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).

The main objective of the current research is to determine the influence of some soil fertilizations systems on the variation of the content of magnesium, aluminium, potassium, chromium and manganese from the soil. The experiments have been carried out in a experimental field, for a soil cultivated with oleaginous crop. In the case when was applied the variant fertilizations with farmyard manure was registered the higher values of the nutrients content in soil like magnesium, potassium and manganese.

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The purpose of this research has been to determine the influence of soil fertilizations systems (fertilization with: nitrogen, phosphorous, nitrogen and phosphorous, farmyard manure) on the chemical properties (magnesium, aluminium, potassium, calcium, iron and chlorine) of the soil. The experiments have been carried out in the experimental field of National Agricultural Research and Development Institute - Fundulea, Romania, for a wheat monoculture. The lowest values of the metal content in soil (aluminium) have been recorded for wheat experimental variant - fertilized with azote and phosphorous N90P75 (154.8 mg/kg d.m.).Chlorine have the highest content in soil (31.02 mg/100 g soil, 15-30 cm working depth, parcel fertilized with azote 90 kg N/ha) in comparation with the other chemical properties of the soil (content of magnesium, aluminium, potassium, calcium and iron). Keywords: magnesium, aluminium, potassium, calcium, iron, chlorine, farmyard manure, wheat, monoculture