Abstract:
:It is imperative for sustainable agriculture to explore practices and inputs creating low N2O emission capacity without reducing the productivity of the agricultural system. To evaluate different nutrient management schemes, a microcosm study was conducted to assess the direct N2O emission from soil. Four different treatments were used to provide a preliminary assessment of N2O emissions, as well as the concentrations of nitrates (NO3-) and ammonium (NH4+) produced in soil: compost (derived from green plant residues), chickpea residues (green manure) in two different N concentrations (2.6% and 5.5%, respectively) and ammonium nitrate (fertilizer). The soil was thoroughly mixed with the organic amendments and ammonium nitrate and incubated for 31 days. The emissions of N2O were higher in green manure with high-N content, as a source of nitrogen in the soil, and were similar to the emissions measured from the chemically fertilized soil. In particular, chickpea residues, with high-N content, exhibited cumulative N2O emissions, equal to 266.17 μg N/m2, whereas in fertilized soil the emissions were 267.10 μg N/m2. On the contrary, the incorporation of chickpea plant residues with low-N content can be an efficient way to minimize the N2O emissions at 21.63 μg N/m2. The emissions of N2O when compost was applied, remained relatively low, equal to 5.47 μg N/m2, and in comparison to soil without any treatment. Overall, a positive association between NH4+, NO3- in soil and N2O emissions were observed. However, this response was treatment depended, and the significant positive correlation between NH4+ and N2O emissions were noticed in soils treated with ammonium nitrate, chickpea residues with low N content, as well as untreated controls. On the contrary, the positive correlation observed between NO3- and N2O emissions in soils receiving compost and high N chickpea residues, suggest that the different treatments are differentially affecting the processes that are contributing to N2O emissions in agricultural soils. These findings, emphasize that the different nutrient management schemes are differentially affecting the main process contributing to N2O emissions in agricultural soils.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Christodoulou E,Agapiou A,Anastopoulos I,Omirou M,Ioannides IMdoi
10.1016/j.jenvman.2019.04.115subject
Has Abstractpub_date
2019-08-01 00:00:00pages
168-176eissn
0301-4797issn
1095-8630pii
S0301-4797(19)30582-1journal_volume
243pub_type
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