30 / 2015-11-21 02:39:46

Tillage systems and fertilization effect on seasonal CO2 and N2O emissions for orthic luvisol under spring barley

8421,8422,8423,8424,GHGs emissions

Abstract: The objective of this study was to evaluate the effect of conventional tillage (CT) and reduced tillage (RT) combined with unamended control (N0) and addition of nitrogen fertilizers (N1) on soil N2O and CO2 emission from cropland during the studied period (April-December in 2012). Weekly N2O and CO2 fluxes, soil temperature, and soil water content were monitored during the studied period in western Slovakia. Soil CO2 emission generally did not differ between conventional tillage compared with reduced tillage for both nitrogen treatments. A significant correlation (p < 0.05) between the CO2 flux and soil temperature in conventionally and reduced tilled plots could lead to the easy conclusion that only the soil temperature (and not the soil moisture) was a controlling factor for fertilized and not fertilized plots, which wasn’t our case. N2O emission decreased in order CT>RT for both fertilization levels N0 and N1. The cumulative N2O fluxes from CT with N0 treatment (6.4 kg N2O-N ha-1) were higher by 68 % compared to the RT (3.8 kg N2O-N ha-1). And cumulative N2O fluxes from CT with N1 treatment (7.0 kg N2O-N ha-1) were higher by 66 % compared to the RT (4.2 kg N2O-N ha-1). In case of N2O can be concluded that management events play an important role in N2O emission patterns where fertilization, tillage, harvest combined with rain events and increasing soil temperature had the highest influence.