Contrasting effects of biochar, compost and farm manure on alleviation of nickel toxicity in maize (Zea mays L.) in relation to plant growth, photosynthesis and metal uptake

Date

2016-11-01

Author

Rehman, Muhammad Zia-Ur
Rizwan, Muhammad
Ali, Shafaqat
Fatima, Nida
Yousaf, Balal
Naeem, Asif
Sabir, Muhammad
Ahmad, Hamaad Raza
Ok, Yong Sik

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Nickel (Ni) toxicity in agricultural crops is a widespread problem while little is known about the role of biochar (BC) and other organic amendments like farm manure (FM) from cattle farm and compost (Cmp) on its alleviation. A greenhouse experiment was conducted to evaluate the effects of BC, Cmp and FM on physiological and biochemical characteristics of maize (Zea mays L.) under Ni stress. Maize was grown in Ni spiked soil without and with two rates of the amendments (equivalent to 1% and 2% organic carbon, OC) applied separately to the soil After harvest, plant height, root length, dry weight, chlorophyll contents, gas exchange characteristics and trace elements in plants were determined. In addition, post-harvest soil characteristics like pH(s), ECe and bioavailable Ni were also determined. Compared to the control, all of the amendments increased plant height, root length, shoot and root dry weight with the maximum increase in all parameters by FM (2% OC) treatment. Similarly, total chlorophyll contents and gas exchange characteristics significantly increased with the application of amendments being maximum with FM (2% OC) application. Amendments significantly increased copper, zinc, manganese and iron concentrations and decreased Ni concentrations in the plants. The highest reduction in shoot Ni concentration was recorded with FM (2% OC) followed by BC (2% OC) being 73.2% and 61.1% lower compared to the control, respectively. The maximum increase in soil pH and decrease in AB-DTPA extractable Ni was recorded with BC (2% OC) followed by FM (2% OC). It is concluded that FM (2% OC) was the most effective in reducing Ni toxicity to plants by reducing Ni uptake while BC (2% OC) was the most effective in decreasing bioavailable Ni in the soil through increasing soil pH. However, long-term field studies are needed to evaluate the effects of these amendments in reducing Ni toxicity in plants. (C) 2016 Elsevier Inc. All rights reserved.

URI

https://hdl.handle.net/11511/89987

Journal

ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

DOI

https://doi.org/10.1016/j.ecoenv.2016.07.023

Collections

Department of Environmental Engineering, Article

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Citation Formats

M. Z.-U. Rehman et al., “Contrasting effects of biochar, compost and farm manure on alleviation of nickel toxicity in maize (Zea mays L.) in relation to plant growth, photosynthesis and metal uptake,” ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, pp. 218–225, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/89987.