
Wenceslau Geraldes Teixeira- Dr. rer. nat
- Soil Physicist at Brazilian Agricultural Research Corporation (EMBRAPA)
Wenceslau Geraldes Teixeira
- Dr. rer. nat
- Soil Physicist at Brazilian Agricultural Research Corporation (EMBRAPA)
Soil water and solutes fluxes; Anthropic Soils (Amazonian Dark Earths); Soil Physical parameters (tropical soils)
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Introduction
graduate as Agricultural Engineer at the Federal University of Viçosa - Brazil (1989), master's at Agronomy from Federal University of Lavras - Brazil (1992). Dr. rer. nat. - Geoecology - from the University of Bayreuth - Germany (2001). Has experience in Agronomy, focusing on soil physics: characterization of physical properties; water and nutrient fluxes in tropical soils; Anthrosols; Amazonian Basin and Fatal Yellowing in Oil Palm (AF / PC ).
http://lattes.cnpq.br/4136381865367906
Current institution
Additional affiliations
January 1995 - present
Education
May 1998 - July 2001
March 1990 - December 1992
February 1985 - November 1989
Publications
Publications (415)
Anthrosols known as Amazonian Dark Earth (ADE) have borne witness to the intensification of sedentary patterns and the demographic increase in Central Amazon. As a result, a recurring pattern has been observed of mounds with ADE arising from domestic activities and the disposal of waste. The objective of this research was to demonstrate the relatio...
Determination of hydraulic properties may be required to solve many questions in agriculture and environmental research. Hydraulic properties are spatially and temporally variable, consequently, reliable soil hydraulic characterization is complex and time-consuming. Furthermore, many hydraulic properties are better represented by functions (i.e., u...
Solo Modificado pelo Homem (Solo Antrópico) como Artefato Arqueológico. Wenceslau Geraldes Teixeira e Ricardo Arcanjo de Lima. In: Anais do IV Seminário Preservação de Patrimônio Arqueológico. p.123 - 147. Organização: Guadalupe do Nascimento Campos e Marcus Granato — Rio de Janeiro: Museu de Astronomia e Ciências Afins, 2016. 457p. ISBN: 978-85-60...
This book contains seventeen chapters discussing the economic and biological aspects of soil use and research in agroforestry, with an emphasis on nutrient-poor forest and savanna soils. Topics covered include the economics of soil fertility management, cycling of water, nutrients and organic matter, soil structure, soil water, root systems, soil b...
Soil saturated hydraulic conductivity (Ksat) and steady-state infiltration rate (SSIR) are essential and necessary soil properties for different geoscience applications. Values of these hydraulic properties for the Brazilian territory are difficult to access and are dispersed in research efforts carried out around the country. This study developed...
O estudo visa avaliar a confiabilidade de funções de pedotransferência (PTFs) para estimar a umidade do solo no ponto de murcha permanente (PMP) em solos do sul do Mato Grosso do Sul, num sistema hierárquico, utilizando valores de PMP em função do grupamento textural e da classe de solo. Coletou-se dados de PMP, granulometria, densidade do solo e t...
Agroforestry systems (AFSs) are known to store more carbon and nitrogen in the soil when compared with monocultures. However, studies involving carbon and nitrogen in soil aggregates in oil palm plantations, an important global commodity, in AFSs and monocultures are still scarce. Therefore, the objective of this study was to examine whether oil pa...
Biochar is the solid carbonaceous product of biomass pyrolysis. The properties of biochar depend on the biomass feedstock as well as the pyrolysis temperature and time. Therefore, biochars with different properties and functionalities can be produced. Biochar research has been intensive in the past 15 years, focusing mainly on soil applications, wa...
Objective: To estimate the water volumes of the main components of BH in a Haplic Cambisol in forests and pastures in the Bonfim River basin, mountainous region of RJ. Theoretical framework: The water balance (BH) accounts for the volumes of water input and output in a given space (Haplic Cambisols under forests and pastures). Method: The study per...
Many anthropogenic soils, often referred to as red bed or purple soils, are distributed in various areas of southern China. Purple soils typically are highly weathered and often lead to natural and engineering hazards because of their relatively poor water retention properties. Knowledge of the unsaturated soil hydraulic properties of purple soils...
Bulk density (BD) is a soil physical property used as a soil quality indicator and variations in this measurement influence soil water content and carbon stock estimates. This study aims to compile a database of samples of bulk density, textural fractions, and organic carbon values, as well as evaluate the accuracy of published pedotransfer functio...
Theoretical framework: Bulk density (Bd) is a physical property of soil used as an indicator of soil compaction, influencing root growth and density, water movement and retention in the soil, it is an essential characteristic for assessments of carbon stocks or other nutrients in the soil. Objective: This studyevaluates the accuracy and selects ped...
O conhecimento do uso da terra é cada vez mais importante, principalmente para a manutenção das atividades de conservação das características naturais em ambientes urbanizados. O Jardim Botânico do Rio de Janeiro (JBRJ) está situado no município do Rio de Janeiro, tendo uma parte de sua área com cobertura de formação vegetal natural e parte antropi...
As mudanças climáticas estão causando uma série de impactos ambientais, incluindo eventos climáticos extremos, como chuvas intensas e inundações. Os jardins de chuva são uma solução de infraestrutura verde que podem ajudar a mitigar os impactos desses eventos extremos. Este artigo propõe os jardins de chuva como ferramenta de adaptação urbana às co...
Fertile soil known as Amazonian dark earth is central to the debate over the size and ecological impact of ancient human populations in the Amazon. Dark earth is typically associated with human occupation, but it is uncertain whether it was created intentionally. Dark earth may also be a substantial carbon sink, but its spatial extent and carbon in...
Atualmente, é possível observar eventos hidrológicos extremos cada vez mais frequentes na cidade do Rio de Janeiro, esses eventos causam grandes transtorno a cidade. Isso é devido aos diversos fatores contribuintes, destacando-se falhas no planejamento urbano que, consequentemente, estão associados às modificações na bacia hidrográfica e nos compon...
As formas de relevo dos estados de Goiás e Tocantins notabilizam-se por uma alternância de extensos planaltos desdobrados em distintos níveis altimétricos com vastas depressões interplanálticas. Os planaltos são dominantes no estado de Goiás e constituem alguns dos mais notáveis exemplares do Planalto Central Brasileiro. As depressões interplanálti...
The Brazilian Amazonia region can be conveniently separated into 11 sectors, which represent large pedoenvironments at a continental scale. In a global panorama of the region, from this simplified and useful division, there is a high pedodiversity in the Amazon, despite the predominantly monotonous landforms, at macroscale. Soils of the Sedimentary...
NEVES, M. L. S. das; TEIXEIRA, W. G.; REIS, A. M. H. dos; ARAUJO FILHO, J. C. de; LUMBRERAS, J. F.; SHINZATO, E.; MONTEIRO, J. E. B. de A. Estimativas da água disponível no solo por meio de equação de pedotransferência e de valores tabelados por classes de solo na área do roteiro da RCC de Goiás e Tocantins. In: SANTOS, G. G.; OLIVEIRA, V. A. de; L...
TEIXEIRA, W. G.; REIS, A. M. H. dos; PIMENTEL, L. G.; VALLE, L. G. de F.; LUMBRERAS, J. F.; CERNICCHIARO, G. R. C.; SHINZATO, E. Avaliação da susceptibilidade magnética e da condutividade elétrica aparente dos perfis da XIV Reunião Brasileira de Classificação e Correlação de Solos - RCC de Goiás e Tocantins. In: SANTOS, G. G.; OLIVEIRA, V. A. de; L...
TEIXEIRA, W. G.; MARTINS, A. L. da S.; PIMENTEL, L. G.; REIS, A. M. H. dos; VALLE, L. G. de F.; SANTOS, G. D. dos; PEREIRA, C. M. M.; LUMBRERAS, J. F. Avaliação e estimativas dos teores de água retida a 1500 kPa (ponto de murcha permanente) em amostras dos horizontes de solos dos perfis da XIV Reunião Brasileira de Classificação e Correlação de Sol...
Human-landscape interactions have influenced the carbon cycle in numerous ways since the industrial revolution, but the role of human activities in the ancient world is less well known. One example is the Amazon region, one of the most important terrestrial carbon reservoirs, where the size of ancient human populations and the extent of their impac...
A economia verde, a agricultura regenerativa e o reconhecimento da importância de preservar o solo e água tem sido debatida e gerado políticas públicas que demandam um contínuo avanço do conhecimento do comportamento da água no solo e a da quantificação dos componentes do balanço hídrico, em diferentes sistemas de uso da terra.Os estudos que compõe...
Os estudos de modelagem para avaliação da recarga dos aquíferos são essenciais à gestão dos recursos hídricos. A vulnerabilidade das águas subterrâneas constitui uma preocupação na ilha de São Luís (MA), onde a salinização pela intrusão da água do mar nos aquíferos pode estar associada à sobre extração de água subterrânea e redução dos níveis do aq...
Pasturelands, often degraded, represent most of the converted lands globally. Here we present the results from a field experiment in Brazil where we tested the impact of different soil enhancers on soil quality and productivity of three tropical forages grasses: Brachiaria (Syn. Urochloa) brizantha cv. Marandu, Brachiaria brizantha cv. BRS Piatã, a...
This study provides the first survey of Brazilian magnetic susceptibility (MS) data from varying archaeological and geological contexts, including open‐air sites, quartzite, and limestone rockshelters, and Amazonian dark earths. Our MS analyses associated with archaeological findings allow us to propose MS values as proxies of intense anthropogenic...
The deforestation of tropical forests raises environmental concerns worldwide. Removing the pristine forest impacts the soil, consequently affecting the environmental services it provides. Within this context, the main goal of this study was to determine how the conversion of the tropical rainforest to pasture affects soil fertility across an exten...
Workshop para treinamento na avaliação da velocidade da infiltração básica no solo (VIB) com os métodos do Single Ring e Infiltrometro de Cornell (infiltracao e escoamento superficial).
Avaliação da condutividade hidráulica saturada (Ksat) com permeametro de Guelph.
Obtencao dos dados no campo e cálculos para obtencao do VIB e Ksat.
Agroforestry systems (AFSs) with oil palm are expected to have better soil quality than monocultures of this crop. The variation in soil physical quality between oil palm management zones is related to carbon input and is well known in monocultures, but poorly studied in oil palm AFSs. Here we determined whether management practices change the carb...
Apresentação dos resultados publicados no Boletim 272 sobre uma nova proposição de estimativa da água disponível no solo através de uma Equação de Pedotransferência (PTF) usando como preditores: Areia, Silte e Argila
TEIXEIRA, W. G.; VICTORIA, D. de C.; BARROS, A. H. C.; LUMBRERAS, J. F.; ARAUJO FILHO, J. C. de; SILVA, F. A. M. da; LIMA, E. de P.;...
For sustainable production systems, the nonuse of fire (where there is a greater loss of soil nutrients), would be a solution for the conservation of nutrients in the soil, with the use of management by cutting and grinding, introduction of AFSs (agrofor-estry systems), and maintenance of riparian vegetation. The concentrations of carbon and nutrie...
Informações de água disponível (AD) no solo são utilizadas frequentemente na modelagem de risco agroclimático do Brasil, periodicamente atualizada no programa de Zoneamento Agrícola de Risco Climático (Zarc). A fim de disponibilizar informações mais acuradas de AD para todo território nacional visando melhorias na modelagem do Zarc e outras aplicaç...
The Baixada Maranhense region is located in northeastern Brazil in the Maranhão state. Is an interior plain with around 6266 km2. It comprises hydrophilic floodplain fields, halophilic mangroves, muddy tidal plains. Gleysols (Solonetz) and Vertisols are the dominant salt-affected soils. The natural vegetation is a hygrophilous tropical (Dantas et a...
O objetivo deste documento é identificar um conjunto de sinais e tendências para a Ciência do Solo no horizonte 2030, consolidados em megatendências. São apresentadas as principais forças de mudanças que impulsionam importantes transformações do mundo e da agropecuária, bem como seus impactos sobre o futuro da Ciência do Solo.
The emissions of two greenhouse gases (GHG), carbon dioxide (CO2) and nitrous oxide (N2O), from six sub-strates with different carbonaceous content were compared in short and long-term incubation experiments. Three natural soils and three artificial chars were mixed with carbon (C) poor soil (Cambisol) to simulate real conditions after application...
O conhecimento da quantidade de água
da chuva que percola e recarrega os aquíferos das
bacias hidrográficas é essencial para gerenciar os
recursos hídricos. O objetivo do estudo foi calcular o
balanço hídrico da bacia hidrográfica do Bonfim,
situado no município de Petrópolis-RJ, ambiente
geológico que necessita ser investigado. Simulou-se
o fluxo...
RESUMO A representatividade da amostragem é fundamental para embasar a tomada de decisão, uma vez que a heterogeneidade da matriz é o principal fator para incerteza dos dados nos estudos de gerenciamento de áreas contaminadas. Neste estudo, coletaram-se 112 amostras de solo superficial em malha quadrada de 1 x 1 m, em uma área 15 x 6 m, no campus r...
Determination of Potassium Delay and Dispersion Factors in
Latossolo Amarelo very Clayey Kaolinitic
HASHIMOTO, C., TEIXEIRA, W., ENCINAS, O., & TAVARES, S. D. L. (2021). Determinação dos fatores de retardamento e dispersão de potássio em Latossolo Amarelo de textura muito argilosa.-Boletim de Pesquisa e Desenvolvimento v. 277. Embrapa Solos. Rio d...
Fatal yellowing disease (FY) is a bud rot-type disease that severely affects oil palm plantations in Latin America. Since 1974, when it was first reported in Brazil, this disorder has been responsible for severe economic losses in the oil palm industry; and, for nearly 50 years, several studies have tried to identify its causal agent, without succe...
Amazonian rainforests, once thought to be pristine wilderness, are increasingly known to have been widely inhabited, modified, and managed prior to European arrival, by human populations with diverse cultural backgrounds. Amazonian Dark Earths (ADEs) are fertile soils found throughout the Amazon Basin, created by pre‐Columbian societies with sedent...
Palestra para o curso de museologia da Unirio. O solo modificado pelo homem, é apresentado com um artefato cultural. Um artefato arqueológico.
Prediction of Available Water Capacity Based on Granulometry for Use in Risk Analysis in Agricultural Climate Risk Zoning
The predictions of water storage capacity and in the soil is essential for studies of agricultural production risks, in crop production simulation models and irrigation management. However, direct measurements of available soil...
Advancing extensive cattle production is a major threat to biodiversity conservation in Amazonia. The dominant vegetation cover has a drastic impact on soil microbial communities, affecting their composition, structure, and ecological services. Herein, we explored relationships between land-use, soil types, and forest floor compartments on the prok...
Amazonian Dark Earths (ADEs) are highly fertile soils in areas with predominance of unfertile soils. However, the variation in nutrient availability between regions and the resilience of ADEs to modern agricultural use is still little known, particularly regarding micronutrient contents. Hence, the present study synthesized current information of A...
Soil ecosystem service (SES) approaches evidence the importance of soil for human well-being, contribute to improving dialogue between science and decision-making and encourage the translation of scientific results into public policies. Herein, through systematic review, we assess the state of the art of SES approaches in tropical regions. Through...
Soil ecosystem service (SES) approaches evidence the importance of soil for human well-being, contribute to improving dialogue between science and decision-making and encourage the translation of scientific results into public policies. Herein, through systematic review, we assess the state of the art of SES approaches in tropical regions. Through...
Soil ecosystem service (SES) approaches evidence the importance of soil for human well-being, contribute to improving dialogue between science and decision-making and encourage the translation of scientific results into public policies. Herein, through systematic review, we assess the state of the art of SES approaches in tropical regions. Through...
First described over 120 years ago in Brazil, Amazonian Dark Earths (ADEs) are expanses of dark soil that are exceptionally fertile and contain large quantities of archaeological artefacts. The elevated fertility of the dark and often deep A horizon of ADEs is widely regarded as an outcome of pre-Columbian human influence. Controversially, in their...
Archaeological research provides clear evidence that the widespread formation of Amazonian Dark Earths (ADEs) in tropical lowland South America was concentrated in the Late Holocene, an outcome of sharp demographic growth that peaked towards 1000 BP. In their recent paper, however, Silva et al. propose that the high fertility of ADE is not of anthr...
Advancing extensive cattle production shifts the forest landscape and is considered one of the main drivers against biodiversity conservation in the Brazilian Amazonia. Considering soil as an ecosystem it becomes vital to identify the effects of land-use changes on soil microbial communities, structure, as well as its ecological functions and servi...
ADE, a result of domestic, economic, and agricultural activities in and around human settlements, are noted for their extraordinary fertility and resilience and for the significant quantities of organic carbon, much in the form of charcoal. The deepest and most extensive areas of ADE are generally located on the bluffs of major rivers adjacent to f...
A susceptibilidade magnética (SM) e a condutividade elétrica aparente (CEa) são propriedades dos minerais, da matéria orgânica e solutos do solo, cujos dados vêm sendo cada vez mais usados na ciência do solo, principalmente na agricultura de precisão, por intermédio de estimativas indiretas com atributos de interesse
agronômico como teores de argil...
O termo sambaqui é utilizado para caracterizar um tipo específico de assentamento, cuja grafia origina-se da língua tupi, em uma combinação dos termos Tamba, que significa concha, e ki que significa amontoado, monte. Trata-se de remanescentes da presença humana com um forte caráter para a modificação da paisagem pela agregação de diferentes materia...
A infiltração, a condução e a retenção de água no solo (esta última apresentada em detalhes no Capítulo 14 deste Guia de Campo) são fatores essenciais para o entendimento do balanço hídrico de uma região. Há um grande esforço mundial para se
obter e disponibilizar essas informações do solo (Rahmati et al., 2018).
A água proveniente de eventos de pr...
A avaliação da capacidade de retenção de água de um solo é um componente essencial para a avaliação de
sua aptidão agrícola e orientação do manejo mais adequado, assim como em estudos de modelagem hidrológica,
da produtividade de cultivos e em estudos geotécnicos e ecológicos de distribuição da vegetação. Valores obtidos das umidades de determinado...
The unsaturated hydraulic properties provide important theoretical and practical information about fluid flow in soils and rocks for a range of soil, environmental and engineering applications. In this study we used the evaporation (HYPROP) and chilled-mirror dew point (WP4C) methods to estimate the water retention and unsaturated hydraulic conduct...
Studies on the influence of leaf temperature rise on gas exchange in tropical tree species grown in plantations are rare. With regard to the predicted increase in air temperature in the future in the Central Amazon, we investigated the influence of increasing leave temperature on the gas exchange of oil palms cultivated in monocultures as well as i...
Apresentação sobre o conhecimento das marcas antrópicas, nas mudanças na paisagem, vegetação e principalmente nos solos em tres sitios arqueológicos (geoglifos, zanjas, earthworks) no estado do Acre - Brazil
A espectroscopia de fluorescência de raios X é uma técnica analítica onde raios X são usados para excitar os átomos dos elementos presentes nas amostras em análise. O pXRF está bem disseminado na comunidade científica, por sua habilidade em determinar elementos químicos O uso do
pXRF apresenta vantagens como: facilidade de operação e simplicidade n...
Mapping soil properties, using geostatistical methods in support of precision agriculture and related activities, requires a large number of samples. To reduce soil sampling and measurement time and cost, a combination of field proximal soil sensors was used to predict and map laboratory-measured soil properties in a 3.4-ha pasture field in southea...
ABSTRACT Chemical soil analysis data can be expressed by weight (i.e., gravimetric basis) or volume (i.e., volumetric basis) of the fine earth (sieved ≥2 mm), resulting in different units, cmolc kg-1 and cmolc dm-3, respectively. The research problem is that the difference between methods to express the same soil properties hinders the comparison o...
A densidade do solo inteiro (DSI), também conhecida como densidade aparente e densidade do solo, é uma medida da massa seca do material do solo contido em determinado volume de solo. Esse material do solo inclui todas as frações dos componentes de origem mineral e orgânica do solo. No FEBR, o código de identificação da densidade do solo inteiro é d...
Amazonian Dark Earths (ADEs) are soils studied for archaeological purposes and as a potentially agricultural model for the humid tropic. We investigated the chemical composition of an ADE in comparison to an adjacent Ultisol without anthropic influence for better understanding the origin of ADE fertility and formation process. Three hundred ADE and...
Spatial soil data applications require sound geospatial data including coordinates and a coordinate reference system. However, when it comes to legacy soil data we frequently find them to be missing or incorrect. This paper assesses the quality of the geospatial data of legacy soil observations in Brazil, and evaluates geospatial data sources (surv...
Characterization of Biochar Samples of Banana Peels and Orange Bagasse Carbonized at 400 and 600°C
Abstract: Biochar is a product of the pyrolysis of organic waste with potential use in agriculture. Its use depends on its physico-chemical properties, which vary according to the biomass and the pyrolysis
process. Agroindustry that processing orange...
Apresentam-se resultados preliminares de programa de pesquisa que tem como objeto o patrimônio cultural produzido ou transformado no primeiro cinquentenário (1808-1858) do Jardim Botânico do Rio de Janeiro (JBRJ). Erigido a partir dos escombros de um engenho de açúcar às margens da Lagoa Rodrigo de Freitas, subúrbio rural tão antigo quanto a própri...
In order to increase oil recovery from a reservoir, it is important to analyse adequate petrophysical description of rocks at different scales and perspectives. As large-scale tests demand time and are highly costly, being able to mimic field properties from laboratory measurements has shown to be a promising and feasible alternative in terms of re...
A Geografia Física do estado do Tocantins caracteriza-se por um predomínio de vastas superfícies aplainadas posicionadas em cotas modestas, e por vezes, interrompidas por extensos alinhamentos serranos. Tais superfícies de aplainamento apresentam um leve caimento regional de sul para norte e truncam um diversificado conjunto de unidades litológicas...
A susceptibilidade magnética (SM) e a condutividade elétrica aparente (CEa) são propriedades dos minerais do solo e da matéria orgânica. O uso de dados de SM e da CEa vem crescendo na ciência do solo, principalmente em aplicações na agricultura de precisão com estimativas indiretas, por equações de regressão, e atributos do solo de interesse agronô...
Esta apresentação faz parte de uma esforço de popularização da ciência e da ligação de livros de grande publico com a ciência dos acadêmicos.
Este é o terceiro evento neste sentido, que tem também o objetivo de trazer o publico e a discussão de volta as bibliotecas.
1- Fawcett
2- Rondon
2- Euclydes da Cunha (sim o nome original do escritor dos Se...
A agricultura brasileira tem aumentado a produção de alimentos, fibras, biocombustíveis e matérias primas através da adoção de novas tecnologias. Maiores produtividades são acompanhadas também pela diminuição da pressão sobre novas áreas. Apesar desta realidade encontra-se na região Cetro-Oeste, vastas áreas pouco produtivas, geralmente ocupadas co...
Uso do psicrometro WP4C para determinação da umidade no ponto de murcha permanente (1500 kPa) em amostras de solos. Comparação entre os valores estimados pelo psicrometro e cameras de Richard em 133 amotras de solos.
Unsaturated hydraulic conductivity in light textured soils in western Bahia
Study about the anthropic footprint in the archeological sites called Geogliphs in western Brazilian Amazon - Acre State.
Accurate and reliable measurements of field-saturated hydraulic conductivity (Kfs) are essential for accurate determinations of soil and solution water fluxes. Kfs is a crucial parameter to design drainage, irrigation systems and many other environmental, agricultural and industrial installations Reynolds et al. (1983). There is a high demand for K...
A infiltração, transmissão e retenção de água no solo são fatores essenciais para o entendimento do balanço hídrico numa região. A água proveniente de eventos de precipitação que incidem em determinado local, em sua grande parte infiltra e percola no solo sendo responsável pela recarga do(s) aquíferos e fonte das águas superficiais. Dentre os métod...
Amazonian dark earths (ADEs) are fertile soils created by pre-Columbian Amerindian societies of the Amazon Basin. However, it is still not clear whether these soils were produced intentionally to improve infertile Amazonian upland soils or if they resulted from the accumulation of organic matter from sedentary settlements. This study characterizes...
Amazonian Dark Earths (ADE) are anthropic soils that are enriched in carbon (C) and several nutrients, particularly calcium (Ca) and phosphorus (P), when compared to adjacent soils from the Amazon basin. Studies on ADE empower the understanding of complex pre-Columbian cultural development in the Amazon and may also provide insights for future sust...
Amazonian Dark Earths (ADEs) are fertile anthropic soils found throughout Amazonia, resulting from long-term occupation by pre-Columbian societies. Although the chemistry of these soils is well known, their biodiversity, particularly soil invertebrate communities have been neglected. To address this, we characterised soil macroinvertebrate communit...
Biochar studies for environmental applications becoming more and more widespread. Biochar of banana peel (BPB) and orange bagasse (OBB) produced at 400 and 600 °C were characterized and studied the sorption of the ammonium from a landfill leachate and monosolution. The characterization show a alkaline pH for all biochars produced. The BPB shows hig...
A expansão da área ocupada pela cultura de cana-de-açúcar na região Centro-Sul ocorre prioritariamente com uso intensivo da terra, por meio da adoção do plantio e da colheita mecanizados em decorrência da erradicação da queima da biomassa ou palhada. Nessas áreas de expansão predominam solos de textura leve, definidos como sendo aqueles que apresen...
The knowledge of changes in the hydrological cycles in agroecosystems existing on a mountainous region in the northwestern of Rio de Janeiro is key factor to manage and
verify the suitability of land systems for a specific region. Simulation techniques has been development in order to describe the water, nutrients and productivities fluxes in
agroe...
RESUMO A Terra Preta de Índio (TPI) da Amazônia apresenta altos teores de nutrientes como fósforo e matéria orgânica. A TPI foi criada pela população ameríndia há aproximadamente 2500 anos. No entanto pouco se sabe sobre a qualidade biológica desse solo. Assim, o objetivo deste trabalho foi avaliar a qualidade do solo de TPI cultivada com feijão-ca...
Questions
Questions (12)
A question is if in a "normal soil" - never flooded the water pressure at zero or below.
May the soil water flows into the ceramic cup of a tensiometer?
I guess it is not possible because I do have always a hydraulic head inside the ceramic cup (if its filled of water).
Moreover, also in a situation where, momentaneously, water pressure is lower inside the ceramic cup (e.g after a strong rain in a dry period) than outside, it the pressure will be equilibrated quickly (i.e time response of tensiometer), and the hydraulic conductivity of the ceramic is too reduced to allow some identifiable flow.
Anyway - Maybe Im biased. If you do have any theoretical or practical ideas.
Please let me know.
Dear colleagues,
We are looking for specific (or global) PTF functions (with good performance in sandy soils) to estimate hydraulic properties (field capacity, permanent wilting point, available water)
The "sandy soils" we are studying are from the classes sand, loamy sand, sandy loam.
The predictive parameters we are thinking to use are particle size (coarse sand, fine sand, silt, clay, organic carbon, bulk density, CEC, soil types and maybe others)
If someone has worked with this topic. I thank you in advance for your suggestions.
Regards from Brazil
Wenceslau Teixeira
Embrapa Solos
Dear colleagues
We area trying to use the equations presented originally in the article of
Tuller, M., Or, D., 2005. Water films and scaling of soil characteristic curves at low water contents. Water Resour. Res. 41. ttp://dx.doi.org/10.1029/2005WR004142
and
Resurreccion, A.C., Moldrup, P., Tuller, M., Ferré, T.P.A., Kawamoto, K., Komatsu, T., de Jonge, L.W., 2011. Relationship between specific surface area and the dry end of the water retention curve for soils with varying clay and organic carbon contents. Water Resour. Res. 47. http://dx.doi.org/10.1029/2010WR010229
and
Maček, M., Mauko, A., Mladenovič, A., Majes, B., & Petkovšek, A. (2013). A comparison of methods used to characterize the soil specific surface area of clays. Applied Clay Science, 83, 144-152.
But we can not reproduce the results using the equations present in the articles. Maybe some of you do have experience with this topic and can help you. Our intent is to estimate specific surface from soil and biochar samples.
I thanks in advance any comments or suggestion
Regards
Wenceslau Teixeira
Embrapa Solos - Brazil
Dear folks
Is do have a way - facility in Research gate to export a citation of a publication ?
Cheers
Wenceslau