USE OF "MODERN" SOIL ORGANIC MATTER PARAMETERS FOR STUDYING OF ITS CHANGES IN AGGREGATES UNDER DIFFERENT MANAGEMENT SYSTEMS IN A VINEYARD

Abstract

The effect of different soil management practices on the changes in soil organic matter was evaluated according to “modern” parameters such as: lability index (LI), carbon pool size index (CPI) and carbon management index (CMI). In 2006, an experiment of the different management practices in a productive vineyard was established in Rendzic Leptosol in the Nitra-Dražovce locality. During the years 2008-2011, the soil samples were taken from following treatments: 1. O – (tillage), 2. O+MH (tillage+farmyard manure), 3. TTP (grass without fertilization), 4. TTP+NPKS3 – 3^-rd degree of fertilization intensity for vine, and 5.  TTP+NPKS1 – 1^-st degree of fertilization intensity for vine. Obtained results showed that in O treatment, the highest values of LI and the lowest values of CPI in all size fractions of water-stable aggregates were determined. Lower values of LI were in water-stable micro-aggregates than in macro-aggregates. Overall, soil organic matter in water-stable micro-aggregates was stabile and doses of nutrients in 1^-st intensity of fertilization for vine can have positive effect on carbon sequestration. On the other hand, higher doses of nutrients (3^-rd degree of fertilization intensity for vine) due to indirect mechanisms (higher biomass) can increase organic matter concentration in water-stable macro-aggregates of size 0.25-1 mm.