THE CHEMICAL QUALITY EVALUATION OF SOME SOILS (CHERNOZEMS and LUVISOLS) FROM DOLJ COUNTY

Abstract

Agricultural lands represent 79% of the surface of Dolj county and about 84% are used as arable crops. Depending on the culture system chosen, the physical and chemical quality of the soil can be affected in different ways. The chemical quality of some soils from Dolj county (Chernozems, Luvisols) was evaluated using several indicators (soil reaction, organic matter content, total nitrogen, mobile phosphorus and mobile potassium). On the depth of 0-50 cm, in both soils, 75% of the mobile phosphorus values were very low-low, respectively extremely low-low. Most of the studied Luvisols were characterized by low values of the mobile potassium content (50% in the topsoil and 63% on the 0-50cm depth, respectively). High correlation between PAL and KAL content was found in case of Luvisols (R2=0.908) and low in case of Chernozems (R2=0.300). High correlation in case of Luvisols may be due to the applied fertilizers.
The values of the content of organic matter, total nitrogen, mobile phosphorus and mobile potassium were lower in the case of Luvisols compared to Chernozems and in most cases the values of the studied chemical indicators decrease with an increasing depth. According to the analyzed data, these soils have high potential for mineral ang organic fertiliser application.