| Autor: |
Lunga, D. Della, Brye, K. R., Slayden, J. M., Lebeau, S. G., Roberts, T. L., Norman, R. J. |
| Předmět: |
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| Zdroj: |
B.R. Wells Rice Research Studies - Arkansas Agricultural Experiment Station, University of Arkansas System; Aug2020, Issue 667, p191-194, 4p |
| Abstrakt: |
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 (N2O), 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 soil and manually seeded, were arranged in a completely random design in the greenhouse with two replications of three water regime treatments: i) flooded, ii) saturated, but not flooded, and iii) moist soil (i.e., slightly below saturation). On 13 different dates, gas sampling occurred. Methane, N2O, and CO2 fluxes differed among water regimes over time (P < 0.05). End-of-season aboveground rice dry matter differed among water regimes (P < 0.05). Aboveground dry matter was more than two times greater from the flooded-soil than from the non-flooded treatments. Root dry matter was unaffected by water regime due to large measured variability. Season-long CH4 and CO2 emissions differed among water regimes (P < 0.05) and were larger from the flooded-soil condition than from the moist-soil and nearly saturated conditions, while season-long N2O emissions were 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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