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Title: Micronutrient availability in amazonian dark earths and adjacent soils
Authors: Sátiro, José Nivaldo De Oliveira
Motta, Antônio Carlos Vargas
Demetrio, Wilian Carlo
Segalla, Rodrigo F.
Cremonesi, Marcus Vinicius
Araújo, Eloá Moura
Falcão, Newton P.S.
Martins, Gilvan Coimbra
Muniz, Aleksander Westphal
Taube, Paulo Sérgio
Rebellato, Lilian
Oliveira Júnior, Raimundo Cosme de
Teixeira, Wenceslau Geraldes
Neves, Eduardo Goés
Lima, Helena Pinto
Shock, Myrtle Pearl
Kille, Peter
Cunha, Luis
Brown, George G.
Network, Tpi
Keywords: ADE
Anthropic activity
Terra Preta
Trace elements
Issue Date: 2021
metadata.dc.publisher.journal: Geoderma
metadata.dc.relation.ispartof: Volume 395; number 115072
Abstract: Amazonian Dark Earths (ADEs) are highly fertile soils in areas with predominance of unfertile soils. However, the variation in nutrient availability between regions and the resilience of ADEs to modern agricultural use is still little known, particularly regarding micronutrient contents. Hence, the present study synthesized current information of ADE impacts on extractable micronutrient (Cu, Ni, Fe, Mn, Zn, B) contents at different soil depths and assessed in detail the role of both soil depth and land-use type on extractable Cu, Ni, Fe, Mn and Zn in nine ADEs and adjacent (ADJ) soils from different Amazonian regions. The land-use systems chosen were secondary old (OF) or young (YF) forests, and agricultural systems (AS) in Iranduba, Belterra and Porto Velho. Only eight studies compared extractable (Mehlich-1) micronutrient contents at 21 sites with ADEs and ADJ soils, but only four studies included depths greater than 30 cm, and B and Ni were evaluated in only one study. Higher Mn and Zn, but lower Fe contents were found in ADEs both from literature data and in the present study, especially in the first 30 cm depth. Increases in extractable Ni and Cu in ADEs varied according to the site and the land use considered. Micronutrient contents tended to decrease with depth, but varied depending on the element, site, soil type and land use. Sites with modern agriculture showed few differences in extractable micronutrient contents, except for a decrease in Fe in Belterra and Mn in Porto Velho. Considering the high amounts of some micro- and macronutrients in ADEs further work is warranted concerning soil management and nutrient balance in plants grown on these soils. © 2021 The Authors
metadata.dc.identifier.doi: 10.1016/j.geoderma.2021.115072
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