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    STUDIA BIOLOGIA - Ediţia nr.2 din 2000  
         
  Articol:   PHOSPHATASE ACTIVITIES IN A BROWN LUVIC SOIL.

Autori:  ALINA SAMUEL, ŞTEFAN KISS, MARIA ŞANDOR.
 
       
         
  Rezumat:  Phosphatase (phosphomonoesterase) 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 rotations) and fertilisation [mineral (NP) fertilisation and farmyard-manuring] experiment. It was found that the activities decreased in the order: phosphatase activity measured in unbuffered reaction mixtures > acid phosphatase activity > alkaline phosphatase activity. Each activity decreased with increasing sampling depth. No-till in comparison with conventional tillage resulted in significantly higher soil phosphatase activities in the 020-cm layer and in significantly lower activities in the deeper layers. The soil under maize or wheat was more phosphatase-active in the 6- than in the 2-crop rotation. In the 2-crop rotation higher soil phosphatase activities were recorded under wheat than under maize. Farmyard-manuring of maize in com-parison with its mineral (NP) fertilisation led to a significant increase in each activity. The enzymatic indicators of soil quality calculated from the values of phosphatase activities determined in the plots of the 6-crop rotation showed the order: farmyard-manured maize > minerally fertilised (m.f.) soybean > m.f. clover > m.f. maize (plot 4) > m.f. wheat > m.f. maize (plot 1). This order means that by determination of phosphatase activities valuable information can be obtained regarding fertility status of soils.  
         
     
         
         
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