Appropriately Reduced Nitrogen and Increased Phosphorus in Ratooning Rice Increased the Yield and Reduced the Greenhouse Gas Emissions in Southeast China.

Effects of Different Nitrogen and Phosphorus Fertilization Treatments in Ratooning Rice on Greenhouse Gas Emissions During the ratooning season, methane (CH 4 ) emissions showed a trend of initially increasing and then decreasing, with a peak around 25 days after the first season’s harvest ( Figure 2 ).

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With a 10% reduction in nitrogen fertilizer, ‘Luyou 1831’ showed an initial increase and then a decrease in cumulative N 2 O emissions in 2022, and a decreasing trend in 2023. ‘Yongyou 1540’ showed an increasing trend in cumulative N 2 O emissions in 2022, and a decreasing trend in 2023.

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With a 20% reduction in nitrogen fertilizer, the yield showed an increasing trend as the amount of phosphorus fertilizer increased.

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