OANA-MARIA MUSCALU (PLESCAN), VALENTIN NEDEFF, IOAN GABRIEL SANDU, ELENA PARTAL, EMILIAN MOSNEGUTU, NARCIS BARSAN, ION SANDU, DRAGOS RUSU INFLUENCE OF MAIN WORKS SYSTEMS ON PHYSICAL AND CHEMICAL PROPERTIES OF THE SOIL The purpose of this research have been to determine the influence of soil main works systems (no tillage, fall tillage, spring tillage, discing in) on the physical properties (penetration hardness, air speed in soil) and chemical properties (humidity, humus, total nitrogen, calcium, chlorides) of the soil. The experiments have been carried out in the experimental field of National Agricultural Research and Development Institute - Fundulea, Romania, for a corn monoculture. The highest values of the soil penetration hardness have been recorded for the corn monoculture for which the spring tillage system had been applied (4.9 MPa, working depth 15-30 cm). The lowest values of total nitrogen and chlorides content have been recorded for the corn monoculture for which the fall tillage system had been applied (1.37 mg/kg d.s., working depth 15-30 cm) in the case of the total nitrogen and for the corn monoculture - discing in system (4.43 mg/100g sol, working depth 0-15 cm).
Keywords: no tillage, fall/spring tillage, discing in, physical and chemical properties of the soil, corn, monoculture