Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 483
Primeira ... 123456789 ... Última
Imagem não selecionada

Imprime registro no formato completo
Collembola in grassland - included in the new project SoilEffects Organic Eprints
Pommeresche , Reidun; Løes, Anne-Kristin.
This paper presents preliminary results on Collembola, studied in a field experiment at Tingvoll research farm, NW Norway as a part of the project SoilEffects. The aim of the project is to compare effects on soil biology and fertility of digested (in a biogas plant) and undigested slurry (from milking cows)in a perennial grass/clover-system and in an arable system.
Tipo: Conference paper, poster, etc. Palavras-chave: Soil quality; Soil biology.
Ano: 2012 URL: http://orgprints.org/20668/1/Pommeresche_and_L%C3%B8es_NJF_2012_collembola_final_version.docx
Imagem não selecionada

Imprime registro no formato completo
Collembola in grassland – included in the new project SoilEffects Organic Eprints
Pommeresche, Reidun; Løes, Anne-Kristin.
Little is known about Collembola in arable soil, at least in Norway. Recently, a study including this group has been initiated in a Norwegian field experiment Soileffects). Collembola (springtails) are a group of small animals (1-3 mm) living in vegetation,litter and in the pores and caves in the soil to a depth of ca 15 cm. They are important decomposers of dead plant material, eating fungi, algae and microorganisms in soil and on organic debris. Their grazing and decomposing activity contribute significantly to the nutrient circulation in the soil. The name springtail refers to a furca on their back, usually folded in under the body, but released in need of a rapid escape. In one jump, Collembola can jump more than 50 times their own body length. In...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil quality; Soil biology.
Ano: 2012 URL: http://orgprints.org/21993/1/Pommersche%20og%20Loes%20Collembola%20NJF%20Abstract.pdf
Imagem não selecionada

Imprime registro no formato completo
Communities of arbuscular mycorrhizal fungi in arable soils are not necessarily low in diversity Organic Eprints
Hijri, Isabelle; Sýkorová, Zuzana; Oehl, Fritz; Ineichen, Kurt; Mäder, Paul; Wiemken, Andres; Redecker, Dirk.
Communities of arbuscular mycorrhizal fungi (AMF) in five agricultural field sites of different management intensities were studied. Variable regions of the ribosomal RNA genes were used to detect and identify AMF directly within colonized roots. Roots from a continuous maize monoculture showed low AMF diversity, in agreement with previous reports on molecular diversity of AMF in agricultural soils. In contrast, a substantially higher diversity of AMF was found throughout the long term `DOK' field experiment, where organic and conventional agricultural practices have been compared side by side since 1978. In this experiment, a 7-year crop rotation is performed under lower levels of inorganic fertilizer input and chemical pest control. These results are in...
Tipo: Journal paper Palavras-chave: Soil biology; Soil quality.
Ano: 2007 URL: http://orgprints.org/13462/1/hijri%2Detal%2D2006%2Dmolecular_ecology%2Dvol15%2D2277%2D89.pdf
Imagem não selecionada

Imprime registro no formato completo
Comparison of methods for measuring soil microbial activity using cotton strips and a respirometer Organic Eprints
Nachimuthu, G.; King, K.; Kristiansen, P.; Lockwood, P.; Guppy, C..
In order to develop a method of measuring the level of microbial activity in soil that is suitable for use by farmers, land managers, and other non-scientists, a simple method for determining soil microbial activity was evaluated and compared with two standard techniques. Soils sampled from vegetable farms in south east Queensland were incubated in the laboratory under controlled moisture and temperature conditions. Three methods were used to measure soil microbial activity, a respirometry method and two methods using the cotton strip assay (CSA) technique (image analysis and tensometer). The standard CSA method measured loss of tensile strength over a 35 day incubation period of buried cotton strips using a tensometer. The new CSA technique measured the...
Tipo: Journal paper Palavras-chave: Soil biology; Research methodology and philosophy.
Ano: 2008 URL: http://orgprints.org/14040/4/14040.pdf
Imagem não selecionada

Imprime registro no formato completo
Composition of hydrolysable amino acids in soil organic matter and soil microbial biomass Organic Eprints
Friedel, Jürgen K.; Scheller, Edwin.
We hydrolysed (6 M HC1) soll organic matter (SOM) from mineral top-soil horizons, litter, and the fraction rendered extractable by 0.5 M K2SO4 after Chloroform fumigation from eight soils under arable, grassland and forest use. covering a wide ränge of site conditions. Our aims were to quantify amino acid contents in the hydrolysate derived from whole soil. litter and soil microbial biomass, respectively. We also wanted to test if the pattern of hydrolysable amino acids of the whole soil is uniform irrespective of site conditions and land use. and if there i s a relation with the amino acid pattern of the respective soil microbial Community. The content of hydrolysable amino acids in the whole soil was higher in the soil samples from grassland and forest...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Soil biology.
Ano: 2002 URL: http://orgprints.org/1372/1/kein%2DDokument.pdf
Imagem não selecionada

Imprime registro no formato completo
Comunidades de fungos micorrízicos arbusculares associados ao amendoim forrageiro em pastagens consorciadas no Estado do Acre, Brasil. Repositório Alice
MIRANDA, E. M. de; SILVA, E. M. R. da; SAGGIN JUNIOR, O. J..
O objetivo deste trabalho foi identificar e estimar a diversidade de comunidades de fungos micorrízicos arbusculares (FMAs) autóctones associados ao amendoim forrageiro (Arachis pintoi), em monocultivo e consorciado com outras forrageiras. A amostragem foi realizada em sete áreas, em Rio Branco, AC, sendo coletadas quatro amostras de solo em cada área, na profundidade de 0-10 cm, nas estações seca (junho de 2004) e chuvosa (janeiro de 2005). As áreas cultivadas com A. pintoi foram: monocultivo, consórcio com pastagens de gramíneas e outras leguminosas e como cobertura do solo em cafeeiro, além de capoeira e mata adjacentes como testemunhas. Foi verificada a ocorrência de 21 espécies de FMAs nas duas estações, sendo 18 espécies no período seco e 16 no...
Tipo: Artigo de periódico Palavras-chave: Amendoim forrageiro; Fungo micorrízico arbuscular (FMA); Rio Branco (AC); Acre; Amazônia Ocidental; Biología del suelo; Fertilidad del suelo; Dinámica poblacional; Hongos mycorrhizales.; Biologia do solo; Fertilidade do solo; Monocultura; Consorciação de cultura; Leguminosa forrageira; Fungo; Flutuação populacional; Estimulante de crescimento vegetal; Soil biology; Soil fertility; Mycorrhizal fungi; Population dynamics; Arachis pintoi..
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/657810
Imagem não selecionada

Imprime registro no formato completo
Crop yield and soil fertility response to reduced tillage under organic management Organic Eprints
Berner, Alfred; Hildermann, Isabell; Fliessbach, Andreas; Pfiffner, Lukas; Niggli, Urs; Mäder, Paul.
Conservation tillage (no-till and reduced tillage) brings many benefits with respect to soil fertility and energy use, but it also has drawbacks regarding the need for synthetic fertilizers and herbicides. Our objective was to adapt reduced tillage to organic farming by quantifying effects of tillage (plough versus chisel), fertilization (slurry versus manure compost) and biodynamic preparations (with versus without) on soil fertility indicators and crop yield. The experiment was initiated in 2002 on a Stagnic Eutric Cambisol (45% clay content) near Frick (Switzerland) where the average annual precipitation is 1000 mm. This report focuses on the conversion period and examines changes as tillage intensity was reduced. Soil samples were taken from the 0-10...
Tipo: Journal paper Palavras-chave: Soil quality; Soil biology.
Ano: 2008 URL: http://orgprints.org/14426/1/Berner_et_al_2008_Tillage.pdf
Imagem não selecionada

Imprime registro no formato completo
C-TOOL version 1.1. A tool for simulation of soil carbon turnover. Description and users guide Organic Eprints
Petersen, B.M..
The program C-TOOL (v. 1.1) can enhance SOM model development by aiding the construction, revision and testing of soil carbon turnover models. Models can be created directly, without the aid of programmers. The program can use any time step between one day and one year, and can be run either for a predefined period or continue until specified steady-level criterions for carbon pools are reached. Development in soil carbon content at any desired time span can be simulated. Simulation of carbon isotopes 13C and 14C is facilitated, and it is possible to simulate a specific isotope tagging in order to investigate carbon flow properties in the implemented model. Standard driving variables are temperature (in air or soil), soil water content (either absolute...
Tipo: Web product Palavras-chave: Soil biology.
Ano: 2003 URL: http://orgprints.org/4664/1/4664.pdf
Imagem não selecionada

Imprime registro no formato completo
Deep roots of Brassica oleracea have high uptake of 15N-nitrate to 2 meters soil depth Organic Eprints
Kristensen, H.L.; Thorup-Kristensen, K..
• Deep roots may be important for uptake of NO3- by annual crops. A field experiment with the deep rooted crop curly kale (Brassica oleracea L. convar. acephala (DC.) Alef. var. sabellica L.) was performed to investigate root distribution and N uptake in deep soil layers. • Root distribution was investigated by use of minirhizotrons and root extractions to 2.4 m depth. The capacity for crop N uptake was studied by deep 15NO3- placement followed by analysis of plant 15N content after 3-30 days. • The atom percent 15N excess (APE) of plant samples was of similar size after uptake of 15N placed at depths in the range of 0.4-2 m. Root colonisation and start of 15N uptake were synchronized in 2.4 m depth. • The deep roots had higher inflow of 15N compared...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Soil biology; Farm nutrient management; Air and water emissions.
Ano: 2006 URL: http://orgprints.org/7918/1/7918.pdf
Imagem não selecionada

Imprime registro no formato completo
Der Einfluss organischer Düngung im Langzeitdüngungsversuch auf das Ausmaß der Wurzelinfektion mit Arbuskulärer Mykorrhiza sowie die Entwicklung des wurzelexternen Myzels bei Kartoffel (Solanum tuberosum) Organic Eprints
Scharfy, Deborah; Raupp, Dr Joachim; Neumann, Elke.
In the present study, AMF root colonisation of potato plants was compared between organically and minerally fertilised field plots, which did not significantly differ in the total amount of plant available P. The AMF root colonisation was increased in response to organic fertilisation. This indicates that organic fertilisation can enhance AMF development independently from the soil P fertilisation level. Furthermore, soil grown mycelium was trapped in fungal compartments. This technique allowed the extraction and quantification of coarse and finely branched soil grown hyphae after harvest. The soil in the fungal compartments was either fertilised with low or with high amounts of mineral P. In organically fertilised field plots, the amounts of finely...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Soil biology; Composting and manuring.
Ano: 2005 URL: http://orgprints.org/3679/1/3679.pdf
Imagem não selecionada

Imprime registro no formato completo
Der Einfluss symbiotischer Bodenpilze auf den Stickstoffzyklus Organic Eprints
Bender, Franz; Conen, Franz; Neftel, Albrecht; Oberholzer, Hans-Rudolf; Olbrecht, Luise; Jocher, Markus; Rollog, Mark; van der Heijden, Marcel G.A.
To increase nutrient use efficiency and reduce nutrient losses are key aspects for sustainable agriculture. Arbuscular mycorrhizal fungi (AMF) are an import and widespread group of plant-symbiotic soil fungi. Here we investigate the role of those soil microorganisms, for effective nutrient recycling. We conducted greenhouse and lysimeter experiments to compare the cycling of important plant nutrients in systems with high and low abundance of AMF. AMF increased plant N nutrition, reduced leaching losses of mineral N, and prevented emissions of N2O, an important greenhouse gas. The results show the importance of AMF for an effective nutrient management. Farmers should implement strategies to promote AMF in the soil, as they are an indispensable compound of...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil biology; Nutrient turnover; Air and water emissions.
Ano: 2013 URL: http://orgprints.org/21514/1/21514_Bender.pdf
Imagem não selecionada

Imprime registro no formato completo
Der Zusammenhang von Aminosäurenstoffwechsel im Boden und Humusniveau im Darmstädter Düngungsversuch Organic Eprints
Scheller, Dr Edwin; Raupp, Dr Joachim.
Since 1980 a long-term experiment has been carried out to compare mineral fertilizers (MIN), composted manure (RM) and composted manure with application of biodynamic preparations (RMBD) at three different fertilizer application rates. The total C and N contents in the topsoil were significantly different between all three fertilizer types. 42.9 to 53.7 % of Nt was bound in 18 total hydrolysable protein amino acids (THAA) including asparagine and glutamine. Amino acid contents in the hydrolysates of the topsoil were significantly different according to fertilizer type: MIN < RM < RMBD. The higher contents in manure fertilized plots were observed even at the lowest rate of fertilizer application. This indicates that differences between the treatments...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil biology; Composting and manuring.
Ano: 2005 URL: http://orgprints.org/3583/1/3583.pdf
Imagem não selecionada

Imprime registro no formato completo
Determining deep root activity in arable fields by the core-labelling technique (CLT) Organic Eprints
Han, Eusun; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian.
Introduction: Deep roots have the potential to exploit plant resources otherwise inaccessible. The aim of this study was to develop a method, the Core-Labelling Technique (CLT), to measure root activity down to 2.5 m of soil depth under field conditions. Materials and Methods: Two stainless steel ingrowth-cores, 0.1 m in diameter and 0.55 m in length, were filled with soil labelled with nutrient tracers, i.e., LiCO3, CsCO3, Na2SeO4, RbCO3 and 15NH4Cl. The labelled cores were placed into an access-tube having openings at 1.0 m and 2.5 m of soil depth. They were kept under a lucerne (Medicago sativa) crop for 60 days, after which, the root length density (RLD) and concentration of tracers in shoot biomass (including a control) were measured. Results:...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil biology; Nutrient turnover; Soil tillage; Farm nutrient management.
Ano: 2018 URL: http://orgprints.org/33942/1/Poster%20-%20Eusun_final.pdf
Imagem não selecionada

Imprime registro no formato completo
Development of collembolans after conversion towards organic farming Organic Eprints
Schrader, Stefan; Kiehne, Jahn; Anderson, Traute; Paulsen, Hans-Marten; Rahmann, Gerold.
In Northern Germany, a diverse and complex experimental farm of the Federal Agricultural Research Centre (FAL) was set-up in 2001 covering all main aspects of organic farming. Previously, the 600 ha farm had been managed conventionally. Adjacent conventional farms were used as reference. The aim of this project was to study collembolans, microbial biomass and soil organic carbon in six organically farmed fields managed as a crop rotation of six different crops compared with an adjacent conventionally managed field. We hypothesized that the specific management in organic farming promotes soil biota. Soil samples were taken during the growing season in 2004. Collembolan abundances and microbial biomass were lower under organic management, but, generally,...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil biology; Biodiversity and ecosystem services.
Ano: 2006 URL: http://orgprints.org/9310/1/ABB06_Collembolans.pdf
Imagem não selecionada

Imprime registro no formato completo
Dezente Helfer im Untergrund - Bodenlebewesen reduzieren Nährstoffauswaschung im Ackerbau Organic Eprints
Denzler, Lukas.
Weniger Bodenbearbeitung im Ackerbau schont die Böden und fördert die Bodenlebewesen. Das zahlt sich offenbar aus ökonomisch wie ökologisch.
Tipo: Newspaper or magazine article Palavras-chave: Soil biology; Soil tillage.
Ano: 2015 URL: http://orgprints.org/28139/1/NZZ_LukasDenzler-Bodenbiologie.pdf
Imagem não selecionada

Imprime registro no formato completo
Distribuição espacial de Procornitermes sp. (Isoptera: Termitidae) em função das propriedades físicas do solo em área de pastagem no município de São Borja, Rio Grande do Sul. Organic Eprints
Dias, Naymã Pinto; Medeiros, Leticia Ramon; Pazini, Juliano de Bastos; Silva, Fernando Felisberto da.
Os cupins pertencentes ao gênero Procornitermes são comumente encontrados em áreas de pastagem e a sua presença têm sido associada a situações de desequilíbrio ambiental e qualidade física do solo. Um conhecimento importante sobre a ocorrência destes cupins é o da distribuição espacial, essencial para o desenvolvimento de planos de amostragens e previsões de ocorrência. O objetivo deste trabalho foi verificar a dispersão e distribuição espacial de cupinzeiros em área de pastagem na Fronteira Oeste, associando-as às propriedades físicas do solo. Foram efetuadas amostragens para a determinação do número total de cupinzeiros existentes na área. Realizou-se análise física do solo, a determinação do gênero de cupim predominante e o cálculo da distribuição das...
Tipo: Journal paper Palavras-chave: Pasture and forage crops; Soil biology; Soil.
Ano: 2012 URL: http://orgprints.org/22930/1/Dias_Distribui%C3%A7%C3%A3o.pdf
Imagem não selecionada

Imprime registro no formato completo
Distribution, Abundance and Diversity of Fungal Entomopathogens: Foundations for Conservation Biological Control Organic Eprints
Meyling, Nicolai V..
Conservation biological control (CBC) is a pest management strategy in which farming management practices are adopted to enhance the living conditions for specific natural enemies of pests with the specific objective to suppress pest populations. Research in CBC strategies have mostly focused on provisioning of good living conditions for arthropod predators and parasitoids, usually ignoring entomopathogens as regulators of pest populations. Fungal entomopathogens are widespread in agro-ecosystems and infect a range of arthropod pests, and these fungi should therefore also be included in CBC. Knowledge of the ecology of indigenous populations of fungal entomopathogens is a prerequisite for the evaluation of their contributions to pest control and for...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil biology; Biodiversity and ecosystem services.
Ano: 2010 URL: http://orgprints.org/17403/4/17403.pdf
Imagem não selecionada

Imprime registro no formato completo
Distribution patterns of fungal entomopathogens in soil habitats: Natural occurrence, diversity and dynamics Organic Eprints
Meyling, Nicolai V..
Fungal entomopathogens are seemingly ubiquitous in soils. An increasing number of surveys around the world have shown that ascomycete fungi from the Hypocreales can be isolated from soils of many habitats. Based on morphological characteristics of the fungi some patterns of distribution have emerged. However, recent developments in molecular characterization of entomopathogenic fungi have revealed significant new insights into the distribution of genetic groups of some taxa, including Beauveria spp, and possible restrictions to certain habitats. I will present and discuss some of these distribution patterns and include new findings which indicate that some fungi are restricted to underground lifestyles while others cycle between below- and aboveground...
Tipo: Conference paper, poster, etc. Palavras-chave: Surveys and statistics; Soil biology; Biodiversity and ecosystem services; Soil tillage.
Ano: 2009 URL: http://orgprints.org/16056/2/16056.pdf
Imagem não selecionada

Imprime registro no formato completo
Diversidade de fungos micorrízicos arbusculares (Glomeromycota) ao longo de perfis de solo em áreas de cerrado e mata atlântica, Sete Lagoas, Minas Gerais. Repositório Alice
JOBIM, K.; ARAUJO, S. N.; COSTA, T. C. C.; SOUZA, F. A.; GOTO, B. T..
Tipo: Parte de livro Palavras-chave: Biologia do solo; Micorriza; Taxonomia; Soil biology; Mycorrhizae; Taxonomy.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/997250
Imagem não selecionada

Imprime registro no formato completo
Diversity and density of springtails (Collembola) in grass-clover ley in North-west Norway Organic Eprints
Pommeresche, Reidun; Løes, Anne-Kristin.
The diversity and density of springtails (Collembola) were studied in an organically managed grass-clover ley at Tingvoll experimental farm in NW Norway during 2011–2012. In total after one sampling in 2011 and 3 samplings in 2012, 42 species were identified. Our results included a new species for the Norwegian fauna, Onychiurus edinensis (Bagnall, 1935) and one species very unusual to agricultural soils, Oligaphorura ursi (Fjellberg, 1984). The most abundant species was Parisotoma notabilis (Schäffer, 1896), followed by three species of Mesaphorura Börner, 1901, two species of Protaphorura Absolon, 1901 and Isotomurus graminis Fjellberg, 2007. A high number of P. notabilis has also been found in pastures in Iceland (Gudleifsson & Bjarnadottir 2008),...
Tipo: Journal paper Palavras-chave: Soil biology; Soil.
Ano: 2014 URL: http://orgprints.org/31239/1/Dens%20and%20div%20of%20springtails%20nje-vol61-no2-165-179-pommeresche-loes.pdf
Registros recuperados: 483
Primeira ... 123456789 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional