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    STUDIA BIOLOGIA - Ediţia nr.1 din 2005  
         
  Articol:   ENZYMATIC ACTIVITIES IN A BROWN LUVIC SOIL.

Autori:  ALINA DORA SAMUEL, MIHAI DRĂGAN-BULARDA, CORNEL DOMUÅ¢A. 		 
       
         
  Rezumat:  Actual and potential dehydrogenase, catalase, acid and alkaline phosphatase activities were determined in the 0–20-, 20–40- and 40–60-cm layers of a brown luvic soil submitted to a complex tillage (no-till and conventional tillage), crop rotation (2- and 6-crop rotation) and fertilization {mineral(NP) fertilization and farmyard-manuring} experiment. Each activity decreased with increasing sampling depth. No-till – in comparison with conventional tillage – resulted in significantly higher soil enzymatic activities in the 0–20-cm layer and in significantly lower activities in the deeper layers. The soil under maize or wheat was more enzyme-active in the 6- than in the 2-crop rotation. In the 2-crop rotation, higher enzymatic activities were recorded under wheat than under maize. Farmyard-manuring of maize – in comparison with its mineral (NP) fertilization – led to a significant increase in each activity. The enzymatic indicators of soil quality calculated from the values of enzymatic activities determined in the plots of the 6-crop rotation showed the order> farmyard-manured maize > minerally fertilized (m.f. wheat) > m. f. maize (plot 6) > m.f. soybean > m.f. maize (plot 3) > m.f. oats-clover.  
         
     
         
         
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