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Micronutrient availability in amazonian dark earths and adjacent soils

Sátiro, José Nivaldo de Oliveira, Motta, Antônio Carlos V., Demetrio, Wilian C., Segalla, Rodrigo F., Cremonesi, Marcus Vinicius, Araújo, Eloá Moura, Falcão, Newton Paulo de Souza, Martins, Gilvan C., Muniz, Aleksander W., Taube, Paulo Sérgio, Rebellato, Lilian, de Oliveira Júnior, Raimundo C., Teixeira, Wenceslau G., Neves, Eduardo G., Lima, Helena P., Shock, Myrtle P., Kille, Peter ORCID:, Cunha, Luís ORCID:, TPI Network and Brown, George G. 2021. Micronutrient availability in amazonian dark earths and adjacent soils. Geoderma 395 , 115072. 10.1016/j.geoderma.2021.115072

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Elsevier
ISSN: 0016-7061
Funders: Natural Environment Research Council
Date of First Compliant Deposit: 10 May 2021
Date of Acceptance: 2 March 2021
Last Modified: 04 May 2023 19:08

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