Minimizing the risk to human health due to the ingestion of arsenic and toxic metals in vegetables by the application of biochar, farmyard manure and peat moss

Nawab, Javed; Ghani, Junaid; Khan, Sardar; Wang, Xiaoping

doi:10.1016/j.jenvman.2018.02.093

Cited by 72 publications

(34 citation statements)

References 51 publications

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“…The humic matter and mineral oxides in the biochar and manure mixture could produce heavy metals complex (Meng et al, 2018;Oustriere et al, 2016;Zeng et al, 2015). Moreover, biochar can provide an extra source of energy, microporous space and act as a carrier for microorganisms in manure and soil, thus providing a favorable environment for microbial growth to immobilize heavy metal (Liu et al, 2018;Liu et al, 2020;Nawab et al, 2018;Rehman et al, 2016). In brief, biochar and chicken manure are involved in reducing Pb uptake and improving maize growth and there is an additive effect when they are combined.…”

Section: Discussionmentioning

confidence: 99%

Combined effects of biochar and chicken manure on maize (Zea mays L.) growth, lead uptake and soil enzyme activities under lead stress

Liu

Li²,

Guang-hai

et al. 2021

PeerJ

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The goal of the present work was to evaluate the additive effects of biochar and chicken manure on maize growth in Pb-contaminated soils. In this study, we conducted a pot experiment to investigate how biochar in soil (20, 40 g·kg−1), chicken manure in soil (20, 40 g·kg−1), or a combination of biochar and chicken manure in soil (each at 20 g·kg−1) effect maize growth, Pb uptake, leaves’ antioxidant enzymatic activities, and soil enzyme activities under artificial conditions to simulate moderate soil pollution (800 Pb mg·kg−1). The results showed that all biochar and/or chicken manure treatments significantly (P < 0.05) increased maize plant height, biomass, and superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activity but decreased the malondialdehyde (MDA) content. These results indicated that amending the soil with biochar and/or chicken manure could alleviate Pb’s phytotoxicity. The biochar and/or chicken manure treatments remarkably decreased the Pb concentration in maize roots, stems, leaves, bioconcentration factor (BCF), translocation factor (TF), and available Pb concentration in the soil. Amending the soil with chicken manure alone was more effective at increasing maize growth and antioxidant enzymatic activity; the biochar treatment alone was more effective at inducing soil alkalinization and contributing to Pb immobilization. The combined use of biochar and chicken manure had an additive effect and produced the largest increases in maize growth, leaves’ antioxidant enzymatic activity, and soil enzyme activity. Their combined use also led to the most significant decreases in maize tissues Pb and soil available Pb. These results suggest that a combination of biochar and chicken manure was more effective at reducing soil Pb bioavailability and uptake by maize tissues, and increasing maize growth. This combination increased plant height by 43.23% and dry weight by 69.63% compared to the control.

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Section: Discussionmentioning

confidence: 99%

Combined effects of biochar and chicken manure on maize (Zea mays L.) growth, lead uptake and soil enzyme activities under lead stress

Liu

Li²,

Guang-hai

et al. 2021

PeerJ

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“…In the present study, the significant ( P < 0.001) reduction of heavy metals was reported after remediation with biochar (Table 3). Nawab et al (2018) also reported similar results with higher average reduction of heavy metals in food plants grown on soil amended with biochar (Nawab et al, 2018). Similarly, Houben et al (2013) observed that addition of biochar to heavy metal‐polluted soil reduces the concentration of Pb in vegetables.…”

Section: Resultsmentioning

confidence: 64%

Biochar supplementation regulates growth and heavy metal accumulation in tomato grown in contaminated soils

Álam

Alam

Khan

et al. 2021

Physiologia Plantarum

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Biochar application has recently gained increased attention to reclaim heavy metal degraded soils. In this context, the present study investigated the effects of biochar on the growth regulation and heavy metal accumulation in tomato grown on contaminated soils. A two‐factorial design with factor A including three treatments with mine (contaminated soil) and garden soil in the following ratio viz., T1 = 1:2, T2 = 1:1, and T3 = 2:1, and garden soil only as control; whereas factor B consists of biochar amendments at three levels viz., B1 (3%), B2 (6%), and B3 (9%). Our results revealed significant negative effects of heavy metal‐contaminated soil on plant growth, and besides resulted heavy metal accumulation in tomato fruit. Tomato plants showed maximum reduction of growth in T3 followed by T2, and lowest in T1, a similar pattern was found for accumulation of heavy metals in the fruit. However, the application of biochar reduced the bioavailability and accumulation of heavy metals in the tomato fruit, as well as improved plant growth in contaminated soils. Overall, among the three biochar treatments, B2 was determined as the optimum level for improved growth coupled with reduced heavy metal accumulation in the tomato fruit. Besides, biochar application decreased the daily intake of metals and human health risk index values, thus alleviating the health risk. Hence, the present study demonstrated a positive role of biochar in reclaiming heavy metal‐contaminated soils and in increasing the plant growth.

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“…Gardeners can buy peat moss from garden centers or specialty shops but the price has increased rapidly [18]. Peat land is a source of atmospheric methane (CH4) and a source of carbon (C) in the form of dissolved organic carbon (DOC) [19], [20]. Greater use of peat moss has been shown to damage the environment [21], [22].…”

Section: The Effects Of Watering Rates Using the Drip Irrigation Methods On The Root Mass Growth Of Bird's Nest Ferns 1 Introductionmentioning

confidence: 99%

The Effects of Watering Rates Using the Drip Irrigation Method on the Root Mass Growth of Bird’s Nest Ferns

Pimsuwan¹

2020

GEOMATE

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The increasing demands of gardeners have made peat moss a popular option as a planting material. However, the price of peat moss has increased recently. Therefore, alternative substances for use as a planting material need to be studied. The root of the bird's nest fern offers a cheaper, easier to produce and more readily available source for a planting material than peat moss. The objective of this research was to increase root mass growth by using drip irrigation. With an experimental design using CRD, two-year old bird's nest ferns with root mass sizes of 5 inches were watered by means of a drip irrigation method at rates of 200, 400, 600, 800 and 1,000 ml every 3 days. The data measured were root mass height, root mass diameter, leaf length, leaf width and canopy width. The data were analyzed by ANOVA and the differences between the means of treatment were compared by DMRT. The research found that the ferns which received water at a rate of 800 ml produced a root mass height of 11.06 cm and a root mass diameter of 11.93 cm. They were significantly different (p<0.05). The ferns which received water at a rate of 200 ml produced a leaf length of 29.52cm and a leaf width of 9.55 cm. The amount of water causes fern growth to significantly different (p<0.01). The 800 ml rate of drip irrigation also produced the largest canopy width of 48.12 cm.

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Minimizing the risk to human health due to the ingestion of arsenic and toxic metals in vegetables by the application of biochar, farmyard manure and peat moss

Cited by 72 publications

References 51 publications

Combined effects of biochar and chicken manure on maize (Zea mays L.) growth, lead uptake and soil enzyme activities under lead stress

Combined effects of biochar and chicken manure on maize (Zea mays L.) growth, lead uptake and soil enzyme activities under lead stress

Biochar supplementation regulates growth and heavy metal accumulation in tomato grown in contaminated soils

The Effects of Watering Rates Using the Drip Irrigation Method on the Root Mass Growth of Bird’s Nest Ferns

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