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    STUDIA BIOLOGIA - Ediţia nr.1 din 2002  
         
  Articol:   EFFECT OF NICKEL ON WHEAT PLANTS, SOIL MICROORGANISMS AND ENZYMES.

Autori:  NADA MILOŠEVIĆ, MITAR GOVEDARICA, RUDOLF KASTORI, NOVICA PETROVIĆ. 		 
       
         
  Rezumat:  In a pot experiment, 21-day-old wheat plants were treated with NiCl2 at rates of 0, 0.02, 2 and 200 mg Ni/kg soil. On day 14 after this treatment, plants and soil were sampled and analysed for evaluation of the effect of Ni on the plant growth, chlorophyll content, respiration and transpiration intensity, on the numbers of some soil microorganisms (aerobic heterotrophic, ammonifying, aerobic free-living N2-fixing bacteria and, separately, Azotobacter cells, as well as actinomycetes and micromycetes) and on the soil dehydrogenase, protease, endoglucanase, cellobiohydrolase and -glucosidase activities. The results have shown that plant growth was stimulated by the low rate of Ni and inhibited by the high Ni rate. Chlorophyll content decreased, while intensity of respiration increased at each Ni rate. Transpiration was intensified by the low and medium Ni rates and reduced by the high Ni rate. Nickel strongly reduced the numbers of soil microorganisms, excepting the number of Azotobacter cells, which exhibited a significant increase at the low Ni rate and insignificant increases at the medium and high Ni rates. The enzyme activities were very sensitively affected by the medium and high Ni rates.  
         
     
         
         
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