Effects of the Autumn Incorporation of Rice Straw and Application of Lime Nitrogen on Methane and Nitrous Oxide Emissions and Rice Growth of a High-Yielding Paddy Field in a Cool-Temperate Region in Japan

The effects of autumn plowing and lime nitrogen application on rice straw decomposition, CH4 and N2O emission and rice growth in the following year in a high-yielding rice cultivated paddy field were evaluated for two years. The experimental plots were set up, combining different times of rice straw...

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Bibliographic Details
Published in:Agriculture (Basel) 2021-12, Vol.11 (12), p.1298
Main Authors: Takakai, Fumiaki, Goto, Mimori, Watanabe, Haruki, Hatakeyama, Keiko, Yasuda, Kentaro, Sato, Takashi, Kaneta, Yoshihiro
Format: Article
Language:English
Subjects:
Autumn
Crop yield
Cultivars
Cultivation
Decomposition
Emission
Emissions
Experiments
Fruits
Grain cultivation
high-yielding variety
Lime
lime nitrogen
litter bag method
Methane
Nitrogen
Nitrous oxide
Plowing
Rain
Rice
Rice fields
Rice straw
Ripening
shallow plowing
Soil chemistry
Soil lime
Soil pH
Soils
Straw
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Summary:The effects of autumn plowing and lime nitrogen application on rice straw decomposition, CH4 and N2O emission and rice growth in the following year in a high-yielding rice cultivated paddy field were evaluated for two years. The experimental plots were set up, combining different times of rice straw (750 g m−2) incorporation into the soil by plowing (autumn or the following spring), with and without lime nitrogen application in autumn (5 g-N m−2). Autumn plowing promoted the decomposition of rice straw, but the application of lime nitrogen did not show a consistent trend. The soil pH was high (7.3) at the studied site, and the alkaline effect of lime nitrogen may not have been significant. As with straw decomposition, CH4 emissions were suppressed by autumn plowing, and no effect from the lime nitrogen application was observed. It was also suggested that the straw decomposition period may be shorter and the CH4 emissions may be higher in high-yielding cultivars that require a longer ripening period than in normal cultivars. The effect of both treatments on N2O emission was not clear. Both the autumn plowing of rice straw and lime nitrogen application were effective in promoting rice growth and increasing rice yield.
ISSN:2077-0472
2077-0472
DOI:10.3390/agriculture11121298