The interdependence of ammonia volatilization and denitrification as nitrogen loss processes in flooded rice fields in the Philippines

1990 ◽  
Vol 9 (1) ◽  
pp. 31-36 ◽  
Author(s):  
J. R. Freney ◽  
A. C. F. Trevitt ◽  
S. K. De Datta ◽  
W. N. Obcemea ◽  
J. G. Real
Keyword(s):  
Ammonia Volatilization ◽  
Nitrogen Loss ◽  
The Philippines ◽  
Rice Fields ◽  
Flooded Rice

Processes of nitrogen loss from fertilizers applied to flooded rice fields on a calcareous soil in north-central China

1988 ◽  
Vol 18 (2) ◽  
pp. 101-115 ◽  
Author(s):  
Z. L. Zhu ◽  
G. X. Cai ◽  
J. R. Simpson ◽  
S. L. Zhang ◽  
D. L. Chen ◽  
...  
Keyword(s):  
Calcareous Soil ◽  
Nitrogen Loss ◽  
Rice Fields ◽  
Central China ◽  
North Central ◽  
Flooded Rice

Use of surface films to reduce ammonia volatilization from flooded rice fields

1988 ◽  
Vol 39 (2) ◽  
pp. 177 ◽  
Author(s):  
GX Cai ◽  
JR Freney ◽  
E Humphreys ◽  
OT Denmead ◽  
M Samson ◽  
...  
Keyword(s):  
Ammonia Volatilization ◽  
Nitrogen Loss ◽  
Surface Film ◽  
Cetyl Alcohol ◽  
Ammonia Emission ◽  
Surface Films ◽  
Flooded Rice ◽  
Strong Winds ◽  
Long Chain Alcohol ◽  
Long Chain

This paper presents the results of experiments on the control of ammonia volatilization from flooded rice by the use of surface films of organic compounds.Preliminary experiments in evaporation pans, 1.2 m diameter, buried in an upland field of mown pasture, showed that ammonia volatilization from water could be reduced by applications of surface films of long chain alcohols; the effect increased with increasing length of carbon chain.The most effective way to add the film was to dissolve the long chain alcohol in ethanol, and to distribute the solution on the surface of the water.In an experiment in a flooded rice field, additions of cetyl alcohol dissolved in ethanol significantly reduced the rate of ammonia emission and total nitrogen loss. The effect was short-lived, probably due to microbiological decomposition of the cetyl alcohol and dispersion of the surface film by strong winds.

Ammonia and nitrous oxide losses following applications of ammonium sulfate to flooded rice

1981 ◽  
Vol 32 (1) ◽  
pp. 37 ◽  
Author(s):  
JR Freney ◽  
OT Denmead ◽  
I Watanabe ◽  
ET Craswell
Keyword(s):  
Nitrous Oxide ◽  
Ammonium Sulfate ◽  
Ammonia Volatilization ◽  
The Philippines ◽  
Diurnal Variations ◽  
Flooded Soil ◽  
Chamber System ◽  
Wet Season ◽  
Flooded Rice ◽  
Initiation Stage

Ammonia volatilization from applications of ammonium sulfate to a wet season crop of flooded rice in the Philippines was measured directly by a micrometeorological technique. Prior to transplanting the rice, ammonium sulfate (80 kg nitrogen ha-1) was broadcast over the flooded soil and incorporated by harrowing. A further 40 kg nitrogen ha-1 was broadcast at the panicle initiation stage. The soil pH was 6.7, while the pH of the floodwater varied from 7 . 5 to 9.5 during the course of the experiment. Loss of ammonia was detected immediately after application of ammonium sulfate and continued for approximately 7 days. Ammonia volatilization rates were highest in the middle of the day and declined each evening following the diurnal variations in water temperature and wind speed. More ammonia was lost from the fertilizer applied at the panicle initiation stage (10.6%) than from the pre-planting application (5.1 %). The overall measured loss of ammonia was small and amounted to approximately 7 % of the total nitrogen applied to the crop. Nitrous oxide losses, measured with a chamber system, amounted to only 0.1 % of the nitrogen applied as ammonium sulfate.

Reduction of Ammonia Volatilization from Urea by a Floating Duckweed in Flooded Rice Fields

2009 ◽  
Vol 73 (6) ◽  
pp. 1890-1895 ◽  
Author(s):  
Hua Li ◽  
Xinqiang Liang ◽  
Yanfeng Lian ◽  
Lei Xu ◽  
Yingxu Chen
Keyword(s):  
Ammonia Volatilization ◽  
Rice Fields ◽  
Flooded Rice

Influence of climate variability on seasonal and interannual variations of ecosystem CO2 exchange in flooded and non-flooded rice fields in the Philippines

2012 ◽  
Vol 134 ◽  
pp. 80-94 ◽  
Author(s):  
Ma. Carmelita R. Alberto ◽  
Takashi Hirano ◽  
Akira Miyata ◽  
Reiner Wassmann ◽  
Arvind Kumar ◽  
...  
Keyword(s):  
Climate Variability ◽  
Co2 Exchange ◽  
The Philippines ◽  
Rice Fields ◽  
Interannual Variations ◽  
Flooded Rice ◽  
Seasonal And Interannual Variations

Estimating Ammonia Volatilization From Flooded Rice Fields by Simplified Techniques

1985 ◽  
Vol 49 (4) ◽  
pp. 1049-1054 ◽  
Author(s):  
J. R. Freney ◽  
R. Leuning ◽  
J. R. Simpson ◽  
O. T. Denmead ◽  
W. A. Muirhead
Keyword(s):  
Ammonia Volatilization ◽  
Rice Fields ◽  
Flooded Rice

Methane emission from flooded rice fields under irrigated conditions

1994 ◽  
Vol 18 (3) ◽  
pp. 245-248 ◽  
Author(s):  
T. K. Adhya ◽  
Amarendra K. Rath ◽  
P. K. Gupta ◽  
V. R. Rao ◽  
S. N. Das ◽  
...  
Keyword(s):  
Methane Emission ◽  
Rice Fields ◽  
Flooded Rice
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