Rice straw and winter green manure incorporations are two common practices to improve soil fertility and increase grain yields in rice farming systems in South China. However, they may also enhance CH4 emissions from the paddy fields due to carbon inputs. This experiment was designed to investigate the effects of rice straw and winter green manure additions on grain yields and methane emissions of paddy fields with double-season rice in South China. Compared to zero-straw treatment, incorporating whole rice straw significantly enhanced both dry matter production and spikelets per panicle, and thus the yield of rice grains by 4.8%. Meanwhile, straw incorporation significantly stimulated CH4 emissions, which was 41.8% higher than in zero-straw treatments. Applying winter green manure significantly increased grain yield by 3.6%, but did not significantly affect CH4 emissions, compared to the no green manure control. There were no significant interactions between straw incorporation and green manure. Our results suggest that winter green manure would be a promising practice for low-carbon emission and high-yield rice production in South China.
Journal of Agro-Environment Science( J. Agro-Environ. Sci.)
winter green manure