INFLUENCE OF SOME PLANT SPECIES AND SOIL TILLAGE UPON THE FERTILIZATION OF CHROMIC LUVISOL IN THE ROMANIAN PLAIN

Crop plant and basic tillage can influence soil fertility. Grown in the same place after three years, crop plant determines an annual influence that may be modified in the following year. Basic tillage strongly influences the arable horizon, especially when it is repeated several years later. The paper presents our attempts to determine both plant influences in crop rotation and the basic soil loosening maintained unchanged for 12 years. Laboratory analysis was performed in order to determine the effect of chemical, biological and pedo-enzymical influences on 0-20 cm depth of the chromic luvisol horizon where the middle term experiment was placed at Moara Domneasca - Ilfov. Results were statistically analyzed by the multiple comparison method (Snedecor, 1965). The steady conclusions show that the temporary influence of the plant cultivated in a three-year crop rotation, must be ignored. Ploughing and disking by repeated loosening (for 12 years) produced a better state of fertility in comparison with permanent chiselling.