Effects of Different Manures in Combination with Fulvic Acid on N2O and CO2 Emissions in Greenhouse Soil
To investigate the effects of different manures in combination with fulvic acid on N2O and CO2 emissions in greenhouse soil,two seasons of Chinese cabbage(Brassica chinensis L.)were grown in the greenhouse plots,and the emission fluxes and cumulative emissions of N2O and CO2,related environmental factors and vegetable yields were determined.The results showed that N2O emission mainly occurred in the second week after manure application,while CO2 emission mainly in the middle and late stages of vegetable growth.There were no significant differences in the emission fluxes and cumulative emissions of N2O and CO2 among the treatments of single application of pig,chicken and sheep manures.But different manures in combination with fulvic acid increased the emissions of N2O and CO2.The single application of pig manure or sheep manure was more effective in enhancing the vegetable yield than chicken manure,and additional application fulvic acid with manures increased the vegetable yield.The main factors influencing N2O and CO2 emissions were the soil water content,pH,NH4-N and NO3-N.In conclusion,considering both greenhouse effect and vegetable yield,the sheep manure applied with fulvic acid performs best.
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