Sana Ullah, Asif Naeem, Marius Praspaliauskas, Irena Vaskeviciene, Ahmed Hosney, Donata Drapanauskaite, Karolina Barcauskaite
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Compost application modulates growth, physiology and metal uptake by Pisum sativum grown in two different pH soils irrigated with contaminated wastewater
Background and aims
Green waste compost (GWC) could alleviate the toxicity of Cu/Zn-contaminated wastewater (WW) to plants, but its differential behaviour in neutral and acidic soils remains unelucidated. Therefore, this pot study evaluated the alleviative effect of GWC on the toxicity of Cu and/ or Zn contaminated wastewater to soil dehydrogenase activity (DHA), growth, physiology and metal accumulation by common pea in acidic and neutral soils.
Methods
The four WW treatments were: uncontaminated WW, Cu-contaminated WW, Zn-contaminated WW, and Cu+Zn-contaminated WW. Thus, there were 16 treatment combinations (4 wastewater- × 2 soils- × 2 compost levels), each having three replicates.
Results
Contaminated WW had statistically similar negative effects on soil DHA, growth and chlorophyll contents of pea plants in both soils. Pea plants accumulated more Cu and Zn in acidic-pH soil than in neutral soil. The ameliorative effect of the GWC amendment was statistically similar in both soils. The GWC improved soil organic matter (30–49%), soil DHA (38–63%), and growth (6–37%) and chlorophyll contents (14%–2-fold) of pea plants as compared to No-Compost. Conversely, the GWC amendment notably and equally decreased Cu and Zn accumulation in pea shoots in both soils. The principal component analysis revealed that Cu concentration and content were negatively related to soil DHA, growth and chlorophyll contents of pea plants.
Conclusion
Hence, it is concluded that Zn is less toxic than Cu, and compost can be used as soil conditioner in acidic as well as neutral soil to reduce the metal uptake and their concentration in pea shoots.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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