soils are the result of complex interactions between the structure and functioning of microbial communities, as well as soil conditions affected by climatic conditions and land use (Weitz et al 2001). The variety of pedoclimatic contexts and combinations of soil agricultural practices make their impacts on N 2 O emissions difficult to study in croplands (Hénault et al 2012).…”

Section: Introductionmentioning

confidence: 99%

High N2O variations induced by agricultural practices in integrated weed management systems

Vermue

Nicolardot

Hénault

2016

Agron. Sustain. Dev.

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Integrated weed management aims to decrease the dependence of cropping systems on herbicides by using a combination of several agricultural practices. Environmental impacts of individual practices under various conditions are already known. However, there is scarce knowledge on the impact of combining several practices. Therefore, we studied N 2 O emissions of weed management cropping systems that use differing practices such as crop diversity, tillage, and herbicide pressure, during about 1 year. Data were compared with a conventionally managed cropping system. Results were also simulated using the NOE model. Results show a large variation of N 2 O emissions, ranging from 177 g N 2 O-N/ha for intensive tillage integrated weed management to 362 g N 2 O-N/ha for the conventional cropping system, 777 g N2O-N/ha for the no herbicide cropping system and 5226 g N 2 O-N/ha for no-till integrated weed management. Most N 2 O emissions occurred in spring, despite the absence of fertilizing related N 2 O peaks. The lowest emissions occurred in autumn and winter. Emissions are explained by interactions between specific soil potential denitrification rate, soil bulk density, temperature, soil water, and inorganic N contents. N 2 O emissions are accurately predicted by the model NOE, with a global Nash-Sutcliffe coefficient of efficiency equal to 0.80.

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N 2 O emissions from humid tropical agricultural soils: effects of soil moisture, texture and nitrogen availability

Cited by 190 publications

References 29 publications

Enhanced-Efficiency Fertilizers in Nitrous Oxide Emissions from Urea Applied to Sugarcane

Enhanced-Efficiency Fertilizers in Nitrous Oxide Emissions from Urea Applied to Sugarcane

Mitigation of postharvest nitrous oxide emissions from soybean ecosystems: a review

High N2O variations induced by agricultural practices in integrated weed management systems

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