Factors Affecting Methane Production in Flooded Rice Soils

2015 ◽  
pp. 157-165 ◽  
Author(s):  
Charles W. Lindau ◽  
William H. Patrick ◽  
Ron D. DeLaune
Keyword(s):  
Methane Production ◽  
Rice Soils ◽  
Factors Affecting ◽  
Flooded Rice

Increased P diffusion as an explanation of increased p availability in flooded rice soils

1976 ◽  
Vol 45 (2) ◽  
pp. 365-377 ◽  
Author(s):  
F. T. Turner ◽  
J. W. Gilliam
Keyword(s):  
P Availability ◽  
Rice Soils ◽  
Flooded Rice ◽  
P Diffusion

Analysis of environmental factors affecting methane production from high-solids organic waste

1997 ◽  
Vol 36 (6-7) ◽  
pp. 493-500 ◽  
Author(s):  
J. J. Lay ◽  
Y. Y. Li ◽  
T. Noike ◽  
J. Endo ◽  
S. Ishimoto
Keyword(s):  
Moisture Content ◽  
Methane Production ◽  
Organic Waste ◽  
High Solids ◽  
Methanogenic Activity ◽  
Factors Affecting ◽  
Bacterial System ◽  
Sludge Cake ◽  
Production Curve ◽  
Ph Range

A simple model developed from the Gompertz equation was used to describe the cumulative methane production curve in the batch culture. By using this model, three key parameters, namely methane production rate, potential and lagphase time, in a cumulative methane production curve were exactly estimated based on the experimental data. The results indicate that each gram of dry organic waste of a sludge cake, meat, carrot, rice, potato and cabbage had a methane production potential of 450, 424, 269, 214, 203 and 96 mL, respectively. The methanogenic activity of these digesters decreased with a decrease in the moisture content. The moisture content threshold limit, at which the methanogenic activity dropped to zero, was found to be 56.6% for the sludge cake, but greater than 80% for meat, carrot and cabbage. In the high-solids sludge digestion, the relative methanogenic activity dropped from 100% to 53% when the moisture content decreased from 96% to 90%. The rate of methane production at moisture contents of 90% to 96% functioned in a pH range between 6.6 and 7.8, but optimally at pH 6.8, and the process may fail if the pH was lower than 6.1 or higher than 8.3. On the other hand, the methanogenic activity was dependent on the level of ammonium, NH4+, but not free ammonia, NH3, indicating that the NH4+ was the more significant factor rather than the NH3 in affecting the methanogenic activity of a well-acclimatized bacterial system. In the wide pH range of 6.5 to 8.5, the methanogenic activity decreased with the increase in the NH4+; dropped 10% at the NH4+-N concentration of 1670-3720 mg·L−1, 50% at 4090-5550 mg·L−1 and dropped to zero at 5880-6600 mg·L−1. However, the lagphase time was dependent on the NH3 level, but not on NH4+, and when NH3-N was higher than 500 mg·L−1, a notable shock was observed. This suggests that the NH3 level was the more sensitive factor than the NH4+ level for an unacclimatized bacterial system.

Methane production and emission in surface and subsurface rice soils and their blends

2012 ◽  
Vol 158 ◽  
pp. 94-102 ◽  
Author(s):  
Sudip Mitra ◽  
Deepanjan Majumdar ◽  
Reiner Wassmann
Keyword(s):  
Methane Production ◽  
Rice Soils

Controlling the process of denitrification in flooded rice soils by using microbial fuel cell applications

2018 ◽  
Vol 206 ◽  
pp. 11-19
Author(s):  
Tharangika Ranatunga ◽  
Ken Hiramatsu ◽  
Takeo Onishi
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Rice Soils ◽  
Flooded Rice

Microbial Ecology of Flooded Rice Soils

1980 ◽  
pp. 125-168 ◽  
Author(s):  
I. Watanabe ◽  
C. Furusaka
Keyword(s):  
Microbial Ecology ◽  
Rice Soils ◽  
Flooded Rice

Flooded rice soils of Northern Australia. 1. Changes in salinity

Soil Research ◽  
1972 ◽  
Vol 10 (1) ◽  
pp. 43 ◽  
Author(s):  
BG Williams
Keyword(s):  
Soil Solution ◽  
Specific Conductivity ◽  
Northern Territory ◽  
Soil Profiles ◽  
Northern Australia ◽  
Rice Soils ◽  
Growing Period ◽  
Flooded Rice ◽  
Ion Species ◽  
Total Salinity

Soil salinity, pH, and Eh were determined in two soil types on the Adelaide River plains (Northern Territory) throughout the growing period of a rice crop. Both the total salinity, as indicated by specific conductivity values of the soil solution, and individual ion species were followed at 30 sites in each soil. The results demonstrated the existence of salt gradients within the soil profiles and these gradients, together with the total salt concentration and ion ratios, remained relatively constant throughout the growing season. The results are discussed in terms of experimental methods commonly employed for determining the effects of soil solution properties on rice culture.

Effect of Sesbania, Azolla and rice straw incorporation on the kinetics of NH4, K, Fe, Mn, Zn and P in some flooded rice soils

1989 ◽  
Vol 116 (1) ◽  
pp. 37-48 ◽  
Author(s):  
S. Nagarajah ◽  
H. U. Neue ◽  
M. C. R. Alberto
Keyword(s):  
Rice Straw ◽  
Rice Soils ◽  
Flooded Rice ◽  
Straw Incorporation ◽  
Kinetics Of
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