Jack beans and vetiver grass growth on iron ore tailing sediments from the Doce River dam disaster in Brazil: plant grow
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SEDIMENTS, SEC 4 • SEDIMENT-ECOLOGY INTERACTIONS • RESEARCH ARTICLE
Jack beans and vetiver grass growth on iron ore tailing sediments from the Doce River dam disaster in Brazil: plant growth regulator effects under different edaphic conditions Pedro Henrique Lopes Santana 1 & Diego Lang Burak 1 Mirna Aparecida Neves 3 & Eduardo de Sá Mendonça 1
&
Cássio Carlette Thiengo 1 & Anderson Lopes Peçanha 2 &
Received: 12 June 2019 / Accepted: 3 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose After the greatest environmental disaster in the history of Brazil and the deposition of the iron ore tailings in alluvial regions, the process of revegetation for environmental recovery becomes essential. A greenhouse experiment was carried out to evaluate the biomass production and nutrient accumulation by jack bean (Canavalia ensiformis (L.) DC) and vetiver grass (Chrysopogon zizanioides (L.) Roberty) grown on iron ore tailings from alluvial regions under two edaphic conditions using plant growth regulators. Materials and methods Iron ore tailings were obtained for use as the substrate. Jack bean and vetiver plants were grown in two conditions, high water and nutrient availability and low water and nutrient availability, while using four doses (0, 0.25, 0.5, and 0.75 L ha−1) of plant growth regulators (kinetins, gibberellic acid, and indole-butyric acid) via leaf spray. Results and discussion The use of plant growth regulators increased the biomass production (74 and 30% of total dry mass in jack bean and vetiver grass, respectively) and the accumulation of nutrients in the shoot parts of the plants cultivated with greater water and nutritional availability. Under limiting conditions of water and nutritional availability, the jack bean with the highest dose of plant growth regulator had a greater potential for revegetation, biomass production, and inputs of nitrogen, while vetiver grass had a greater contribution in potassium bio-cycling in the areas affected by the tailings deposited in the alluvial regions of the Doce River. Conclusions The performance of the jack bean stood out in the two edaphic conditions due to growth stimulations by plant growth regulators. Keywords Revegetation . Plant hormones . Nutrient stress . Water stress . Biochemical cycling of nutrients
1 Introduction Responsible Editor: Patrick Byrne * Diego Lang Burak [email protected] 1
Department of Agronomy, Federal University of Espírito Santo, Alegre 29500-000, Brazil
2
Department of Biology, Center of Agricultural Sciences and Engineers, Federal University of Espírito Santo, Alegre 29500-000, Brazil
3
Department of Geology, Center for Exact, Natural and Health Sciences, Federal University of Espírito Santo, Alegre 29500-000, Brazil
The worst environmental disaster that occurred in Brazil, with the disruption of the Fundão and Santarém dams, caused incalculable impacts on the environment and the populations dependent on the Doce River. Approximately 60 million m3 of tailings from the treatment of iron
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