Effect of combined application of organic and inorganic fertilizers on N2O emissions from a peri-urban protected vegetable field with sweet corn planting
To investigate the effect of combined application of organic and chemical fertilizers on N2O emissions,a typical peri-urban protected vegetable field with sweet corn planting was chose as the research object,and a field experiment was conducted with four treatments,including no fertilizer(CK),conventional fertilizer(CON),30%cow dung organic nitrogen fertilizer +70%inorganic nitrogen fertilizer(CM),and 30%chicken dung organic nitrogen fertilizer +70%inorganic nitrogen fertilizer(NM).The N2O emission fluxes were measured by the static opaque chamber-gas chromatography method during the growing season,with soil ammonium nitrogen,nitrate nitrogen,and soluble organic carbon(DOC)contents as well as crop yield and nitrogen uptake also measured.Results show that the cumulative N2O emissions were much high during the sweet corn(Zea mays var.rugosa Bonaf.)season,ranging from 24.6～33.6 kg/hm2.The N2O emissions per unit yield were reduced by 35.7%and 19.0%for the CM and NM treatments,respectively,in comparison to the CON treatment.The CM treatment demonstrated a significant reduction in cumulative N2O emissions per unit area by 26.9%,while the NM treatment did not reduce N2O emissions significantly.The soil nitrate nitrogen content was significantly reduced by 40.4%in the NM treatment compared to the CON treatment,and the soil ammonium nitrogen content was reduced by 60.7%and 50.1%in the CM and NM treatments,respectively.The soil DOC contents in the CM and NM treatments did not show significantly change.N2O emissions fluxes were significantly and positively correlated with soil ammonium nitrogen,nitrate nitrogen,and DOC contents.This suggests that replacing chemical fertilizer with organic fertilizer could reduce N2O emissions by reducing the amount of available inorganic nitrogen in the soil.Furthermore,the yield of CON,CM,and NM treatments increase 156.5%,191.8%,and 188.2%,respectively,compared to the CK treatment.The yield of CM and NM treatments increase 13.8%and 12.4%,respectively,compared to the CON treatment.Moreover,the nitrogen fertilizer use efficiency of the CM treatment increased by 15.2%compared to the CON treatment.In conclusion,the combined application of 30%organic fertilizer and 70%chemical fertilizer proved effective in reducing N2O emissions and increasing yields in sweet corn fields.Additionally,the use of cattle manure was found to be more effective.
combined application of organic and inorganic fertilizersnitrous oxidenitrogen fertilizer use efficiencyyieldprotected vegetable soil
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