132 results

Soil physical properties and interrill erosion in agricultural production systems after 20 years of cultivation

Dorly Scariot Pavei ORCID logo , Elói Panachuki ORCID logo , Júlio Cesar Salton ORCID logo , Jullian Souza Sone ORCID logo , Teodorico Alves Sobrinho ORCID logo , Wander Cardoso Valim ORCID logo , [...]

05/nov/2021

ABSTRACT Agricultural management significantly influences soil physical properties and soil erosion. However, there are few studies investigating the long-term effects of agricultural management on soil erosion and physical properties. Here, we assessed the impacts of 20-year agricultural land uses under different management practices on soil physical properties and interrill erosion. This study was conducted on an experimental farm of the Embrapa Western Agriculture, Brazil, and the treatments consisted of soybean cropping under conventional tillage (CT) and no-tillage (NT), crop-livestock integration […]

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Forest harvest management systems and residual phytomass affecting physical properties of a sandy soil

Karla Nascimento Sena ORCID logo , Kátia Luciene Maltoni ORCID logo , Maria Júlia Betiolo Troleis ORCID logo , Glaucia Amorim Faria ORCID logo

05/nov/2021

ABSTRACT Organic carbon introduced in soils, mainly through organic matter, has a relevant role in various soil properties and is particularly important in sandy soils. In these soils, the input of organic material is necessary to ensure the sustainability of production systems. This study aimed to investigate the changes in total organic carbon content and its effect on physical properties in areas under different harvest management systems (HMS) after the harvest of eucalyptus. The study was performed in December 2017 […]

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Assessing sediment yield and streamflow with SWAT model in a small sub-basin of the Cantareira System

Lucas Machado Pontes ORCID logo , Pedro Velloso Gomes Batista ORCID logo , Bárbara Pereira Christofaro Silva ORCID logo , Marcelo Ribeiro Viola ORCID logo , Humberto Ribeiro da Rocha ORCID logo , Marx Leandro Naves Silva ORCID logo

05/out/2021

ABSTRACT Hydro-sedimentological models might be useful tools for investigating the effectiveness of soil and water conservation practices. However, evaluating the usefulness of such models requires that predictions are tested against observational data and that uncertainty from model parameterization is addressed. Here we aimed to evaluate the capacity of the SWAT model to simulate monthly streamflow and sediment load in the Posses creek catchment (12 km2), Southeast Brazil. The SUFI-2 algorithm from SWAT-CUP was applied for calibration, testing, uncertainty, and sensitivity […]

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Geotechnical properties of some kaolinite-rich Brazilian Vertisols

Gustavo Magalhães Nunes Barbosa ORCID logo , Eduardo Antonio Gomes Marques ORCID logo , João Carlos Ker ORCID logo , Igor Rodrigues de Assis ORCID logo , Tony Jarbas Ferreira Cunha ORCID logo , Luciano da Silva Souza ORCID logo

05/out/2021

Abstract Vertisols presenting kaolinite codominance or prevalence were already reported in several countries worldwide. However, the literature has few studies focused on investigating the influence of this clay mineral in soil geotechnical behavior. This study aimed to carry out the characterization of Vertisols in Bahia State, Brazil, to understand the influence of physical, chemical, and mineralogical properties on their geotechnical behavior, as these soils have high natural fertility and have been used for agricultural activity, but with great risk due […]

On-farm evaluation of regenerative land-use practices in a semi-arid pasture agroecosystem in West Texas, USA

Lindsey Slaughter ORCID logo , Sanjit Deb ORCID logo , Somsubhra Chakraborty ORCID logo , Bin Li ORCID logo , Noura Bakr ORCID logo , Bryanna Edwards ORCID logo , [...]

02/jun/2021

ABSTRACT Continually rising scarcity in water and nutrient resources, especially in semi-arid agricultural systems, combined with increased frequency of extreme weather events such as drought, contribute to a growing need for resilient and regenerative agricultural ecosystems. However, evaluating a myriad of combinations of producer-led sustainable management practices in on-farm research remains challenging. Few studies have elucidated spatial variability in measured soil properties across the study area due to logistical and economic constraints. As such, this study aimed to: 1) establish […]

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Is cassava yield affected by inverting tillage, chiseling or additional compaction of no-till sandy-loam soil?

José Miguel Reichert ORCID logo , Eracilda Fontanela ORCID logo , Gabriel Oladele Awe ORCID logo , Johnson Toyin Fasinmirin ORCID logo

02/jun/2021

ABSTRACT Defining a suitable soil tillage option that provides adequate soil physical conditions for optimum cassava (Manihot esculenta Crantz) productivity has not been adequately researched in southern Brazil. This study aimed to evaluate, in an Argissolo Vermelho-Amarelo Distrófico (Acrisol or Hapludalf), three tillage methods – conventional (inverting) tillage, chiseling, and long-term no-tillage (without and with, additional soil compaction), as affecting soil hydro-physical properties and cassava yield, in southern Brazil. Undisturbed and disturbed soil samples were collected from row and interrow […]

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Physicogenic and biogenic aggregates under different management systems in the Cerrado region, Brazil

Luiz Alberto da Silva Rodrigues Pinto ORCID logo , José Luiz Rodrigues Torres ORCID logo , Igor de Sousa Morais ORCID logo , Robert Ferreira ORCID logo , Wanderson Farias da Silva Júnior ORCID logo , Sandra de Santana Lima ORCID logo , [...]

23/abr/2021

ABSTRACT An important strategy for the sustainable management of Cerrado soils is no-till (NT) systems, which may improve soil properties, particularly aggregation. Soil aggregates can be categorized according to their formation pathways into physicogenic (Phy) and biogenic (Bio). This study aimed (i) to quantify the relative proportion of physicogenic and biogenic aggregates and (ii) evaluate the levels of total organic carbon and their respective humic and physical fractions in the aggregates’ formation pathways. The following managed and unmanaged sites were […]

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Sediment source and volume of soil erosion in a gully system using UAV photogrammetry

Bernardo Moreira Cândido ORCID logo , Mike James ORCID logo , John Quinton ORCID logo , Wellington de Lima ORCID logo , Marx Leandro Naves Silva ORCID logo

11/nov/2020

ABSTRACT Gully erosion is a severe way of land degradation. Gullies threaten the sustainability of agro-ecosystems, causing quantitative and qualitative reduction of groundwater, farmland productivity, and waterways sedimentation. Since the gully development on the surface begins with water flow and sheet erosion, accurate monitoring of the erosive processes in a gully system and its quantification is key for the development of effective strategies to control soil erosion in gullies. Here, we demonstrate the first use of unmanned aerial vehicle (UAV) […]

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Developing scoring functions to assess soil quality at a regional scale in rangelands of SW Spain

Manuel Pulido Fernández ORCID logo , Ali Keshavarzi ORCID logo , Jesús Rodrigo-Comino ORCID logo , Susanne Schnabel ORCID logo , Joaquín Francisco Lavado Contador ORCID logo , Álvaro Gómez Gutiérrez ORCID logo , [...]

06/nov/2020

ABSTRACT The drawing of maps of soil quality at a large scale is increasingly being more useful to land planners and stakeholders. Nevertheless, it involves different methodological steps from the description of soil profiles in the field until the regional mapping of integrative soil quality index (IQI) values. The development of proper scoring functions is a paramount task for the calculation of these IQI values since every parameter needs to be standardized accordingly and weighting factors are usually estimated by […]

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Hydrosedimentological modeling in a headwater basin in Southeast Brazil

Eliete Nazaré Eduardo Mauri ORCID logo , Marcelo Ribeiro Viola ORCID logo , Lloyd Darrell Norton ORCID logo , Phillip Ray Owens ORCID logo , Carlos Rogério de Mello ORCID logo , Leandro Campos Pinto ORCID logo , [...]

23/out/2020

ABSTRACT Hydrosedimentological modeling is a useful tool to predict the water dynamic in a basin and for water resources management. This study aimed to i) evaluate the ability of Soil and Water Assessment Tool (SWAT) to model sediment load and continuous monthly streamflow in the Mortes River Basin (MRB) in Southeastern Brazil; ii) estimate the sediment yield spatially distributed by sub-basins; iii) estimate the sediment load export to the Funil Hydroelectric Power Plant reservoir (FHPP), located in the MRB outlet. […]

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