期刊
AGRICULTURE-BASEL
卷 11, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/agriculture11121298
关键词
high-yielding variety; lime nitrogen; litter bag method; methane; nitrous oxide; shallow plowing
类别
The study found that autumn plowing promotes rice straw decomposition and suppresses CH4 emissions, while the application of lime nitrogen does not have a significant impact. The high soil pH at the site may have contributed to the limited alkaline effect of lime nitrogen.
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.
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