Consulta: subjectFacets:"Oxisol"
Registros recuperados: 32
Data/hora: 10/06/2024 10:07:23

Terrain forms and spatial variability of soil properties in an area cultivatedwith citrus
Provedor de dados: 70
Autores: Leão,Marisol G. A. de; Marques Júnior,José; Souza,Zigomar M. de; Siqueira,Diego S.; Pereira,Gener T.
The technique of precision agriculture and soil-landscape allows delimiting areas for localized management, allowing a localized application of agricultural inputs and thereby may contribute to preservation of natural resources. Therefore, the objective of this work was to characterize the spatial variability of chemical properties and clay content in the context of soil-landscape relationship in a Latosol (Oxisol) under cultivation of citrus. Soil samples were collected at a depth of 0.0-0.2 m in an area of 83.5 ha planted with citrus, as a 50-m intervals grid, with 129 points in concave terrain and 206 points in flat terrain, totaling 335 points. Values for the variables that express the chemical characteristics and clay content of soil properties were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Management zone; Oxisol; Orange.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000400003

Magnetic susceptibility in the prediction of soil attributes in two sugarcane harvesting management systems
Provedor de dados: 70
Autores: Peluco,Rafael G.; Marques Júnior,José; Siqueira,Diego S.; Cortez,Lucas A.; Pereira,Gener T.
This study aimed to investigate the potential use of magnetic susceptibility (MS) as pedotransfer function to predict soil attributes under two sugarcane harvesting management systems. For each area of 1 ha (one with green sugarcane mechanized harvesting and other one with burnt sugarcane manual harvesting), 126 soil samples were collected and subjected to laboratory analysis to determine soil physical, chemical and mineralogical attributes and for measuring of MS. Data were submitted to descriptive statistics by calculating the mean and coefficient of variation. In order to compare the means in the different harvesting management systems it was carried out the Tukey test at a significance level of 5%. In order to investigate the correlation of the MS with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedotransfer; Indirect quantification; Oxisol.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600006

Classification, characterization and utilization of oxisols: proceedings.
Provedor de dados: 14
Autores: INTERNATIONAL SOIL CLASSIFICATION WORKSHOP, 8., 1986, Rio de Janeiro.
Part 1: Papers: Perspectives and Background; Implications of the ICOMOX proposal; Properties of Oxisols; Oxisols of different regions; Agronomic and engineering aspects of Oxisols. Part 2: Field Trip Background, Site and Pedon Descriptions, Analytical Data: Physical environment of excursion area; Explanation pertaining to data section; Site and soil descriptions and analytical data.
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Solo; Classificação do solo; Oxisol; Soil classification.
Ano: 1988
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/327221

Aptidão agrícola das terras da bacia hidrográfica do Ribeirão Taguatinga, Distrito Federal.
Provedor de dados: 14
Autores: SPERA, S. T.; REATTO, A.; MARTINS, E. de S.; FARIAS, M. F. R.; SILVA, A. V. da.
RESUMO: A área da bacia hidrográfica do Ribeirão Taguatinga (Área de Relevante Interesse Ecológico Juscelino Kubitschek - ARIE JK), no Distrito Federal, tem superfície de 77,50 km2. As principais classes de solos que ocorrem nessa área são: Latossolos, Argissolos, Cambissolos, Gleissolos, Plintossolos, Neossolos Fúvicos e Neossolos Quartzarênicos cujas principais características químicas, físicas e morfológicas estão apresentadas neste trabalho com o objetivo de subsidiar projetos de desenvolvimento e assentamentos locais. Em realação à aptidão agrícola, os Latossolos são classificados como 2(b)c, 2c e 3(c) e os Argissolos como 2(b)c. Os Cambissolos como 5(n) e 6. Os Gleissolos são classificados como 3(b)c, 3(c) e 5(n), enquanto os Plintossolos apresentam...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Mapeamento; Plintossolo; Gleissolo; Plinthic soil.; Aptidão Agrícola; Cambissolo; Classificação do Solo; Cerrado; Latossolo; Oxisol; Uso da Terra.; Solo; Inceptisols; Brazil; Land suitability; Land use; Soil surveys.; Soil classification; Soil.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569094

Aptidao agricola das terras da Bacia do Olaria, Distrito Federal.
Provedor de dados: 14
Autores: SPERA, S. T.; REATTO, A.; MARTINS, E. de S.; CORREIA, J. R.; BLOISE, G. de L. F.; SILVA, A. V. da; FARIAS, M. F. R.
bitstream/CPAC-2010/22719/1/bolpd-15.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: ECOSOL110; Bacia do Olaria; Distrito Federal; Brasil; Levantamento de solo; Plintossolo; Gleissolo; Plinthic soil; Savanna soil.; Aptidão Agrícola; Cambissolo; Cerrado; Fertilidade do Solo; Latossolo; Oxisol; Perfil do Solo; Reconhecimento do Solo; Textura do Solo; Uso da Terra.; Solo; Inceptisols; Land suitability; Land use; Soil surveys.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566072

Correcao do solo e adubacao da cultura da soja.
Provedor de dados: 14
Autores: SOUSA, D. M. G. de; LOBATO, E.
In order to grow soybeans in cerrado soils it is necessary a previous, reduction of soil acidity and to build up the soil fertility. It is recommended the application of limestone to raise the soil pH up to the range between 5,5 and 6,0 or to increase base saturation up to 50%. The chemical constraints for root growth in the subsurface soil layers, such as the high aluminum saturation and/or calcium defficiency, can be overcome by the addition of gypsum. The recomended levels of gypsum vary from 700 kg/ha for sandy soils to 3200 kg/ha for heavy clayey soils. Fertilizers to supply phosphorus and potassium are recommended according to their availability in the soil determined by chemical analysis. Critical levels for those nutrients as well as the...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Micronutriente; Avaliacao; Aspecto economico; Phosphate fertilizers; Potash fertilizers; Micronutrient fertilizers; Evaluation; Economic situation.; Acidez do Solo; Adubação; Calagem; Cerrado; Fertilidade do Solo; Fertilizante Potássico; Fertilizante Nitrogenado; Fertilizante Fosfatado; Glycine Max; Microelemento; Oxisol; Soja.; Ferralsols; Acid soils; Fertilizer application; Liming; Nitrogen fertilizers; Soil fertility; Trace elements.; Soybeans.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/551684

Use of urease inhibitors to reduce ammonia volatilization in Amazonian soils
Provedor de dados: 86
Autores: Barberena,Iara Magalhães; Espindula,Marcelo Curitiba; Araújo,Larissa Fatarelli Bento de; Marcolan,Alaerto Luiz.
Abstract: The objective of this work was to evaluate urease inhibitors for the reduction of ammonia volatilization in Amazonian soils. The work was carried out on a clayey yellow Oxisol, a clayey red Oxisol, and on a light silty Ultisol. Each experiment was conducted in split plots, using standard urea, urea + a benzimidazole-type urease inhibitor (BZI1), urea + a benzoylthiourea-type urease inhibitor (RTB68), urea + N-(n-butyl) triamide thiophosphate (NBPT), or a fertilizer-free control. Volatilized ammonia was collected at 48, 96, 144, 192, 240, 288, 336, and 384 hours after fertilization. Ammonia volatilization reached a maximum at 144 hours in the urea, urea + benzimidazole, and urea + benzoylthiourea treatments. A peak level was reached at 192 and 288...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benzimidazole; Benzoylthiourea; Oxisol; Plinthosol; Urease inhibitors.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000103800

Imazaquin sorption in surface and subsurface soil samples
Provedor de dados: 86
Autores: Oliveira,Maurílio Fernandes de; Prates,Hélio Teixeira; Santanna,Derli Prudente; Oliveira Júnior,Rubem Silvério de.
The objective of this work was to study the sorption and desorption of imazaquin, in surface and subsurface soil samples from Brazil. Sorption and desorption steps were carried out using batch equilibration and high performance liquid chromatography analytical routines. The value of Kf,ads was positively correlated with clay content, and negatively correlated with pH of supernatant. Samples from Typic Haplustox, clayey soil profile having high clay content, provided higher Kf,ads values, and negative correlation with organic carbon, silt content, cation exchange capacity and pH.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Retention; Desorption; Oxisol; Sustainability.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000300013

Role of soil carbon in the landscape functioning of the Alto São Bartolomeu watershed in the Cerrado region, Brazil
Provedor de dados: 86
Autores: Alves,Ray Pinheiro; Couto Junior,Antonio Felipe; Martins,Eder de Souza; Nardoto,Gabriela Bielefeld.
Abstract The objective of this work was to evaluate the effect of soil carbon on landscape functioning of the Oxisols covering the plateaus of the Alto São Bartolomeu watershed, in the Cerrado (Brazilian savanna) region of Central Brazil. Soil organic carbon (SOC) concentration, carbon stocks, and some soil physical and chemical characteristics were determined at the 0-0.20-m depth on native and anthropogenic areas. Soils from cerrado stricto sensu patches were similar both physically and chemically, being affected by exchangeable Al3+ and by SOC concentrations, while anthropogenic matrices were affected by soil bulk density, pH, extractable P, and exchangeable Ca2+ and Mg2+. The estimate of spatial distribution of soil carbon better fitted had an adjusted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; No-tillage; Oxisol; Pasture; Pedotransfer function; Vegetation indices.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901241

Phosphorus utilization by corn as affected by green manure, nitrogen and phosphorus fertilizers
Provedor de dados: 86
Autores: Silva,Edson Cabral da; Muraoka,Takashi; Franzini,Vinícius Ide; Villanueva,Felipe Carlos Alvarez; Buzetti,Salatiér; Moreti,Dolorice.
The objective of this work was to evaluate the utilization by corn plants of P from triple superphosphate fertilizer labeled with 32P (32P‑TSP), and of P from soil as affected by N rates and by the green manures (GM) sunn hemp (Crotalaria juncea) and millet (Pennisetum glaucum). The experiment was carried out using pots filled with 5 kg Oxisol (Rhodic Hapludox). A completely randomized design was used, in a 4x4x2 factorial arrangement, with four replicates. The treatments were: four P rates as TSP (0, 0.175, 0.350, and 0.700 g P per pot); four N rates as urea (0, 0.75, 1.50, and 2.25 g N per pot); and sunn hemp or millet as green manure. The additions of N and P by the GM were taken into account. After grain physiologic maturation, corn dry matter, P...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Cover crop; Isotopic dilution; Oxisol; Radioisotope; Urea.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000800016

Amaranth, quinoa, and millet growth and development under different water regimes in the Brazilian Cerrado
Provedor de dados: 86
Autores: Jayme-Oliveira,Adilson; Ribeiro Júnior,Walter Quadros; Ramos,Maria Lucrécia Gerosa; Ziviani,Adley Camargo; Jakelaitis,Adriano.
Abstract: The objective of this work was to evaluate the growth dynamics of the cover plants amaranth (Amaranthus cruentus), quinoa (Chenopodium quinoa), and millet (Pennisetum glaucum) in a Typic Acrustox, under different water regimes in the Brazilian Cerrado. The cultivation was carried out in the winter, with reduced rainfall, which facilitated the application of varying irrigation depths to the different crops. Water regimes denominated lower, lower middle, upper middle, and upper - corresponding to 217, 386, 563, and 647 mm water depths, respectively - were tested by means of an irrigation bar composed of sprinklers with different flow rates. Plant growth was quantified by weekly collections. Amaranth was the most responsive plant to water. Quinoa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amaranthus cruentus; Chenopodium quinoa; Pennisetum glaucum; Oxisol; Water stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000800561

Anatomical Changes on the Stem and Leaves of Solanum lycopersicum Caused by Different Concentrations of Picloram + 2,4-D, in Two Different Types of Soil
Provedor de dados: 87
Autores: BATISTÃO,A.C.; YAMASHITA,O.M.; SILVA,I.V.; ARAÚJO,C.F.; LAVEZO,A.
ABSTRACT: Contamination by herbicides with a prolonged effect on the soil can cause anatomical changes in sensitive plants. Thus, this study aimed at verifying the anatomical changes of tomato stem and leaves caused by different concentrations of picloram in two classes of soil from the Amazon region. The study was developed at UNEMAT, Alta Floresta - Mato Grosso state, in a CRD, in a 2 x 5 factorial arrangement, with four replications. A clayey Rhodic Hapludox (LVAw) and a sandy clay loam Typic Ustipsamments (RQo) were contaminated with 0, 1, 2, 3, and 4 L ha-1 of Tordon®, leaving the soil exposed to weathering. One-hundred and twenty days after the application of the herbicide, 10 tomato seeds were sown in samples of both soils. Thirty days after sowing,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf blade; Synthetic auxin; Oxisol; Entisol; Tomato.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100303

Surface Complexation Modeling in Variable Charge Soils: Prediction of Cadmium Adsorption
Provedor de dados: 90
Autores: Marchi,Giuliano; Vilar,Cesar Crispim; O’Connor,George; Oliveira,Letuzia Maria de; Reatto,Adriana; Rein,Thomaz Adolph.
ABSTRACT Intrinsic equilibrium constants for 22 representative Brazilian Oxisols were estimated from a cadmium adsorption experiment. Equilibrium constants were fitted to two surface complexation models: diffuse layer and constant capacitance. Intrinsic equilibrium constants were optimized by FITEQL and by hand calculation using Visual MINTEQ in sweep mode, and Excel spreadsheets. Data from both models were incorporated into Visual MINTEQ. Constants estimated by FITEQL and incorporated in Visual MINTEQ software failed to predict observed data accurately. However, FITEQL raw output data rendered good results when predicted values were directly compared with observed values, instead of incorporating the estimated constants into Visual MINTEQ. Intrinsic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Intrinsic equilibrium constants; Oxisol; FITEQL; Visual MINTEQ; Chemical equilibrium software.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501395

Effectiveness of Five Biosolids as Nitrogen Sources to Produce Single and Cumulative Ryegrass Harvests in Two Australian Soils
Provedor de dados: 90
Autores: Corrêa,Rodrigo Studart; Silva,Douglas José da.
ABSTRACT Biosolids have been produced by various stabilization processes of sewage sludge, but little attention has been given to the effects of such treatments on their effectiveness to supply nitrogen for plant growth. Here, we investigated these effects by cultivating Lolium perenne (ryegrass) in two Australian soils, a sandy Spodosol and a clayey Oxisol. Biosolids stabilized by either aerobic digestion, composting, CaO-liming, 250 oC heat-drying or solar irradiation of domestic sewage sludge were applied to soils at 10 increasing rates (0.25-8.0 dry Mg ha-1), and chemically fertilized soils were used as reference. Results showed that the stabilization processes affected biosolids-N agronomic rates and effectiveness to yield plant biomass, which was a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sewage sludge; Organic-N; Plant nutrients; Oxisol; Spodosol.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100523

Geoecological drivers of cerrado heterogeneity and 13C natural abundance in oxisols after land-use change
Provedor de dados: 90
Autores: Neufeldt,Henry.
The 13C natural abundance technique was applied to study C dynamics after land-use change from native savanna to Brachiaria, Pinus, and Eucalyptus in differently textured Cerrado Oxisols. But due to differences in the d13C signatures of subsoils under native savanna and under introduced species, C substitution could only be calculated based on results of cultivated soils nearby. It was estimated that after 20 years, Pinus C had replaced only 5 % of the native C in the 0-1.2 m layer, in which substitution was restricted to the top 0.4 m. Conversely, after 12 years, Brachiaria had replaced 21 % of Cerrado C to a depth of 1.2 m, where substitution decreased only slightly throughout the entire profile. The high d13C values in the subsoils of the cultivated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado formations; 13C natural abundance; Waterlogging; Oxisol; Soil fertility; Land-use change.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832006000500015

Determination of hydraulic properties of a tropical soil of Hawaii using column experiments and inverse modeling
Provedor de dados: 90
Autores: Sobotkova,Martina; Snehota,Michal; Dohnal,Michal; Ray,Chittaranjan.
A method for determining soil hydraulic properties of a weathered tropical soil (Oxisol) using a medium-sized column with undisturbed soil is presented. The method was used to determine fitting parameters of the water retention curve and hydraulic conductivity functions of a soil column in support of a pesticide leaching study. The soil column was extracted from a continuously-used research plot in Central Oahu (Hawaii, USA) and its internal structure was examined by computed tomography. The experiment was based on tension infiltration into the soil column with free outflow at the lower end. Water flow through the soil core was mathematically modeled using a computer code that numerically solves the one-dimensional Richards equation. Measured soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Automated apparatus; Infiltration experiment; Retention curve; Hydraulic conductivity; Oxisol; Structured soil.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400016

Correction of resistance to penetration by pedofunctions and a reference soil water content
Provedor de dados: 90
Autores: Moraes,Moacir Tuzzin de; Debiasi,Henrique; Franchini,Julio Cezar; Silva,Vanderlei Rodrigues da.
The soil penetration resistance is an important indicator of soil compaction and is strongly influenced by soil water content. The objective of this study was to develop mathematical models to normalize soil penetration resistance (SPR), using a reference value of gravimetric soil water content (U). For this purpose, SPR was determined with an impact penetrometer, in an experiment on a Dystroferric Red Latossol (Rhodic Eutrudox), at six levels of soil compaction, induced by mechanical chiseling and additional compaction by the traffic of a harvester (four, eight, 10, and 20 passes); in addition to a control treatment under no-tillage, without chiseling or additional compaction. To broaden the range of U values, SPR was evaluated in different periods....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pedotransfer functions; Oxisol; Impact penetrometer; Soil compaction.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000600004

Plant-available soil water capacity: estimation methods and implications
Provedor de dados: 90
Autores: Silva,Bruno Montoani; Silva,Érika Andressa da; Oliveira,Geraldo César de; Ferreira,Mozart Martins; Serafim,Milson Evaldo.
The plant-available water capacity of the soil is defined as the water content between field capacity and wilting point, and has wide practical application in planning the land use. In a representative profile of the Cerrado Oxisol, methods for estimating the wilting point were studied and compared, using a WP4-T psychrometer and Richards chamber for undisturbed and disturbed samples. In addition, the field capacity was estimated by the water content at 6, 10, 33 kPa and by the inflection point of the water retention curve, calculated by the van Genuchten and cubic polynomial models. We found that the field capacity moisture determined at the inflection point was higher than by the other methods, and that even at the inflection point the estimates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Field capacity; Permanent wilting point; Soil water retention curve modeling; Oxisol; Land use planning.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200011

Relationships between soil class and nutritional status of coffee plantations
Provedor de dados: 90
Autores: Wadt,Paulo Guilherme Salvador.
Farm planning requires an assessment of the soil class. Research suggest that the Diagnosis and Recommendation Integrated System (DRIS) has the capacity to evaluate the nutritional status of coffee plantations, regardless of environmental conditions. Additionally, the use of DRIS could reduce the costs for farm planning. This study evaluated the relationship between the soil class and nutritional status of coffee plants (Coffea canephora Pierre) using the Critical Level (CL) and DRIS methods, based on two multivariate statistical methods (discriminant and multidimensional scaling analyses). During three consecutive years, yield and foliar concentration of nutrients (N, P, K, Ca, Mg, S, B, Zn, Mn, Fe and Cu) were obtained from coffee plantations cultivated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DRIS; Critical level; Plant nutrition; Nutritional diagnosis; Soil classification; Oxisol; Coffea canephora.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832005000200008

Heavy metals extractability in a soil amended with sewage sludge
Provedor de dados: 63
Autores: Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Chang,Andrew C.; Nascimento,Clístenes Williams Araújo do.
Few investigations have been carried out about the comparison of desorption rate and amount of heavy metals extracted successively by organic acid mixtures mimicking the rhizosphere and routine extractants in sewage sludge-amended soils. Extractions of Zn, Cd, Ni, Cr, and Cu were performed in samples of a sewage sludge-amended soil using seven extractants: four organic acid mixtures and three routine extractants (DTPA, Mehlich-I, and ammonium acetate). Results from single pass extractions, in which the extractable metal contents were determined by simply extracting the soil a single time, as well as from 15 successive extractions, in which the solid residues of the first extraction was successively extracted 14 additional times, of heavy metals were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxisol; Extraction rate; Trace elements.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500009

Conversion of cerrado into agricultural land in the south-western Amazon: carbon stocks and soil fertility
Provedor de dados: 63
Autores: Carvalho,João Luís Nunes; Carlos Eduardo Pelegrino,Cerri; Feigl,Brigitte Josefine; Píccolo,Marisa de Cássia; Godinho,Vicente de Paula; Herpin,Uwe; Cerri,Carlos Clemente.
Land use change and land management practices can modify soil carbon (C) dynamics and soil fertility. This study evaluated the effect of tillage systems (no-tillage - NT and conventional tillage - CT) on soil C and nutrient stocks in an Oxisol from an Amazonian cerrado following land use change. The study also identified relationships between these stocks and other soil attributes. Carbon, P, K, Ca and Mg stocks, adjusted to the equivalent soil mass in the cerrado (CE), were higher under NT. After adoption of all but one of the NT treatments, C stocks were higher than they were in the other areas we considered. Correlations between C and nutrient stocks showed positive correlations with Ca and Mg under NT due to continuous liming, higher crop residue...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxisol; No-tillage; Conventional tillage; Nutrient stock.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200013

Fractal dimension and geostatistical parameters for soil microrelief as a function of cumulative precipitation
Provedor de dados: 63
Autores: Vázquez,Eva Vidal; Vieira,Sidney Rosa; De Maria,Isabella Clerici; González,Antonio Paz.
Surface roughness isinfluenced by type and intensity of soil tillage among other factors, and it changes considerably with rain. In microrelief studies the advantages of using indices such as the fractal dimension, D, and the crossover length, l, is that they allow the partition of the roughness characteristics into properties that depend purely on the scale and on a scale free component, respectively. On the other hand, some geostatistical parameters may provide different ways to understand soil surface variability not addressed with fractal parameters. Changes in fractal dimension and semivariogram parameters for surface roughness evolution were evaluated as a function of cumulative rainfall on Oxisol samples over six tillage treatments, namely, disc...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxisol; Tillage; Soil surface roughness; Semivariogram; Crossover length.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100011

Indicadores químicos de calidad de suelos en sistemas productivos del Piedemonte de los Llanos Orientales de Colombia
Provedor de dados: 109
Autores: Jamioy Orozco,Diego David; Menjivar Flores,Juan Carlos; Rubiano Sanabria,Yolanda.
En sistemas productivos del Piedemonte de los Llanos Orientales de Colombia se evaluaron varios indicadores para determinar la calidad de los suelos de la región. Para el efecto, en un muestreo aleatorio se incluyeron once sistemas y en cada uno de ellos se tomaron cinco muestras de suelo para evaluar las propiedades principales y seleccionar aquellas con posibilidades para ser incluidas como indicadores de calidad. Los resultados de la caracterización completa fueron analizados mediante componentes principales (ACP). Por su importancia fueron priorizadas como indicadores de calidad las propiedades siguientes: carbono orgánico, pH, acidez intercambiable, calcio y magnesio intercambiable y hierro. Con estos indicadores se propone una clasificación de la...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxisol; Muestreo; Análisis de componentes principales; Clasificación.
Ano: 2015
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122015000400003

Respuesta agronómica de cuatro variedades de caña de azúcar en los Llanos Orientales de Colombia
Provedor de dados: 109
Autores: Castillo,Alvaro Rincón; Becerra Campiño,Julio Jairo.
Resumen En un Oxisol de los Llanos Orientales de Colombia se establecieron y evaluaron tres variedades de caña de azúcar Cenicaña Colombia (CC) (CC 8475, CC 833895, CC 8592) y una de República Dominicana (RD 7511) con el objeto de determinar la producción de biomasa y el área foliar. En un diseño de bloques completos al azar con tres repeticiones, cada mes, entre los 7 y 11 meses de edad de cultivo, fueron evaluados el desarrollo agronómico, la producción de biomasa verde, la concentración de sacarosa y el área foliar. La producción total de biomasa (hoja + tallo) fue más alta (P &lt; 0.05) en las variedades CC8475 y RD7511, con rendimientos de 110 y 106 t/ha, y170 y 161 t/ha a 7 meses y 11 meses de edad de cultivo, respectivamente. Se encontró una alta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Área foliar; Biomasa; Grados brix; Oxisol; Suelos ácidos.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122020000200124

Role of VAM on growth and phosphorus nutrition of maize with low soluble phosphate fertilization
Provedor de dados: 109
Autores: Rakshit,Amitava; Bhadoria,Pratapbhanu S.
The effect of vesicular arbuscular mycorrhizal (VAM) infection on growth and P nutrition in Maize (Zea mays, cv.DDH hybrid) were assessed in Oxisol pot experiment. Maize was grown inoculated with spores of VAM fungi Glomus mosseae or non-inoculated. Low soluble ferrous phosphate (FePO4.4H2O) was added to the mycorrhized and non-micrrohized maized. The dry weight of mycorrhized plants with added phosphate (P) were higher than in mycorrhized plants without added P or non-mycorrhized plants with added P. The amount of P in the soil samples from pots with mycorrhizal plants fertilized with P was evidently smaller than those in samples also fertilized non-mycorrhizal plants. The percentage of P was higher in tissues of fertilized mycorrhial plants than in those...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycoryhyzae; Micorrizas arbusculares; Glomus mosseae; Phosphorus; Maize; Oxisol.
Ano: 2010
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122010000100015

AUSÊNCIA DE MICORRIZAS VESÍCULO-ARBUSCULARES EFETIVAS EM LECYTHIDACEAS NUMA ÁREA DE FLORESTA PRIMÁRIA DA AMAZÔNIA CENTRAL.
Provedor de dados: 36
Autores: MOREIRA,F.W.; OLIVEIRA,L.A. de; BECKER,P.
As Lecythidaceae compreendem uma das quatro famílias de árvores mais abundantes na floresta amazônica, mas foram pouco estudadas no que sc refere à simbiose com fungos micorrízicos dos solos. Foram coletadas raízes de 31 espécies de seis gêneros desta família numa floresta de terra firme da Amazônia Central, próxima a Manaus, sob um latossolo amarelo. Em algumas espécies observou-se uma ausência total de fungos nas raízes, enquanto que em outras, apenas algumas hifas de fungos, mas sem vesículas ou arbúsculos, estruturas que serviriam para confirmar a presença de micorrizas vesículo-arbusculares efetivas nas mesmas. As poucas bifas encontradas não seriam suficientes para aumentar a absorção de nutrientes do solo, indicando que nas condições edáficas e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazônia; Oxisol; Latossolo.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671997000100003

Adsorption of P and forms of iron in no-tillage areas in the ‘Cerrado’ biome
Provedor de dados: 1
Autores: Pereira, Marcos Gervasio; Guareschi, Roni Fernandes; Perin, Adriano.
The objective of this study was to evaluate the forms of iron extracted as sodium dithionite-citrate-bicarbonate (Fed), acid ammonium oxalate (Feo) and sodium pyrophosphate (Fep) and the relationship between these variables and the total organic carbon content and maximum adsorption capacity of P (MACP). The areas selected for this study had been using a no-tillage system (NTS) for varying periods of time: 3 years (NTS3), 15 years (NTS15) and 20 years (NTS20). These areas were compared with an area of native ‘Cerrado’ (CE) and a pasture area planted with Brachiaria decumbens (PA). The soil of the areas studied was classified as dystrophic oxisol. In each area, samples were collected at 0–5 cm and 5–10 cm. A correlation was observed between the C content...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências Agrárias - Agronomia - Ciência do Solo soil organic matter; Pasture; Iron oxides; Oxisol Fertilidade do Solo soil organic matter; Pasture; Iron oxides; Oxisol.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17686

Effectiveness of Arbuscular Mycorrhizal Fungal Isolates from the Land Uses of Amazon Region in Symbiosis with Cowpea
Provedor de dados: 42
Autores: SILVA,GLÁUCIA ALVES E; SIQUEIRA,JOSÉ O.; STÜRMER,SIDNEY L.; MOREIRA,FATIMA M.S.
ABSTRACT Arbuscular mycorrhizal fungi provide several ecosystem services, including increase in plant growth and nutrition. The occurrence, richness, and structure of arbuscular mycorrhizal fungi communities are influenced by human activities, which may affect the functional benefits of these components of the soil biota. In this study, 13 arbuscular mycorrhizal fungi isolates originating from soils with different land uses in the Alto Solimões-Amazon region were evaluated regarding their effect on growth, nutrition, and cowpea yield in controlled conditions using two soils. Comparisons with reference isolates and a mixture of isolates were also performed. Fungal isolates exhibited a wide variability associated with colonization, sporulation, production of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Inceptisol; Oxisol; Root colonization; Vigna unguiculata.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100357

Nutritional evaluation of Guanandi seedlings fertilized with sewage sludge
Provedor de dados: 53
Autores: Brandani,Carolina Braga; Kühl,Amanda Santos; Ilario,Vicenzo Enrico; Pitombo,Leonardo Machado; Ferreira-Filho,Pedro José; Pereira,Elisabete Alves; Oliveira,Luciana Camargo; Carmo,Janaina Braga do.
ABSTRACT The generation of sewage sludge and the concern with their fate has greatly increased. The objective of this study was to assess the effects of using in natura (SS) or composted sewage sludge (SSC) in comparison with mineral fertilizer (MF) application and a control (CT) treatment on the nutritional status of Guanandi (Calophyllum brasiliense Cambess.) seedlings in a typical Red Oxisol in Brazil. The leaf-level nutritional responses of the Guanandi seedlings to these three different fertilizers and the control were evaluated at 90 and 180 days after planting. Nutritional data of leaf variables were compared between the treatments by means of one-way analysis of variance using the F test and a pair-wise comparison of means done by Tukey’s test. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calophyllum brasiliense; Organic fertilizer; Mineral nutrition; Oxisol; Silviculture; Brazilian tree.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200253

Effects of nickel fertilization on soybean growth in tropical soils
Provedor de dados: 53
Autores: Levy,Camila de Carvalho Braga; Mellis,Estêvão Vicari; Murrer,Marina Krey; Inglés,Carlos Repiso; Daynes,Cathal N.; Cavalli,Edilson; Chiba,Marcio Koiti.
ABSTRACT Although nickel (Ni) is recognized as plant nutrient since the turn of the 21st century, uncertainty remains about its optimum application rates and forms. This paper focuses on Ni application in soils, relating to its effect as a plant micronutrient. Specifically, the effect of Ni on the activity of urease in soybean plants is examined. The effects of applying four Ni rates in two different soil types were tested. A full factorial 2 × 4 blocked design experiment was established under controlled conditions. Ni rates (0, 0.25, 0.5 and1.0 mg of Ni·kg–1 of soil) were applied in two soils with contrasting clay contents. The addition of Ni increased the urease activity in soybean plants but was affected by soil textural differences. The highest urease...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urease; Clay; Sand; Oxisol; Glycine max.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300432

Growth of rice plants in an Acrustox fertilized with silicon and manganese
Provedor de dados: 65
Autores: Zanão Júnior,Luiz Antônio; Fontes,Renildes Lúcio Ferreira; Korndörfer,Gaspar Henrique; Ávila,Vinícius Tavares de; Carvalho-Zanão,Maristela Pereira.
The objective of this research was to study the biomass production, plant architecture and Si and Mn uptake in rice plants cultivated in a Acrustox fertilized with silicon and manganese. The experiment was carried out in a greenhouse using a 2x5 factorial (0 and 1000mg dm-3 Si x 0, 4, 12, 16 and 20mg dm-3 Mn) with four replications, in a randomized block design. The application of Si to the soil resulted in a smaller leaf insertion angle, a greater Si content in the leaves and roots and biomass production. Moreover, Si caused the decrease content of Mn in leaves and its increase in roots. With the rising dose of Mn, there was an increase in the content of this element in soil, roots and leaves, regardless of the Si application and reduction in biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Silicate; Oxisol; Plant nutrition.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010001100024

Nutrient recycling of sorghum straw and soil biological attributes in Eastern Amazon
Provedor de dados: 64
Autores: Maia,Patrícia Ribeiro; Fernandes,Antonio Rodrigues; Melo,Vânia Silva; Santos,Elaine Rodrigues; Silva,Gisele Barata da.
The microbial biomass and activity are biological indicators sensitive to environmental changes caused by agricultural use and can provide important information for the planning of adequate land use. The objective of this research was to evaluate the nutrient recycling, persistence, and biological attributes of sorghum straw in Oxisol as a function of soil management systems. The experiment was carried out at the Federal Rural University of Amazonia in randomized block design with 3 x 2 factorial and four replicates. Three sorghum hybrids and two soil management systems were the factors used to assess straw decomposition. In order to evaluate the biological attributes, a 2 x 2 factorial experiment with four replicates was carried out using two soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial biomass; C/N ratio; Oxisol.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000500004