Mirshekali, H. and Hadi, H. and Amirnia, R. and Khodaverdiloo, H.
(2012)
Effect of zinc toxicity on plant productivity, chlorophyll and zn contents of sorghum (sorghum bicolor) and common lambsquarter (chenopodium album).
International Journal of Agriculture: Research and Review, 2 (3).
pp. 247-254.
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Abstract
Zinc (Zn) as a heavy metal plays an important role in many biochemical functions of plants.
However, the excess amount of zinc is one of the most important growth limiting factors in soils. In the
present study, the effects of various concentrations of Zn on biomass, chlorophyll content, and Zn contents of
Sorghum bicolor and Chenopodium album were studied at research field of Urmia University, Urmia, Iran, in
2011. The plants were grown in pots over a 3 month period in soils containing zinc concentration varying
between 100.7, 300.7, 500.7, 900.7, 1300.7 and 2100.7 mgzii/kgsoil. At the end of growing season, plant height,
chlorophyll a, b, and total chlorophyll content, biomass, Zn concentration in the plants and bio-available Zn of
the soils were measured. Results indicated that, generally, with increasing Zn concentration in soil, plant
height, content of a, b, and total chlorophyll and biomass were decreased significantly (r0.05). With an
increase in soil Zn concentration, Zn in Common lambsquarter was increased up to a maximum of 1213
mg/kg (in concentration 2100 mgziiLkgsoil). The maximum Zn concentration in sorghum was 2538 mg/kg (in
concentration 500 mgz1 /kgs01). In addition, there was significant correlation between NH4NO3- extractable soil
Zn and response of plants to Zn pollution
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