The thesis deals with scavenging on invertebrate cadavers. The goal was to estimate the dynamics of revelation and consumption of the cadavers by scavengers and to evaluate different effects influencing the dynamics in two agricultural habitats meadow and arable field.

In the organic cropping system, with the use of soil mulching it is possible to significantly reduce weed incidence in a crop stand, to enrich the soil with nutrients and to obtain the highest yield of satisfactory quality. Having discontinued mulching, its residual effect on agricultural crops persists. The effect of previously used and soil-incorporated organic mulches on weed emergence, soil properties and agricultural crops persists for a different period of time and becomes weaker with time. / Ekologinės žemdirbystės sistemoje, naudojant dirvožemio mulčiavimą, galima iš esmės sumažinti pasėlio piktžolėtumą ir praturtinti dirvožemį maisto medžiagomis bei gauti didžiausią geros kokybės derlių. Atsisakius dirvožemį mulčiuoti išlieka mulčio liekamasis poveikis žemės ūkio augalų pasėliams. Anksčiau naudotų ir įterptų į dirvožemį organinių mulčių poveikis piktžolių dygimui, dirvožemio savybėms ir žemės ūkio augalams trunka nevienodą laikotarpį ir silpnėja.

The experiment was exsecuted in Experimental station of Lithuanian university of agriculture in 2005. The objectives of field experiment was to evaluate effect of reduced tillaged and no tillaged on soil physical properties: bulc density, sheare strength, moisture content, fore volume. Five different tillage treatments were arranged: deep ploughing (GA), shallow ploughing (SA), deep coultivation and discing (GP), shallow discing (SP), no tillage, direct drilling (ND). Change of common soil tillage with simplificated soil tillage and direct sowing to no tillaged soil had not fundamental hold to the soil physical properties: bulc density, moisture content, fore volume. But shallow discing in comparison with deep ploughing slumped sheare strength 10.17 %. Common and simplificated soil tillage had not fundamental holdfor earth worms biomass in barley. In shallow disced soil (SP) earth worms biomass increased to 43.7 %. In no tillage soil biomass of earth worms increased 133.5 %. Shallow discing and sowing to no tillage soil fundamentally increased weed-grow in bushing-out stage. Spread of weeds in simplificately tillaged soil possible to escape with spraying the crop with herbicides. But in no tillaged soil it was not enough. Simplificated soil tillage and sowing to no tillaged soil had not hold for energy of barley germination and for number of productive stems. In no tillaged soil in comparison with deep ploughing, yield of barley slumped 14.5 %.