15 documents found, page 1 of 2
Temporal and Spatial Uncertainty of Erosion Soil Loss from an Argisol Under Sug...
Mendonça,Patrícia Gabarra; Teixeira,Daniel De Bortoli; Moitinho,Mara Regina; Silva Junior,João Fernandes da; Oliveira,Ismênia Ribeiro deABSTRACT The identification of erosion-susceptible areas is fundamental for the adoption of soil conservation practices. Thus, the best way to estimate the spatial pattern of soil erosion must be identified, in which the process uncertainties are also taken into consideration. The purpose of this study was to evaluate the spatial and temporal uncertainty of soil loss under two scenarios of sugarcane harvest man...
Magnetic susceptibility for characterizing areas with different potentials for ...
Siqueira,Diego Silva; Marques Júnior,José; Teixeira,Daniel De Bortoli; Matias,Sammy Sidney Rocha; Camargo,Livia Arantes; Pereira,Gener TadeuAbstract The objective of this work was to evaluate the use of magnetic susceptibility for characterizing the spatial variability of soil attributes and identifying areas with different potentials for sugarcane (Saccharum spp.) production. Samples were collected at 110 points (1 per 7 ha) in the layers of 0.00-0.20 and 0.20-0.40 m, to determine the magnetic susceptibility and physical and chemical attributes of...
USE OF SCALED SEMIVARIOGRAMS IN THE PLANNING SAMPLE OF SOIL PHYSICAL PROPERTIES...
Aquino,Renato Eleotério de; Campos,Milton César Costa; Marques Junior,José; Oliveira,Ivanildo Amorim de; Teixeira,Daniel De BortoliThere is a great lack of information from soil surveys in the southern part of the State of Amazonas, Brazil. The use of tools such as geostatistics may improve environmental planning, use and management. In this study, we aimed to use scaled semivariograms in sample design of soil physical properties of some environments in Amazonas. We selected five areas located in the south of the state of Amazonas, Brazil,...
SPATIAL UNCERTAINTY OF NUTRIENT LOSS BY EROSION IN SUGARCANE HARVESTING SCENARIOS
Mendonça,Patrícia Gabarra; Silva Júnior,João Fernandes da; Oliveira,Ismênia Ribeiro de; Teixeira,Daniel De Bortoli; Moitinho,Mara ReginaThe assessment of spatial uncertainty in the prediction of nutrient losses by erosion associated with landscape models is an important tool for soil conservation planning. The purpose of this study was to evaluate the spatial and local uncertainty in predicting depletion rates of soil nutrients (P, K, Ca, and Mg) by soil erosion from green and burnt sugarcane harvesting scenarios, using sequential Gaussian simu...
Field-scale spatial correlation between contents of iron oxides and CO2 emissio...
Bahia,Angélica Santos Rabelo de Souza; Marques Júnior,José; Panosso,Alan Rodrigo; Camargo,Livia Arantes; Siqueira,Diego SilvaSoil CO2 emission (FCO2) is one of the main sources of carbon release into the atmosphere. Moreover, FCO2 is related to soil attributes governing the transfer of gases from soil to the atmosphere. This study aimed firstly to describe the spatial variability of hematite (Hm), goethite (Gt), iron extracted with sodium dithionite-citrate-bicarbonate (Fed) contents, soil CO2 emission (FCO2) and free-water porosity ...
Characterization of potential CO2 emissions in agricultural areas using magneti...
Leal,Fábio Tiraboschi; França,Ana Beatriz Coelho; Siqueira,Diego Silva; Teixeira,Daniel De Bortoli; Marques Júnior,José; Scala Júnior,Newton LaABSTRACTSoil CO2 emissions (fCO2) in agricultural areas have been widely studied in global climate change research, but its characterization and quantification are restricted to small areas. Because spatial and time variability affect emissions, tools need to be developed to predict fCO2 for large areas. This study aimed to investigate soil magnetic susceptibility (MS) and its correlation with fCO2 in an agricu...
Variabilidade espacial de atributos de solos coesos do leste maranhense
Resende,José Maria do Amaral; Marques Júnior,José; Martins Filho,Marcilio Vieira; Dantas,Jussara Silva; Siqueira,Diego Silva; Teixeira,Daniel De BortoliA demanda nacional e internacional por mapas de atributos do solo tem aumentado. Os objetivos deste trabalho foram caracterizar e associar a variabilidade da granulometria, os atributos químicos e a cor de solos coesos a diferentes formas de paisagem, em áreas agrícolas e de vegetação nativa, por meio de técnicas geoestatísticas. Para a instalação do experimento, foram escolhidas três áreas representadas por um...
Iron oxides and quality of organic matter in sugarcane harvesting systems
Barbieri,Diogo Mazza; Marques Júnior,José; Siqueira,Diego Silva; Teixeira,Daniel De Bortoli; Panosso,Alan Rodrigo; Pereira,Gener TadeuImprovements in working conditions, sustainable production, and competitiveness have led to substantial changes in sugarcane harvesting systems. Such changes have altered a number of soil properties, including iron oxides and organic matter, as well as some chemical properties, such as the maximum P adsorption capacity of the soil. The aim of this study was to characterize the relationship between iron oxides a...
Coeficiente de erodibilidade em sulcos e entressulcosde Argissolos coesos estim...
Dantas,Jussara Silva; Filho,Marcílio Vieira Martins; Júnior,José Marques; Resende,José Maria do Amaral; Teixeira,Daniel De BortoliO objetivo deste trabalho foi estimar o coeficiente de erodibilidade em sulcos e entressulcos, por meio de parâmetros da cor do solo. Foram selecionadas três áreas cultivadas com soja, em Argissolos Amarelos coesos do Leste Maranhense. Em cada área, foram retiradas 121 amostras na profundidade de 0,00-0,20 m. Foram determinados os valores de espectroscopia de reflectância difusa na faixa do visível, para obtenç...
Modelagem e quantificação da incerteza espacial do potássio disponível no solo ...
Oliveira,Ismênia Ribeiro de; Teixeira,Daniel De Bortoli; Panosso,Alan Rodrigo; Júnior,José Marques; Pereira,Gener TadeuO objetivo deste trabalho foi avaliar o desempenho da simulação sequencial gaussiana (SSG) e da simulação sequencial indicatriz (SSI) na modelagem da incerteza das predições do K disponível em área de cana-de-açúcar, e comparar as simulações com o método já consagrado de krigagem ordinária (KO). Uma malha amostral com 626 pontos foi instalada em área de 200 ha, no Município de Tabapuã, em São Paulo. As simulaçõ...