Impact of chelating agents and bioinoculants on phytoextraction of Pb and Hg by Indian mustard
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Date
2009
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Publisher
CCSHAU
Abstract
Laboratory and screen house studies were carried out to evaluate the effect of chelating
agent (EDTA @ 2 mmol kg-1 in 5 split doses), FYM, vermicompost and microbial
inoculants (Azotobacter and Pseudomonas) on the phytoextractability of Indian mustard
from Pb (200 g g-1) and Hg (40 g g-1) enriched soil. Fractionation studies of Pb and
Hg were also carried out in post harvest soil samples to investigate the contribution of
different fractions on the Pb and Hg accumulation by the Indian mustard. Screen house studies showed that FYM and vermicompost led to higher biomass production as
compared to unamended soil. The bioinoculants also contributed in augmentation of
biomass production but not significantly. The EDTA led to significant decrease in
biomass as compared to FYM and vermicompost. The Pb and Hg concentration
increased significantly in Brassica juncea with the application of EDTA. The application
of FYM and vermicompost also increased concentration of Pb and Hg. The seed
treatment with bioinoculants was helpful in increasing concentration but was not much
effective. The highest concentration of Pb and Hg was recorded in EDTA treatment. The
concentration of Hg was higher in root as compared to shoot. Among all the treatment
combinations, EDTA and bioinoculants treatment combination led to higher uptake of
Pb and Hg. The FYM and vermicompost also increased uptake of Pb and Hg but it was
very less as compared to EDTA. Fractionation studies of post harvest soil samples
showed that application of EDTA led to shift in the distribution of Pb and Hg from more
resistant to more soluble forms. Application of FYM and vermicompost in combination
with bioinoculants led to increase in organic matter bound fraction. The bacterial count
studies showed that application of FYM and vermicompost in Pb and Hg enriched soil
increased counts of Azotobacter and Pseudomonas. Also the application of EDTA
helped in increasing bacterial counts. The bacterial counts also increased with increasing
time. The results suggested that EDTA combined with bioinoculants is good in
increasing uptake of Pb and Hg and also FYM and vermicompost were helpful in
phytoaccumulation of these metals, however, there is a strong need for further
investigation in this aspect.
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Keywords
Animal developmental stages, Genotypes, Eggs, Planting, Yields, Insecticides, Developmental stages, Sexual reproduction, Land resources, Crops