Document Type

Article

Publication Date

8-2020

Keywords

Rice production, Arkansas, Greenhouse gas emissions

Abstract

Water management regimes influence greenhouse gas emissions in rice (Oryza sativa L.) production. The objective of this study was to quantify methane (CH4 ), nitrous oxide (N2 O), and carbon dioxide (CO2 ) under direct-seeded conditions in the greenhouse to evaluate the effects of water regime on fluxes and growing-season-long emissions. Research was conducted during 2019 using a hybrid rice cultivar (RT 7311 CL) grown in a DeWitt silt loam (Albaqualf). Six plastic tubs, filled with 21 kg of soil and manually seeded, were arranged in a completely random design with two replications of three water regime treatments: i) flooded, ii) saturated, but not flooded and, iii) moist soil (i.e., slightly below saturation). In each tub, a 30-cm-diameter base collar was installed to a depth of 12 cm. Soil volumetric water content in the tubs was recorded daily, while above ground and root dry matter (DM) were collected at the end of the season. Methane, N2 O, and CO2 fluxes differed among water regimes over time (P < 0.05). Season-long CH4 and CO2 emissions differed among water regimes (P < 0.05) and were three and two times larger from the flooded-soil condition than from the moist-soil and nearly saturated conditions, respectively, while season-long N2 O emissions were unaffected by water regime. Aboveground DM was more than two times greater (P < 0.05) from the flooded-soil than from the non-flooded treatments. Root DM was unaffected by water regime. Characterizing the effects of soil moisture content could improve the understanding of the dynamics that regulate production of greenhouse gases in rice production systems.

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

Download

Share

COinS