Effects of Soil Amendments on Growth and Metal Uptake by Ocimum gratissimum Grown in Cd/Zn-Contaminated Soil

Soil amendments have been proposed for immobilizing metallic contaminants, thus reducing their uptake by plants. For the safe production of crops in contaminated soil, there is a need to select suitable amendments that can mitigate heavy metal uptake and enhance crop yield. The present experiment compared the effects of three amendments, hydroxyapatite (HAP), organic manure (OM), and biochar (BC), on plant growth and heavy metal accumulation by maize in an acidic soil contaminated with Cd, Pb, and Zn, and their potential for safe crop production. Toxicity characteristic leaching procedure (TCLP) tests, energy dispersive X-ray spectroscopy (EDS) analysis, and X-ray diffraction (XRD) analysis were used to evaluate the effectiveness and mechanisms of heavy metal immobilization by the amendments. The results showed that shoot and root biomass was significantly increased by HAP and 1% OM, with an order of 1% HAP > 0.1% HAP > 1% OM, but not changed by 0.1% OM and BC (0.1% and 1%). HAP significantly decreased Cd, Pb, and Zn concentrations in both shoots and roots, and the effects were more pronounced at the higher doses. OM decreased the shoot Cd and Pb concentrations and root Zn concentrations, but only 1% OM decreased the shoot Zn and root Pb concentrations. BC decreased the shoot Cd and Pb concentrations, but decreased the shoot Zn and root Pb concentrations only at 1%. HAP decreased the translocation factors (TFs) of Cd, Pb, and Zn (except at the 0.1% dose). OM and BC decreased the TFs of Cd and Zn, respectively, at the 1% dose but showed no significant effects in other cases. Overall, plant P, K, Fe, and Cu nutrition was improved by HAP and 1% OM, but not by 0.1 OM and BC. Soil pH was significantly increased by HAP, 1% OM, and 1% BC, following an order of 1% HAP > 1% OM > 0.1% HAP > 1% BC. The TCLP levels for Cd, Pb, and Zn were significantly reduced by HAP, which can be partly attributed to its liming effects and the formation of sparingly soluble Cd-, Pb-, and Zn-P-containing minerals in the HAP-amended soils. To some extent, all the amendments positively influenced plant and soil traits, but HAP was the optimal one for stabilizing heavy metals, reducing heavy metal uptake, and promoting plant growth in the contaminated soil, suggesting its potential for safe crop production.

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Remediation of heavy metal polluted soil through organic amendments

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v42i4.35786 ◽

2018 ◽

Vol 42 (4) ◽

pp. 589-598 ◽

Cited By ~ 1

Author(s):

HM Naser ◽

MZ Rahman ◽

S Sultana ◽

MA Quddus ◽

MA Haoque

Keyword(s):

Contaminated Soil ◽

Water Hyacinth ◽

Metal Content ◽

Metal Uptake ◽

Organic Materials ◽

Poultry Manure ◽

Organic Amendments ◽

Cow Manure ◽

Barnyard Grass ◽

Type Water

This study was conducted to determine the effects of organic materials to remediate contaminated soil with heavy metals. A pot study was performed by growing maize (Zea mays) in metal contaminated soil (10 kg pot-1) and soils amendments with cow manure dust, poultry manure dust, vermicompost dust, fern dust, water hyacinth dust, mustard stover dust and barnyard grass dust each at 5 g kg-1 soil. The results showed that Pb, Cd, Ni, Cr and Co uptake by maize depended on the organic materials type. Water hyacinth dust, fern dust, mustard stover dust, and barnyard grass dust addition led to decreased metal content in maize, and this decrease was better expressed with 20.5 to 33.3% for fern dust, 17.3 to 22.0 % for water hyacinth, 18.6 to 21.3% for mustard stover dust, 17.33 to 20.5% for barnyard grass dust. Cow manure dust, poultry manure dust and vermicompost dust led to increased metal content in the maize, and this increase was 6.80 to 18.7 % for cow manure, 18.9 to 86.7 % for poultry manure and 17.4 to 16.0 % for vermicompost. The different effectiveness of organic amendment on metal uptake by maize plant could be due to the nature of organic matter where water hyacinth dust, fern dust, mustard stover dust, and barnyard grass dust were mainly originated from plant. On the other hand, cow manure, poultry manure and vermicompost were mainly the excreta collected from cattle, poultry and earthworms. However, immobilization and phytoextraction techniques might be used to remediate soils which are contaminated with heavy metal.Bangladesh J. Agril. Res. 42(4): 589-598, December 2017

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Assembly of root-associated bacterial community in cadmium contaminated soil following five-year consecutive application of soil amendments: Evidences for improved soil health

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.128095 ◽

2021 ◽

pp. 128095

Author(s):

Zhongyi Cheng ◽

Jiachun Shi ◽

Yan He ◽

Laosheng Wu ◽

Jianming Xu

Keyword(s):

Bacterial Community ◽

Contaminated Soil ◽

Soil Amendments ◽

Soil Health ◽

Cadmium Contaminated Soil

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Kestabilan Inokulan Azotobacter selama Penyimpanan pada Dua Suhu

Jurnal Natur Indonesia ◽

10.31258/jnat.14.1.52-55 ◽

2012 ◽

Vol 14 (1) ◽

pp. 52

Author(s):

Reginawanti Hindersah ◽

Rija Sudirja

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Root Growth ◽

Contaminated Soil ◽

Metal Uptake ◽

Room Temperature ◽

Heavy Metal Uptake ◽

Total N ◽

The Stability ◽

Temperature Storage

Azotobacter might be used as biological agents in bioremediation of heavy metal-contaminated soil since this rhizobacteria produceexopolysachharides (EPS) that mobilize soil heavy metals, and phytohormones that regulate root growth. So that heavy metal uptake bythe roots could be increased. The objective of this research was to verify the stability of EPS and phytohormones in Azotobacter liquidinoculants during four months in different temperature storage. Liquid inoculants has been produced in EPS-induced media and stored in200C and room temperature (24-270C) during four months. The results showed that the better temperature storage was room temperatureinstead of 20 0C since pH, total N, and EPS and phytohormones content was relatively stable during storage.

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Synergistic association of endophytic fungi enhances tolerance, growth, and heavy metal uptake of Alocasia calidora in landfill contaminated soil

Applied Soil Ecology ◽

10.1016/j.apsoil.2021.104307 ◽

2022 ◽

Vol 170 ◽

pp. 104307

Author(s):

Auwalu Hassan ◽

Agamuthu Pariatamby ◽

Innocent C. Ossai ◽

Aziz Ahmed ◽

Mohd Afzanizam Muda ◽

...

Keyword(s):

Heavy Metal ◽

Endophytic Fungi ◽

Contaminated Soil ◽

Metal Uptake ◽

Heavy Metal Uptake

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Effects of AM Inoculation and Organic Amendment, Alone or in Combination, on Growth, P Nutrition, and Heavy-Metal Uptake of Tobacco in Pb-Cd-Contaminated Soil

Journal of Plant Growth Regulation ◽

10.1007/s00344-012-9265-9 ◽

2012 ◽

Vol 31 (4) ◽

pp. 549-559 ◽

Cited By ~ 33

Author(s):

Fa Yuan Wang ◽

Ling Wang ◽

Zhao Yong Shi ◽

You Jun Li ◽

Zhi Mei Song

Keyword(s):

Heavy Metal ◽

Contaminated Soil ◽

Metal Uptake ◽

Organic Amendment ◽

Heavy Metal Uptake ◽

P Nutrition

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Induced-phytoextraction of heavy metals from contaminated soil irrigated by industrial wastewater with Marvel of Peru (Mirabilis jalapa L.)

Plant Soil and Environment ◽

10.17221/148/2011-pse ◽

2011 ◽

Vol 57 (No. 8) ◽

pp. 364-371 ◽

Cited By ~ 15

Author(s):

Y.B. Sun ◽

G.H. Sun ◽

Q.X. Zhou ◽

Y.M. Xu ◽

L. Wang ◽

...

Keyword(s):

Heavy Metals ◽

Contaminated Soil ◽

Industrial Wastewater ◽

Metal Uptake ◽

Primary Objective ◽

Shoot Biomass ◽

Heavy Metal Uptake ◽

Aerial Parts ◽

Mirabilis Jalapa ◽

Induced Phytoextraction

The primary objective of this study was to evaluate the effect of ethylene diamine tetraacetic acid (EDTA) and citric acid (CA) on Mirabilis jalapa L. growth and phytoextraction of heavy metals from the multi-metal contaminated soil. The results showed that the application of CA (5 and 8 mmol/kg) and EDTA (5 mmol/kg) increased plant growth, while when the concentration of EDTA was up to 8 mmol/kg, the shoot biomass significantly decreased relative to the control plants (P < 0.05); it suffered 48.1%, 53.1%, 58.9%, and 78.2% reduction, respectively, compared to CK, CA-5, CA-8, and EDTA-5. EDTA was more effective than CA at increasing heavy metal uptake in aerial parts of the plants, the shoot concentrations of Cd, Cu, Pb, and Zn increased by 0.55, 3.08, 3.28, and 1.0-fold in the 8 mmol/kg EDTA-treated soils relative to the treatment of 8 mmol/kg CA. The maximum of Cd, Cu, and Pb phytoextraction and remediation factor (RF) were found with 5 mmol/kg EDTA treatment. For Zn, 8 mmol/kg EDTA was most efficient in increasing Zn accumulation in aboveground of M. jalapa.

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