Micronutrient availability in amazonian dark earths and adjacent soils

José Nivaldo De Oliveira Sátiro, Antônio Carlos V. Motta, Wilian C. Demetrio, Rodrigo F. Segalla, Marcus Vinicius Cremonesi, Eloá Moura Araújo, Newton Paulo De Souza Falcão, Gilvan C. Martins, Aleksander W. Muniz, Paulo Sérgio Taube, Lilian Rebellato, Raimundo C. De Oliveira Júnior, Wenceslau G. Teixeira, Eduardo G. Neves, Helena P. Lima, Myrtle P. Shock, Peter Kille, Luís Cunha, TPI Network, George G. Brown

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    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 in-formation 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
    Original languageEnglish
    Article number115072
    Number of pages11
    JournalGeoderma
    Volume395
    Early online date30 Mar 2021
    DOIs
    Publication statusPublished - 1 Aug 2021

    Keywords

    • Anthropic activity
    • ADE
    • Trace elements
    • Fertility
    • Terra Petra

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