CO2 efflux and microbial activities in undisturbed soil columns in different nitrogen management  

https://doi.org/10.17221/216/2016-PSECitation:Molnár E., Szili-Kovács T., Villányi I., Knáb M., Bálint Á., Kristóf K., Heltai G. (2016): CO2 efflux and microbial activities in undisturbed soil columns in different nitrogen management  . Plant Soil Environ., 62: 402-407.
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The surface carbon dioxide (CO2) fluxes together with the soil microbial biomass and activity in undisturbed soil columns were studied in three growing seasons. Soil columns had six treatments: (1) control without plants; (2) mineral fertilized without plants; (3) no fertilizer and maize plants; (4) mineral fertilized and maize plants; (5) manure and maize plants; (6) mineral fertilized plus manure and maize plants. Soil microbial biomass was measured by substrate-induced respiration (SIR) and microbial activity as fluorescein-diacetate hydrolysing activity (FDA). Treatments had a significant effect (P < 0.001) on CO2 fluxes, SIR and FDA. The presence of maize increased CO2 efflux, SIR and FDA compared to unplanted column. Fertilizer + manure treatment resulted in the greatest plant biomass and the greatest CO2 efflux. Significant correlation (r = 0.680; r = 0.586 in two consecutive years) between SIR and FDA was found.  
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