Short-term soil carbon dioxide (CO2) emission after application of conventional and reduced tillage for red clover in Western Slovakia

摘要

Tillage systems have impact on soil properties, crop growth and through this directly and indirectly influence the cropland CO 2 emission and therefore t he global warming. In Slovakia, the wider adoption of conservation practices has barriers such as large acreage of compacted soils, the absence of detailed regionalization of suitable soils for such practices and the scientific evaluation of its applicatio n on sustainable soil productivity and environment protection. This study evaluated the short - termeffect of conventional tillage (CT) and reduced tillage (RT) with (N1) and without (N0) N fertilizer application on soil CO 2 emission from cropland planted wi th a red clover ( Trifoliumpratense ) during 40 days in 2013 on a tillage field experiment initiated in 1994. CO 2 flux, soil temperature, and soil water contentwere monitored during the studied period in western Slovakia.Results of this study showed that the re wasn't significant difference ( p 0.05) in soil CO 2 between conventional tillage and reduced tillage for both, not fertilized and fertilized plots. Averaged 40 days CO 2 emissions were greater in reduced tillage as compared to conventional tillage for bo th fertilization levels. A linear regression between CO 2 emission and soil temperature in conventionally and reduced tilled plots showed that soil temperature (r = 0.88 - 0.94; P 0.05) and not the soil moisture was a controlling factor. The highest CO 2 emis sion were recorded on the CT and RT plots during the first two weeks after tillage, showing that the tillage resulted in a rapid physical release of CO 2 .