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    STUDIA BIOLOGIA - Issue no. 1 / 2005  
         
  Article:   ENZYMATIC ACTIVITIES IN A BROWN LUVIC SOIL.

Authors:  ALINA DORA SAMUEL, MIHAI DRĂGAN-BULARDA, CORNEL DOMUŢA.
 
       
         
  Abstract:  Actual and potential dehydrogenase, catalase, acid and alkaline phosphatase activities were determined in the 020-, 2040- and 4060-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 020-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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