Previous Crop and Cultivar Effects on Methane Emissions from Drill-Seeded, Delayed-Flood Rice Grown on a Clay Soil

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Abstract

Due to anaerobic conditions that develop in soils under flooded-rice (Oryza sativa L.) production, along with the global extent of rice production, it is estimated that rice cultivation is responsible for 11% of global anthropogenic methane (CH4) emissions. In order to adequately estimate CH4 emissions, it is important to include data representing the range of environmental, climatic, and cultural factors occurring in rice production, particularly from Arkansas, the leading rice-producing state in the US, and from clay soils. The objective of this study was to determine the effects of previous crop (i.e., rice or soybean (Glycine max L.)) and cultivar (i.e., Cheniere (pure-line, semidwarf), CLXL745 (hybrid), and Taggart (pure-line, standard-stature)) on CH4 fluxes and emissions from rice grown on a Sharkey clay (very-fine, smectitic, thermic Chromic Epiaquerts) in eastern Arkansas. Rice following rice as a previous crop generally had greater (p < 0.01) fluxes than rice following soybean, resulting in growing season emissions (p < 0.01) of 19.6 and 7.0 kg CH4-C ha-1, respectively. The resulting emissions from CLXL745 (10.2 kg CH4-C ha-1) were less (p = 0.03) than those from Cheniere or Taggart (15.5 and 14.2 kg CH4-C ha-1, resp.), which did not differ. Results of this study indicate that common Arkansas practices, such as growing rice in rotation with soybean and planting hybrid cultivars, may result in reduced CH4 emissions relative to continuous rice rotations and pure-line cultivars, respectively.

Figures

  • Table 1: Mean soil properties (𝑁 = 12 for each previous crop) prior to flood establishment from Sharkey clay during the 2013 growing season at the University of Arkansas Northeast Research and Extension Center in Keiser, Arkansas.
  • Figure 2: Methane fluxes over time throughout the flooded portion of the 2013 growing season from CLXL745, Cheniere, and Taggart averaged across previous crop treatment at the Northeast Research and Extension Center in Keiser, Arkansas. The vertical dashed lines represent panicle differentiation (PD) and 50% heading (HDG) dates for CLXL745, Cheniere, and Taggart at 54, 58, and 61 days after flooding, respectively. Flood release occurred in 83 days after flooding. Least significant difference for the same cultivar = 0.241mgCH 4 -Cm−2 hr−1 and for different cultivars = 0.307mgCH 4 -Cm−2 hr−1. Error bars indicate standard errors for the treatment means (𝑁 = 8).
  • Table 2: Analysis of variance summary of the effects of previous crop, cultivar, time, and their interaction on methane (CH 4 ) fluxes fromflooding to flood release and following flood release from a clay soil during the 2013 growing season at the Northeast Research and Extension Center in Keiser, Arkansas.
  • Figure 1: Methane fluxes over time throughout the flooded portion of the 2013 growing season from previous crop treatments averaged across cultivar at the Northeast Research and Extension Center in Keiser, Arkansas. The vertical dashed lines represent panicle differentiation (PD) and 50% heading (HDG) dates for CLXL745, Cheniere, and Taggart at 54, 58, and 61 days after flooding, respectively. Flood release occurred in 83 days after flooding. Least significant difference for the same previous crop treatment = 0.197mgCH 4 -Cm−2 hr−1 and for different previous crop treatment = 0.309mgCH 4 -Cm−2 hr−1. Error bars indicate standard errors for the treatment means (𝑁 = 12).
  • Figure 3: Soil oxidation-reduction potential (Eh) at the 7.5 cmdepth over the flooded portion of the 2013 growing season for CLXL745 and Cheniere at the Northeast Research and Extension Center in Keiser, Arkansas.
  • Figure 4: Daily mean soil temperature at the 7.5 cm depth over the flooded portion of the 2013 growing season for rice and soybean previous crop treatments at the Northeast Research and Extension Center in Keiser, Arkansas.
  • Table 3: Mean aboveground dry matter and yields collected at harvest (24 October, 2013) from Cheniere, CLXL745, and Taggart following previous crops of rice and soybean at the Northeast Research and Extension Center in Keiser, Arkansas.
  • Table 4: Summary of the effect of previous crop, cultivar, and their interaction on seasonal methane (CH 4 ) emissions from a clay soil during the 2013 growing season at the Northeast Research and Extension Center in Keiser, Arkansas.

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CITATION STYLE

APA

Smartt, A. D., Brye, K. R., Rogers, C. W., Norman, R. J., Gbur, E. E., Hardke, J. T., & Roberts, T. L. (2016). Previous Crop and Cultivar Effects on Methane Emissions from Drill-Seeded, Delayed-Flood Rice Grown on a Clay Soil. Applied and Environmental Soil Science, 2016. https://doi.org/10.1155/2016/9542361

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