Managing Global Resources for a Secure Future

2017 Annual Meeting | Oct. 22-25 | Tampa, FL

108701 Flooded Fallow and Rice Effects on Histosol Organic Matter and Fertility.

Poster Number 519

See more from this Division: SSSA Division: Soil and Water Management and Conservation
See more from this Session: Managing Soils and Crops with Cover Crops Poster

Wednesday, October 25, 2017
Tampa Convention Center, East Exhibit Hall

Timothy Lang1, Jennifer Cooper1 and Samira H. Daroub2, (1)Soil and Water Science, University of Florida, Belle Glade, FL
(2)3200 E Palm Beach Rd. Univ. of FL, University of Florida, Belle Glade, FL
Abstract:
Flooded fallow and rice fields both have the potential to substantially reduce the oxidation of soil organic matter (soil carbon), and its loss to the atmosphere as CO2. However, prolonged flooding of a soil has the potential to produce methane (CH4), a reduced carbon gas with a higher global warming potential than CO2 (an equivalent amount of CH4 will warm the globe 31 times more than CO2). However, because rice plants transport oxygen to their roots where it may leach out into the soil, flooded rice is expected to produce significantly less CH4 than flooded fallows due to an increase in soil redox potential. Measurements of soil carbon gas flux (CO2 and CH4) under flooded rice production, a direct measure of soil subsidence, have not been published from Histosols in south Florida. Additionally another important soil gas is nitrous oxide (N2O). Nitrous oxide has a greater ability to warm the atmosphere than either CO2 or CH4, with a global warming potential 298 times that of CO2. In general, highly organic soils have a greater potential to absorb N2O than mineral soils due to their high carbon content. This project which is being conducted in lysimeters will identify the most effective water management technique that minimizes soil greenhouse gas emmisions and if planted with rice, still produces optimum rice yields.

See more from this Division: SSSA Division: Soil and Water Management and Conservation
See more from this Session: Managing Soils and Crops with Cover Crops Poster

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