engleski

Vertical distribution of soil organic carbon under different nitrogen fertilization levels

Knowledge of nitrogen fertilization contribution to the soil organic carbon (SOC) variability is very important in order to preserve the climate-regulating role of soil through measures of sustainable soil management. The aim of this research was to determine SOC distribution up to 2 meters in drained distric Stagnosol according to different nitrogen fertilization levels. SOC content was determined in 128 soil samples which were sampled from experimental plot (central Croatia, Potok location) after 10 years of fertilization (0, 100, 200, 300 kg N/ha/per year) on eight depths (each 25 cm up to 2 m) in four replications. SOC was determined indirectly by calculation from total soil carbon and carbonate content. Results reveal that long term application of 200 and 300 kg N/ha significantly contribute to SOC enrich especially in surface soil layer. Along with those findings, SOC content was significantly reduced through soil profile on all treatments. The largest SOC stock (615 t/ha) was determined on treatment with 200 kg N/ha applied

Soil profile ; Arable land ; Carbon stocks ; Stagnosols

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