TITLE:
Bentonite Effects on Zinc Concentration in Plants Irrigated with Wastewater
AUTHORS:
Gilvanise Alves Tito, Lúcia Helena Garófalo Chaves, Francisco De Assis Santos e Silva
KEYWORDS:
Heavy Metals, Corn, Radish, Remediation, Clay, Translocação, Bioaccumulation
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.8 No.10,
September
15,
2017
ABSTRACT: A greenhouse study was conducted to investigate the effect of
bentonite on zinc concentrations in radish and corn irrigated with wastewater.
The experimental units were plastic pots with a capacity of 5 kg and 14 kg for
radish and corn, respectively. The soil was mixed with increasing doses of
bentonite equivalent to 0,30,60 and 90 t·ha-1. The plants were irrigated with poor quality water with a concentration
of 5 mg·L-1Zn. On the occasion of the harvest of radish and corn, that is, at
30 and 60 days after the emergence, respectively, the plants were separated in
aerial part and roots, dried in a forced circulation oven, weighed and ground
for analysis of zinc in the plant tissues. After these analyzes, the
translocation factor (TF), the translocation index (TI), the
bioaccumulation in the plant (BFP) and in the root (BFR) were
calculated. According to the conditions of this research, the incorporation of
bentonite to the soil irrigated with water of inferior quality favored the
development of radish and corn; allowed the retention of the Zn metal in the
soil, reducing the concentrations of this metal in the root of the radish and
in the aerial part of the corn; decreased the transfer of zinc from the soil to
the plants under study.