Abstract:
The Zn ion is part of 70 metal-enzymes, it actions as an activator for
some enzymes having a physiological role and it also has a tempering role in
the polypeptide action. The Zn is at the same time an essential component in
establishing the cytoplasm ribosome. The Zn activates the tryptophan
synthesis which is an intermediary product for obtaining the auxin (the -
indoleacetic acid). The Zn is involved in the nitrates reduction; in case of Zn
deficiency the ribonuclease activity is diminished, it accumulates in nitrates
plants, amides, organic acids that cannot be oxidized through the breathing
system. The zinc deficiency affects the plants and it can be seen especially in
fruit trees, corn, beans, and potatoes. A study on zinc concentrations is
required for the above mentioned cultures, especially in the areas where
agriculture is an important economical branch.
The technique of speciation in the soil treatment was applied in order
to monitor the zinc possible manifestations in the soil. After that the
spectrophotometric method was applied with the purpose of dosing the
changeable, unchangeable, organic Zn content from the soil.
The present study was performed on garden soil from Galati County,
the Covurlui valley. It was discovered that the zinc from the soil can be found
in the 3-22ppm domain. The acid, neutral or basic character is tightly
connected to the changeable Zn. The zinc in the soil can be found in small
quantity under 1 ppm and it is represented by the zinc salts (ZnS, ZnCO3)
which are soluble in an acid environment. The analyzed soil has the pH 7-
7,4. The changeable zinc has a 5,12-6,45 ppm concentration. The
unchangeable zinc has a 9 ppm concentration. In the organic part of the soil,
the zinc found as metal-complexes being in 8,6 ppm concentration. The
retention of Zn under unchangeable form in clay, with a neutral pH related to
the chelate groups and complexes with the organic matter which can be a
cause for the plants zinc deficiency.
