The effect of increasing rates of nickel and arsenic on the growth of radish and soil microflora
1999
Simon, T. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
The pot experiment with step contamination by Ni and As was organized. Two soils were used (heavy soil and light soil and four levels of no addition (0), addition to the limit (L) allowed by Czech standards, twice (2L), five (5L) and ten (10L) times the limit for Ni and As, respectively. Addition of Ni to the both soils negatively influenced radish growth and in the case of the highest contaminated treatment the total inhibition of plant germination was recorded. Plant tolerance to Ni and As cohered with the content of mobile fractions of both elements. Concentration of Ni and As in plants was 17 to 160 times higher in highly contaminated treatments comparing to zero variants. An addition of Ni in the highest amounts caused significant drop down of total number of bacteria and number of sensitive Azotobacter. Simultaneously, due to high contamination (especially Ni) numbers of micromycetes increased.
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