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    STUDIA BIOLOGIA - Ediţia nr.1 din 2006  
         
  Articol:   CORRELATIONS BETWEEN ENZYMATIC ACTIVITIES AND CHEMICAL INDICATORS IN A BROWN LUVIC SOIL.

Autori:  ALINA DORA SAMUEL, MIHAI DRĂGAN-BULARDA, CORNEL DOMUŢA.
 
       
         
  Rezumat:  Actual and potential dehydrogenase and acid phosphatase activities and nitrate, ammonium and mobile phosphorus contents were determined in the 010, 1020 and 2030cm layers of a brown luvic soil submitted to a complex tillage and crop rotation experiment. Each activity and each chemical content in both non-tilled and conventionally tilled soil under crops of both rotations decreased with increasing sampling depth. It was found that no-till in comparison with conventional tillage resulted in significantly higher soil enzymatic activities and nitrate, ammonium and mobile phosphorus contents in the 010 and 1020cm layers and in significantly lower activities and chemical contents in the deeper layers. The soil under wheat or maize was more enzyme-active in the 6 than in the 2crop rotation. In the 2crop rotation, higher enzymatic activities were registered under maize and under wheat, excepting acid phosphatase activity; nitrate, ammonium and mobile phosphorus contents were significantly higher under maize. In the 6crop rotation, higher enzymatic activities were registered under wheat, excepting actual dehydrogenase activity; ammonium and mobile phosphorus contents were higher under wheat. There were positive correlations between enzymatic activities and chemical indicators under each drop of both rotations.  
         
     
         
         
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