Mineral nitrogen dynamics, mineralization and nitrification in soybean fields under No-Tillage and conventional tillage in Amazonian tropical soils.

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dc.contributorNIELI ELOINE RODDRIGUES, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; DARLISSON BENTES SANTOS; DANIEL ROCHA OLIVEIRA, AGÊNCIA DE DEFESA AGROPECUÁRIA DO ESTADO DO PARÁ.
dc.creatorRODDRIGUES, N. E.
dc.creatorOLIVEIRA JUNIOR, R. C. de
dc.creatorSANTOS, D. B.
dc.creatorOLIVEIRA, D. R.
dc.date2026-03-18T17:29:42Z
dc.date2026-03-18T17:29:42Z
dc.date2026-03-18
dc.date2026
dc.date.accessioned2026-06-30T23:55:03Z
dc.descriptionThis study evaluated mineral nitrogen (NH₄⁺ and NO₃⁻) concentrations and potential mineralization and nitrification rates in soils under No-Tillage (NT) and Conventional Tillage (CT) in soybean fields in the Santarém Plateau, Pará, Brazil. Soil samples were collected at three phenological stages (R1: flowering; R5: grain filling; R8: physiological maturity) and four depths (0 – 10, 10 – 20, 20 – 30, 30 – 40 cm). No significant differences were observed between NT and CT for mineral N concentrations or transformation rates, suggesting that after two years of NT adoption, short-term effects on N dynamics are minimal. Mineral N concentrations decreased significantly (p< 0.05) from R1 to R8, mainly in deeper layers (10 – 40 cm), likely due to intense N uptake by soybean during early reproductive stages. The highest daily mineralization and nitrification rates occurred in the 0 – 10 cm layer, associated with greater organic matter and microbial activity. Positive transformation rates at all depths indicate continuous conversion of organic N into plant-available forms throughout the crop cycle. Results suggest that NT benefits on soil N cycling in Amazonian agricultural systems may become more evident over longer adoption periods, particularly when integrated with crop rotation and permanent soil cover.
dc.identifierAmbiente e Água: An Interdisciplinary Journal of Applied Science, v. 21, e3115, 2026.
dc.identifier1980-993X.
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1185575
dc.identifierhttps://doi.org/10.4136/ambi-agua.3115
dc.identifier.urihttp://hdl.handle.net/123456789/393188
dc.languagepor
dc.rightsopenAccess
dc.subjectCiclagem
dc.subjectAgricultura tropical
dc.subjectAmônio
dc.subjectSistemas de manejo agrícola
dc.subjectNitrato
dc.titleMineral nitrogen dynamics, mineralization and nitrification in soybean fields under No-Tillage and conventional tillage in Amazonian tropical soils.
dc.typeArtigo de periódico

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