The purpose of this research have been to determine the influence of soil fertilizations systems (fertilization with: nitrogen, phosphorous, nitrogen and phosphorous, farmyard manure) on the physical properties (penetration hardness) and chemical properties (humidity, metals) 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 (nickel, copper, zinc, arsenic, lead) have been recorded for wheat experimental variant -fertilized with N90P75 kg/ha (a1b4), and the highest content have been recorded for manganese (766 mg/kg dry matter), and for the wheat experimental variant a1b4, respectively (wheat-fertilized with N90P75 kg/ha active matter), working depth 0-15 cm.

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 (pH, humus, aluminium and phosphorous content) of the soil. The experiments have been carried out in the experimental field of National Agricultural Research and Development Institute � Fundulea, Romania, for: wheat monoculture, 2-year crop rotation (wheat-corn), 3-year crop rotation (wheat-pea-corn), and 4-year crop rotation wheat-sun-flower-pea-corn. The lowest values of the phosphorous content in soil have been recorded for 3-year experimental variant (wheat-pea-corn), unfertilized (a3b1), and the lowest aluminium content in soil 596 mg/kg d.m.) has been recorded for the a4b5 experimental variant (4-year crop rotation wheat-sunflower-pea-corn) � fertilized with N90P75 kg/ha a.m., working depth: 15-30 cm.