Žemės dirbimo įtaka dirvožemio kvėpavimui ir mikroorganizmų biomasės sankaupoms

Abstract

The results on soil humus accumulation, soil respiration and microbial biomass pools are presented. It was aimed to evaluate impact of different soil tillage and ecological agriculture system on above mentioned parameters. soil organic carbon, soil respiration and microorganisms biomass pools. The field experiment was conducted at the Lithuanian Institute of Agriculture at 2009 and 2013 were designed to study the effects of soil tillage and ecological agriculture system. The variants of experiment: conventional tillage (TD) – deep ploughing (23–25 cm) and spring time cultivation (4-5 cm), reduced tillage (SD) – shallow ploughing (14–16 cm) and spring cultivation (4–5 cm), no tillage (TS) – direct drilling and no cultivated. Thus, ecological agriculture system was included. The results showed that the highest humus concentrations were estimated in ecological agriculture system. The differences were significant by 3.16 %. The highest concentration of microorganism biomass was also estimated in ecological agriculture system. Thus, microbial biomass was 397.47 μg C g-1 and was substantial differed in comparison with other soil tillage systems. The strong correlation between microbial biomass N and biomass C was estimated, it was found that microbial biomass N in soul could be expressed by correlation formula y=0.208x+16.755.