engleski

CLIMATE CHANGE MITIGATION WITH DIFFERENT TILLAGE SYSTEMS

Climate change presents a global warming, the general increase in the earth's near-surface air and ocean temperatures that presents a global problem. To reduce the global temperature, Kyoto Protocol has been adopted on the Third Conference of the Parties to the United Nations Framework Convention on Climate Change in Kyoto in 1997. The Republic of Croatia has signed the Protocol in 1999 and ratified it in 2007, by which it was committed to reduce its greenhouse gas emissions by 5% in the first commitment period between 2008 – 2012 compared to the base year (1990). Aim of our investigation is to determine the best tillage system with the lowest emissions of carbon dioxide from soil. Field experiment with 6 soil tillage systems common to this area was set up on Stagnic Luvisols in Daruvar (N 45º33´937´´, E 17º02´056´´), Central Croatia. Tillage systems differed in tools that were used, depth and direction of tillage. Investigated variants were: check plot (black fallow) - BF, ploughing up/down the slope - PUDS, no-tillage - NT, ploughing across the slope - PAS, ploughing to 50 cm across the slope - VDPAS, subsoiling to 60 cm + ploughing across the slope - SSPAS. Preliminary soil sampling was conducted in April 2011 when cover crop was corn (Zea mays) and the samples were analysed at the laboratory of Department of General Agronomy, Faculty of Agriculture. In this paper the results of vertical and horizontal distribution of total carbon content, total nitrogen content and the C/N rations are shown. Range of total carbon content was from 0.26% at BF (20-30 cm) to 1.40% at NT (0-5 cm). Range of total nitrogen content was from 0.03% at PUDS (20-30 cm) to 0.16% at NT (0-5 cm). Vertical distribution of total carbon and nitrogen content generally decreased with depth. Range of C/N ratio was from 7:1 at BF (0-5 cm) to 11:1 at PUDS (20-30 cm), VDPAS (10-15 cm) and SSPAS (15-20 cm).

Tillage Systems; Carbon and Nitrogen Content; C/N ratio

nije evidentirano