3296 results

Critical levels and fertility classes of soils with high-activity clay in the Brazilian semi-arid region

Henrique Antunes de Souza ORCID logo , Antonio João de Lima Neto ORCID logo , Roberto Cláudio Fernandes Franco Pompeu ORCID logo , Fernando Lisboa Guedes ORCID logo , Rafael Gonçalves Tonucci ORCID logo , Ana Clara Rodrigues Cavalcante ORCID logo , [...]

04/Nov/2024

ABSTRACT Soil fertility evaluation is important for adopting conservation management and adequate nutrient supply. The objective of this study was to identify critical levels and soil fertility classes using the boundary line method for rainfed crops (corn, cowpea and sabiá [Mimosa caesalpiniifolia]) in the Brazilian semi-arid region. A database of 226 soil fertility analyses of samples from the 0.00-0.20 m soil layer, and corn, cowpea and sabiá yields from Ceará State was used to generate interpretation classes (at 80 and […]

Visual Abstract

Drill cuttings from oil exploration improve properties of substrate and growth of Ipê-branco (Tabebuia roseoalba) seedlings

Victória Maria Monteiro Mendonça ORCID logo , Dione Richer Momolli ORCID logo , Alan Henrique Marques de Abreu ORCID logo , Júlio César Ribeiro ORCID logo , Marcos Vinicius Winckler Caldeira ORCID logo , Jorge Makhlouta Alonso ORCID logo , [...]

23/Oct/2024

ABSTRACT More information is needed on the potential of using drill cuttings (crushed rocks) from the oil industry in agriculture and forestry. An experiment in forest nursery was carried out to evaluate the influence of substrates formulated from onshore gravel on characteristics of Ipê-branco (Tabebuia roseoalba) seedlings (i.e., growth, quality, and nutrition). We used five gravimetric proportions of gravel from drill cuttings mixed with Pinus-bark – commercial substrate (Mecplant® Florestal 3): control with only commercial substrate and zero gravel (G0), […]

Visual Abstract

Chemical and mineralogical constitution of redoximorphic features and mechanism of formation of Plinthosols from the Araguaia River plain, Brazil

Djavan Pinheiro Santos ORCID logo , Glenio Guimarães Santos ORCID logo , Virlei Álvaro de Oliveira ORCID logo , Gustavo Cassiano da Silva ORCID logo , Rilner Alves Flores ORCID logo , Antônio Carlos Azevedo ORCID logo , [...]

11/Oct/2024

ABSTRACT Currently in Brazil, large grain cultivation projects on Plinthosols are a reality, however, there is little or no knowledge of the real mechanism of formation of the plinthite feature, in addition to what is reported in the literature as being a product of oxidation-reduction processes of iron element. This study evaluates iron redoximorphic features and investigates their chemical and mineralogical composition in two profiles of Plinthosols from the Araguaia River plain (P1 and P2). The study strengthens the understanding […]

Visual Abstract

Potassium distribution in soil profiles under no-tillage system

Deonilce Retka Artuso ORCID logo , Diovane Freire Moterle ORCID logo , Danilo Rheinheimer dos Santos ORCID logo , Tales Tiecher ORCID logo

11/Oct/2024

ABSTRACT Potassium (K) vertical mobility in soils has often been overestimated and used as a rationale for recommending the broadcast application of this nutrient in fertility management programs, especially in soils with low cation exchange capacity (CEC). This study aimed to evaluate the vertical distribution of K in two land uses: areas with natural vegetation and crop fields managed under no-tillage (NT) fertilized with K. For this purpose, 49 soil profiles from the Brazilian subtropical state of Rio Grande do […]

Visual Abstract

Sediment source tracing in a Brazilian subtropical catchment using diffuse reflectance: Effect of spectral ranges, pre-processing techniques, and multivariate model

Rafael Ramon ORCID logo , Olivier Evrard ORCID logo , Jean Paolo Gomes Minella ORCID logo , Cláudia Alessandra Peixoto de Barros ORCID logo , Jean Michel Moura-Bueno ORCID logo , Gabriela Naibo ORCID logo , [...]

11/Oct/2024

ABSTRACT Agriculture intensification in Southern Brazil’s subtropical regions combined with the frequent occurrence of erosive rainfall has rendered the area a global water erosion hotspot. In this scenario, understanding and regulating erosion processes at the river catchment scale is critical for mitigating soil and water resource degradation. Traditional methods for tracing sediment sources are expensive and time-consuming and justify the development of alternative approaches. Therefore, in this study, we employed diffuse reflectance spectroscopy analyses in the ultraviolet-visible (UV-VIS), near-infrared (NIR), […]

Visual Abstract

Impact of a forage legume or nitrogen fertilizer application on ammonia volatilization and nitrous oxide emissions in Brachiaria pastures

Rafael Cassador Monteiro ORCID logo , Camila Almeida dos Santos ORCID logo , Claudia de Paula Rezende ORCID logo , José Marques Pereira ORCID logo , Robert de Oliveira Macedo ORCID logo , Bruno José Rodrigues Alves ORCID logo , [...]

11/Oct/2024

ABSTRACT The largest proportion of greenhouse gas (GHG) emissions in the Agriculture sector of the Brazilian national GHG inventory is derived from the large (>200 million head) herd of cattle. The greatest contribution to these emissions comes from the enteric methane from cattle, but the direct and indirect emissions of nitrous oxide (N2O) from cattle excreta and N fertilizer are responsible for approximately 9 % of all national anthropogenic GHG emissions. Ammonia (NH3) can be volatilized from N fertilizer and […]

Visual Abstract

Use and recovery of P reserves in Southern Brazil Oxisols under no-till with low and high P availability

Magno Batista Amorim ORCID logo , Sandra Mara Vieira Fontoura, Tales Tiecher ORCID logo , Renato Paulo de Moraes, Cimelio Bayer ORCID logo

10/Sep/2024

ABSTRACT The accessibility of soil P reserves by plants on highly weathered Brazilian soils remains unclear. In this study, we assessed the contribution of soil P fractions to P uptake by soybean plants in two no-till Oxisols (Latossolos), with low and high initial content of available P. The recommended P rates (viz., 153 and 50 kg ha-1 yr-1 in the low-P and high-P soil, respectively) were applied in the form of triple superphosphate (TSP) or Bayovar rock phosphate (BRP) plus […]

Visual Abstract

Chemical and spectroscopic composition of humic substances in soil subjected to pig manure applications for ten years

Lucas Benedet ORCID logo , Andria Paula Lima ORCID logo , Taís Morais Barbosa ORCID logo , Guilherme Wilbert Ferreira ORCID logo , Deborah Pinheiro Dick ORCID logo , Cledimar Rogério Lourenzi ORCID logo , [...]

27/Aug/2024

ABSTRACT Application of pig manure (PM) in agriculture can influence the amount and composition of soil organic matter (SOM). This study evaluated the changes in contents and stock of C in chemical fractions of SOM and the chemical and spectroscopic composition of humic substances (HS) in a Typic Hapludult (Argissolo Vermelho-Amarelo) after ten years of PM application. Experimental area received 90 and 180 kg ha-1 of N in the form of pig slurry (PS90 and PS180) and pig deep litter […]

Visual Abstract

Soil carbon prediction in Marajó island wetlands

David Lukas de Arruda ORCID logo , João Carlos Ker ORCID logo , Gustavo Vieira Veloso ORCID logo , Renata Jordan Henriques ORCID logo , Elpídio Inácio Fernandes-Filho ORCID logo , Danilo de Lima Camêlo ORCID logo , [...]

27/Aug/2024

ABSTRACT Soil is an important carbon repository in terrestrial ecosystems, serving a fundamental role in the intricate cycling of this elemental component. Wetlands are crucial components of the global carbon cycle, playing a significant role in carbon sequestration due to their remarkable productivity and unique sedimentary structures. Our study focuses on the wetlands east of Marajó island, recognized as the largest fluvial-marine plain in South America. In this study, we applied a methodological framework to optimize SOC content prediction in […]

Visual Abstract

Bone char: characterization and agronomic application as an alternative source of phosphorus

Gustavo Franco de Castro ORCID logo , Valber Georgio de Oliveira Duarte ORCID logo , Fabiane Carvalho Ballotin ORCID logo , Brunno Cesar Pereira Rocha ORCID logo , Igor Franco Rezende ORCID logo , Edson Marcio Mattiello ORCID logo , [...]

27/Aug/2024

ABSTRACT Alternative materials can be used to reduce reliance on mining for P-based fertilizers. In this sense, the pyrolysis process of bovine bones produces the “bone char”, which can be used as a source of P. This study aimed to characterize bone char and conduct a comparative analysis with both soluble (triple superphosphate) and non-soluble (Bayóvar phosphate rock) phosphate fertilizers, specifically examining its behavior in soil and uptake by plants. Bone char characterization was performed by X-ray diffraction (XRD), attenuated […]

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