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Kashem, Md. Abul; Singh, Bharat Raj

doi:10.1023/a:1013762204510

Cited by 273 publications

(54 citation statements)

References 20 publications

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“…Table 1 (9). Heavy metals usually have higher availability in acidic soil than in neutral or basic soil (13,14). However, the availability of heavy metals (except for Mn) was higher in samples with higher pH (Table 2), but we are aware that their availability depends on many factors other than pH, e.g.…”

Section: Soil Aciditymentioning

confidence: 97%

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Accumulation of heavy metals from soil in medicinal plants

Glavač

Djogo

Ražić

et al. 2017

Archives of Industrial Hygiene and Toxicology

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Medicinal plants accumulate heavy metals from contaminated soil, and their consumption can cause poisoning. Our objective was to determine the levels of Pb, Cd, Zn, Cu, Fe, and Mn in four medicinal plant species (Achillea millefolium, Hypericum perforatum, Plantago lanceolata, and Urtica dioica) and their native soil, all sampled at a former smelter. The highest soil Cd, Pb, and Zn levels surpassed the maximum allowed limit 75-fold, 48-fold, and 14-fold, respectively. Their soil levels correlated with those in the plants, but this was not the case with Cu, Fe, and Mn. Heavy metal accumulation seems to depend on the plant species, yet even so, medicinal herbs should be cultivated and gathered only from controlled (uncontaminated) areas. Polluted areas should be monitored on a regular basis, while further research should investigate the connection between the heavy metal levels in the soil, their levels available for plants, and the levels extractable from plants.

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Section: Soil Aciditymentioning

confidence: 97%

“…Real acidity is the concentration of H + in a water solution of a soil sample, whereas potential or exchangeable acidity also includes H + adsorbed on the soil colloids. Heavy metals usually have higher availability in acidic soil than in neutral or basic soil (13,14).…”

Section: Soil Aciditymentioning

confidence: 99%

Accumulation of heavy metals from soil in medicinal plants

Glavač

Djogo

Ražić

et al. 2017

Archives of Industrial Hygiene and Toxicology

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show abstract

“…Kashem and Singh (2001) reported oxygen is reduced at Eh > 300 mV and Mn 4+ at Eh of 200 mV. We observed that Eh decrease with decreasing pH, especially with organic material treatment.…”

Section: Red Clayey Soilmentioning

confidence: 48%

“…We observed that Eh decrease with decreasing pH, especially with organic material treatment. Kashem and Singh (2001) reported that organic material had contributed to low and negative values of Eh resulting into higher increase in pH values.…”

Section: Red Clayey Soilmentioning

confidence: 99%

Silicon Release from Local Materials in Indonesia under Submerged Condition

Anggria¹,

Husnain²,

Sato³

et al. 2016

JAS

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Five inorganic materials (steel slag, silica gel, electric furnace slag, fly ash and Japanese silica fertilizer) and six organic materials (rice husk-biochar, rice straw compost, media of mushroom, cacao shell-biochar, rice husk-ash and elephant grass), were evaluated as Si fertilizer sources for rice plants (Oryza sativa L.) in two soil types (red clayey and sandy soil). Evaluation was carried out by incubating them at 30 o C under submerged condition for 70 days. The soil solution was replaced at day 7, 14, 21, 42, 49, 56, 63 and 70 and the amount of silicon (Si) release, pH, Eh, calcium (Ca), magnesium (Mg), iron (Fe) and manganese (Mn) concentrations in soil solutions were determined. The amount of Si release ranged from n.d. (not detected)-32444.7 mg Si kg -1 and 105.84-48524.0 mg Si kg -1 in red clayey and sandy soil solutions, respectively during 70 days of incubation. Reduction in soil Eh was accompanied with an increase in the solubility of the soil Si especially for silica gel, electric furnace slag, elephant grass and media of mushroom. Higher exchangeable Ca content in soil tended to suppress Si release from rice straw compost, rice husk-ash and cacao shell-biochar. Considering the results of present study and availability of the materials, we concluded that steel slag of the inorganic materials and rice straw/husk and cacao shell-biochar of organic materials had the highest potential as Si fertilizer source in Indonesia.

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“…According to Kashem and Singh (2001) and Antoniadis, Robinson, and Alloway (2008), the adsorption and desorption of heavy metals has been associated with soil properties including pH, organic matter content, cation exchange capacity (CEC), oxidation-reduction status (Eh), calcium carbonate and Fe and Mn oxides among others. Of these soil properties, soil pH was found to play the most important role in determining metal speciation, solubility, movement and eventual bioavailability due to its strong effects on solubility and speciation of the metals in the soil solution (Zhao, Liu, Xua, & Selim, 2010).…”

Section: Relationship Between Soil Ph and Micronutrient Concentrationmentioning

confidence: 99%

An Assessement of Paddy Production System in Central Kenya with Special Reference to Micronutrients

Kundu¹,

Ishii²,

Sato³

et al. 2017

JAS

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Soil degradation reduces agricultural productivity and poses a great threat on food security status of households. In Kenya, farmers have for a long time been using only nitrogen and phosphorous based fertilizers oblivious of the soil fertility status. In most cases, there has been lack of plant response to these fertilizers, which could be due to a limitation of nutrients other than nitrogen and phosphorous. Soils are considered as variable natural bodies because of combined intrinsic and extrinsic factors of different intensities at a field or a larger region scale therefore an understanding of such variability is imperative to provide insights needed in their management. This study was thus initiated to assess the availability of soil micronutrients from rice growing Vertisols in the Mwea irrigation scheme. Top (0-15 cm) soil samples were collected across paddy fields in the irrigation scheme and analyzed for iron (Fe), zinc (Zn), copper (Cu) and manganese (Mn) by the 0.1 N HCl extraction method. Soil pH (water and 1 M KCl) was also measured using the glass electrode pH meter. Soil solution pH ranged from 4.56 to 8.05 and 3.33 to 6.63 for water and 1 M KCl respectively. Soil Fe, Zn, Cu and Mn concentration varied greatly and ranged from undetected to 1360.6, 0.12 to 8.00, undetected to 9.29 and 1.50 to 849.2 mg/kg respectively. Coefficient of variations (CVs) for soil micronutrients ranged from 64% to 154% indicating very high variability. Soil pH was least variable with CVs 12% and 15% for water and KCl respectively. These results imply that the paddy soils in Mwea region are highly heterogeneous and soil micronutrients are enriched in some areas and depleted in others due to farm management practices and soil properties. Averagely, soil available Zn was deficient across the scheme and as such Zn fertilization can be effective in increasing soil Zn concentration and availability in the soil-root interface further enhancing soil productivity and yield quality. Attention should also be paid to appropriate farm management practices to avoid accumulation or depletion of nutrients.

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Untitled

Cited by 273 publications

References 20 publications

Accumulation of heavy metals from soil in medicinal plants

Accumulation of heavy metals from soil in medicinal plants

Silicon Release from Local Materials in Indonesia under Submerged Condition

An Assessement of Paddy Production System in Central Kenya with Special Reference to Micronutrients

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