Consulta: subjectFacets:"Rainfall"
Registros recuperados: 59
Data/hora: 03/06/2024 06:34:33

Characterization of water availability in a hydrographic basin
Provedor de dados: 70
Autores: Arai,Fabiane K.; Pereira,Silvio B.; Gonçalves,Geula G. G.
The quantitative knowledge of hydrological parameters (rainfall and flow) and their spatial and temporal variability on the regions or basins should be understood as essential to the efficient planning and management of water resources. Because the Ivinhema Basin, located in the state of Mato Grosso do Sul, Brazil, represents an important inductor on the region agricultural development, characterized as a major producer of grains and meat, it was used to characterize the hydrological study. Knowing the rainfall, flow and drainage area of each of the studied affluent, it was calculated the proportion of contribution of the affluent. To that end, it was proposed the concepts of potential and real contributions, aiming to identify the proportion of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: River discharge; Water resources; Rainfall.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000300018

Estimation of climatological water deficit in an experimental watershed in the brazilian cerrado
Provedor de dados: 70
Autores: GOTARDO,JACKELINE T.; RODRIGUES,LINEU N.; GOMES,BENEDITO M.
ABSTRACT This study aimed to estimate the probability of climatological water deficit in an experimental watershed in the Cerrado biome, located in the central plateau of Brazil. For that, it was used a time series of 31 years (1982–2012). The probable climatological water deficit was calculated by the difference between rainfall and probable reference evapotranspiration, on a decennial scale. The reference evapotranspiration (ET0) was estimated by the standard FAO-56 Penman-Monteith method. To estimate water deficit, it was used gamma distribution, time series of rainfall and reference evapotranspiration. The adherence of the estimated probabilities to the observed data was verified by the Kolmogorov-Smirnov nonparametric test, with significance level...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gamma distribution; Penman-Monteith; Rainfall.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400631

CLIMATOLOGICAL WATER BALANCE WITH DATA ESTIMATED BY TROPICAL RAINFALL MEASURING MISSION FOR THE DOCE RIVER BASIN
Provedor de dados: 70
Autores: Louzada,Franciane L. R. de O.; Xavier,Alexandre C.; Pezzopane,José E. M.
ABSTRACT The Climatic Water Balance (CLIMWB) is very used in the climatic characterization and can also offer important contribution in the identification of the water demand for irrigation of a region. For this, reliable precipitation data with good spatial coverage is required. The Tropical Rainfall Measuring Mission satellite -TRMM-3B43-v7 is a partnership between NASA (National Aeronautics and Space Administration) and Japan's Aerospace Exploration Agency (JAXA), which estimates rainfall data for the tropics region. The aim of this study is to evaluate the CLIMWB obtained by the Thornthwaite &amp; Mather method (1955), with estimated rainfall data with the 3B43 product versus those generated with rainfall data and to map pixel-by-pixel water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orbital data; Rainfall; Water deficit; Water availability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000300376

Climate risk in maize crop in the northeastern of Brazil based on climate change scenarios
Provedor de dados: 70
Autores: Silva,Vicente de P. R. da; Campos,João H. B. da C.; Silva,Madson T.
This study evaluates the impacts of climate change on the agricultural zoning of climatic risk in maize crop cultivated in the Northeastern of Brazil, based on the Intergovernmental Panel on Climate Change (IPCC) reports. The water balance model, combined with geospatial technologies, was used to identify areas of the study region where the crops could suffer yield restrictions due to climate change. The data used in the study were the time series of rainfall with at least 30 years of daily data, crop coefficients, potential evapotranspiration and duration of the crop cycle. The scenarios of the increasing of air temperature used in the simulations were of 1.5ºC, 3ºC and 5ºC. The sowing date of maize crop from January to March appears to be less affected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Global warming; Water balance; Rainfall; Agricultural zoning.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600019

Macroinvertebrates under stochastic hydrological disturbance in Cerrado streams of Central Brazil
Provedor de dados: 76
Autores: Saito,Victor S.; Mazão,Gustavo R.
In the Cerrado vegetation, where the seasonal is well defined, rainfall has an important role in controlling the flow of streams and consequently on the structure of macroinvertebrates community. Despite the effects of rainfall associated with seasonality are well studied, little is known about the effects of stochastic rains on the community. In the present study we evaluated the structure and faunal composition of four first-order streams in Central Brazil during the dry season in two years, with and without stochastic rains. Community sampling was done by colonization of boards of high density polyethylene (HDPE), removed after one month submerged in streams. Analysis of Variance (ANOVA) performed indicated no difference in rarefied richness between the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rainfall; Faunal structure; Rarefied richness; Numeric density; Benthic fauna.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000400011

Estrategias para reducao dos efeitos do veranico em culturas de milho e soja, na regiao dos cerrados.
Provedor de dados: 14
Autores: CARVALHO, L. J. C. B. de; GOMIDE, R. L.; LUCHIARI JUNIOR, A.; RODRIGUES, G. C.
bitstream/item/99291/1/comtec-42.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Cultivo; Maize; Cultivation; Brasil; Rainfall; Savanna.; Balanço Hídrico; Climatologia; Cerrado; Deficiência Hídrica; Estiagem; Glycine Max; Milho; Produção; Produtividade; Redução; Soja; Zea Mays.; Veranico; Corn; Soybeans.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549331

Distribuição de probabilidades das chuvas mensais registradas na Estação do Perímetro irrigado de Bebedouro, Petrolina, PE.
Provedor de dados: 14
Autores: VALDIVIESO SALAZAR, C. R.
Dados mensais de chuva, procedentes da Estacao Agrometeorologica de Bebedouro, de 1963 a 1983, sao analisados com os seguintes tipos de distribuicao: empirica, log-normal e gamma. As chuvas mensais com 75% da probabilidade de excedencia de janeiro a dezembro sao: 20, 35, 68, 70, 4,4, 1,5, 0,0, 0,4 e 40 mm para cada mes respectivamente. A distribuicao gamma aproxima-se mais da distribuicao empirica do que a log-normal.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Distribuição; Pernambuco; Petrolina; Projeto Bebedouro; Rainfall; Distribution.; Chuva; Meteorologia.; Rain; Brazil; Meteorology.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133639

Dosagens de Diuron e Trifluoralina em algodoeiro herbaceo municipio de Iguatu, Ceara.
Provedor de dados: 14
Autores: BELTRAO, N. E. de M.; AZEVEDO, D. M. P. de; VIEIRA, D. J.; NOBREGA, L. B. da.
bitstream/item/33347/1/DOSAGEM.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Fitoxicidade; Efeito; Caroco; Brasil; Ceara; Iguatu; Fitotoxicity; Year; Effect; Rainfall; Seed; Yield.; Algodão; Herbicida; Gossypium Hirsutum; Precipitação Pluvial; Produção.
Ano: 1987
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/262796

O clima no Pantanal Mato-Grossense.
Provedor de dados: 14
Autores: CADAVID GARCIA, E. A.
O Pantanal Mato-grossense e uma planície de 139.111 km2, com altitude de 80 a 150 m e declividade de 2,5 a 5,0 cm.km-1 no sentido Norte-Sul. O clima da região e o resultado da localização geográfica tropical, do relevo e de esporádicas massas de ar frio do Sul do Pais. O regime pluviométrico e de verão e apresenta algumas variações quanto a intensidade e distribuição no ano, estimando-se, para o norte (Cáceres, MT), concentração de 82,4% nos meses de outubro a marco, com valores médios da chuva de 1.262 +_ 200 mm. Na parte intermediaria do Pantanal (Corumbá, MS), observa-se concentração menor (77,3% na Fazenda Nhumirim), com altura pluvial media de 1.022 +_ 113 mm. O "período de recorrência" das pluviométricas também apresenta variações entre sub-regiões....
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Climatologia agricola; Mato Grosso do Sul; Periodo de retorno; Rainfall; Flood; Cycles.; Clima; Chuva; Enchente; Temperatura.; Pantanal; Climate; Temperature.
Ano: 1984
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/787712

Chuvas intensas no estado de Mato Grosso.
Provedor de dados: 14
Autores: FIETZ, C. R.; COMUNELLO, E.; CREMON, C.; DALLACORT, R.; PEREIRA, S. B.
bitstream/item/53790/1/DOC2011104.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Precipitação; Distribuição Gumbel; Rainfall; Precipitation; Gumbel distribution.; Chuva.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/915074

Probabilidade de ocorrencia de chuva no Estado de Goias.
Provedor de dados: 14
Autores: SILVA, F. A. M. da; ASSAD, E. D.; LUIZ, A. J. B.; OLIVEIRA, A. C.
O conhecimento da probabilidade de ocorrencia de chuva pode ajudar no entendimento da variabilidade da precipitacao no tempo e no espaco, alem de servir como dado basico para a avaliacao do potencial de determinada regiao quanto a irrigacao e a obras de engenharia, tais como: dimensionamento de poentes e canais de captacao de aguas pluviais, bem como para o armazenamento de agua para o abastecimento. Com o objetivo de criar subsidios para o planejamento dessas atividades, principalmente daquelas relacionadas ao setor agricola, este trabalho apresenta valores de probabilidades de ocorrencia de chuva para 143 localidades do Estado de Goias. Para isso, os valores diarios observados das series pluviometricas, com no minimo 10 anos de dados, foram ajustados a...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Precipitacao; Brasil; Precipitation; Gama; Goiás; Probabilidade; Rainfall; Savanna.; Cerrado; Chuva; Meteorologia.; Brazil; Meteorology; Rain.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/554971

Application of a microbial source tracking based on bacterial and chemical markers in headwater and coastal catchments
Provedor de dados: 5
Autores: Jarde, Emilie; Jeanneau, Laurent; Harrault, Loic; Quenot, Emmanuelle; Solecki, Olivia; Petitjean, Patrice; Lozach, Solen; Cheve, Julien; Gourmelon, Michele.
This study identified sources of fecal contamination in three different French headwater and coastal catchments (the Justiçou, Pen an Traon, and La Fresnaye) using a combination of microbial source tracking tools. The tools included bacterial markers (three host-associated Bacteroidales) and chemical markers (six fecal stanols), which were monitored monthly over one or two years in addition to fecal indicator bacteria. 168 of the 240 freshwater and marine water samples had Escherichia coli (E. coli) or enterococci concentrations higher than “excellent” European water quality threshold. In the three catchments, the results suggested that the fecal contamination appeared to be primarily from an animal origin and particularly from a bovine origin in 52%...
Tipo: Text
Palavras-chave: Fecal contamination; Host-associated Bacteroidales markers; Fecal stanols; Rainfall; MST toolbox; Mitigation actions.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00395/50597/51548.pdf

Stygofaunal community trends along varied rainfall conditions: Deciphering ecological niche dynamics of a shallow calcrete in Western Australia
Provedor de dados: 5
Autores: Saccò, Mattia; Blyth, Alison J.; Humphreys, William F.; Karasiewicz, Stephane; Meredith, Karina T.; Laini, Alex; Cooper, Steven J.b.; Bateman, Philip W.; Grice, Kliti.
Groundwaters host highly adapted fauna, known as stygofauna, which play a key role in maintaining the functional integrity of subterranean ecosystems. Stygofaunal niche studies provide insights into the ecological dynamics shaping the delicate balance between the hydrological conditions and community diversity patterns. This work aims to unravel the ecological trends of a calcrete stygofaunal community, with special focus on niche dynamics through the Outlying Mean Index analysis (OMI) and additional calculation of Within Outlying Mean Indexes (WitOMI), under three rainfall regimes. Temperature and pH changed significantly among different rainfall conditions (P &lt; .001), and together with salinity were the most influential drivers in shaping stygofaunal...
Tipo: Text
Palavras-chave: Stygofauna; Ecological niche; Groundwater; Calcrete; Rainfall; WitOMI.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00599/71110/69806.pdf

Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr
Provedor de dados: 5
Autores: Pasquier, Virgil; Toucanne, Samuel; Sansjofre, Pierre; Dixit, Yama; Revillon, Sidonie; Mokeddem, Zohra; Rabineau, Marina.
In this study we use bulk sediment organic matter stable isotopes (δ13Corg and δ15N) to examine the nature and timing of preserved organic matter in borehole PRGL1-4 from Northwestern Mediterranean Sea. This region is known as a transitional zone between the North Atlantic atmospheric circulation and the North African monsoon system. In the Gulf of Lion (SE France), increased inputs of organic matter from sediment-laden rivers occurred during warm substages of the last 200 kyr (MIS 5e, 5c, and 5a; MIS 6d, and 6b). Increased terrestrial organic matter are inferred from organic carbon isotopic composition (δ13Corg), and are interpreted as resulting from enhanced rainfall over the Rhone river catchment area. Such increase in terrestrial organic carbon induced...
Tipo: Text
Palavras-chave: Mediterranean; Rainfall; North Atlantic oscillation; Organic matter; North Mediterranean borderland; Sapropel.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00473/58421/61116.pdf

SST Indexes in the Tropical South Atlantic for Forecasting Rainy Seasons in Northeast Brazil
Provedor de dados: 5
Autores: Hounsou-gbo, Gbekpo Aubains; Servain, Jacques; Araujo, Moacyr; Caniaux, Guy; Bourles, Bernard; Fontenele, Diogenes; Martins, Eduardo Savio P. R.
May-to-July and February-to-April represent peak rainy seasons in two sub-regions of Northeast Brazil (NEB): Eastern NEB and Northern NEB respectively. In this paper, we identify key oceanic indexes in the tropical South Atlantic for driving these two rainy seasons. In Eastern NEB, the May-to-July rainfall anomalies present a positive relationship with the previous boreal winter sea surface temperature anomalies (SSTA) in the southeast tropical Atlantic (20 degrees-10 degrees S; 10 degrees W-5 degrees E). This positive relationship, which spread westward along the southern branch of the South Equatorial Current, is associated with northwesterly surface wind anomalies. A warmer sea surface temperature in the southwestern Atlantic warm pool increases the...
Tipo: Text
Palavras-chave: Brazilian Northeast; Rainfall; Predictability; Tropical Atlantic.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00623/73547/73807.pdf

Tracking rainfall in the northern Mediterranean borderlands during sapropel deposition
Provedor de dados: 5
Autores: Toucanne, Samuel; Mintoo, Charlie Morelle Angue; Fontanier, Christophe; Bassetti, Maria-angela; Jorry, Stephan; Jouet, Gwenael.
The role of mid-latitude precipitation in the hydrological forcing leading to the deposition of sapropels in the Mediterranean Sea remains unclear. The new GDEC-4-2 borehole, East Corsica margin (northern Tyrrhenian Sea), provides the first precisely dated evidence for enhanced rainfall in the Western Mediterranean during warm intervals of interglacial periods over the last 547 kyr. Comparison of GDEC-4-2 proxy records with pollen sequences and speleothems from the central and eastern Mediterranean reveals that these pluvial events were regional in character and occurred probably in response to the intensification of the Mediterranean storm track along the northern Mediterranean borderlands in autumn/winter. Our dataset suggests that the timing of maxima...
Tipo: Text
Palavras-chave: Mediterranean; Rainfall; Interglacials; Sapropel.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00287/39804/38301.pdf

Sediment transport in the Bay of Marseille : Role of extrem events.
Provedor de dados: 5
Autores: Verney, Romaric; Jany, Cassandre; Thouvenin, Benedicte; Pairaud, Ivane; Vousdoukas, Michalis I.; Pinazo, Christel; Ardhuin, Fabrice; Cann, Philippe.
Human pressures on ecosystems have increased significantly over the last decades, and especially Mediterranean coasts are strongly impacted by the development of big cities and industrialized area, such as the Bay of Marseille. Prior to any investigations on ecological or contamination impacts, it was necessary to understand sediment dynamics and its response to natural extreme events such as storm or heavy rainfall events. In situ observations were dedicated to understand the behavior of bed sediments, and their spatial distribution. A benthic station was deployed for three months to observe the impact of extreme events on hydrodynamics and sediment dynamics in a critical zone of the study area. These measurementswere used to calibrate and validate the...
Tipo: Text
Palavras-chave: Sediment dynamics; Large coastal cities; Urban pressure; Extreme events; Wave; Rainfall; Marseille.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00204/31515/29929.pdf

Reproductive seasonality of Geophagus steindachneri Eigenmann &amp;amp; Hildebrand, 1922 (Perciformes: Cichlidae) in a tropical mountain river
Provedor de dados: 83
Autores: Rangel-Serpa,Federico; Torres,Mauricio.
Reproductive seasonality in tropical freshwater fishes is strongly influenced by rainfall. In lowlands, floods spill laterally to floodplains and fishes usually breed during the flooding season. In mountain rivers, floods are sudden and flush out aquatic organisms. Fishes in mountain rivers usually breed during dry seasons, what has been hypothesized as a strategy to reduce mortality due to strong floods. If that is the case, mouth-brooding fishes should suffer less from strong floods and should have more prolonged breeding seasons in mountain rivers. Here we investigated the breeding activity of a mouth-brooding cichlid (Geophagus steindachneri) in a mountain river in Colombia using three kinds of evidence: monthly variation of gonad weight, macroscopic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Limnology; Parental care; Phenology; Rainfall; Spawning.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200421

An analysis of natural factors of traffic accidents involving Yezo deer (Cervus nippon yesoensis)
Provedor de dados: 19
Autores: Kawata, Yukichika.
In Hokkaido, Japan, the number of Yezo deer (Cervus nippon yesoensis) has recently increased drastically, causing a large number of deer-vehicle traffic accidents. This paper examines conditions related to deer-vehicle traffic accidents by analysing the following relationships: time of accident and lunar phase; time of accidents and time of sunrise/sunset; likelihood of accidents and rainfall patterns, temperature and season (particularly snow and hunting seasons). The results suggest that the potential for deer-vehicle traffic accidents increases during hunting and non-snow seasons when there is little or no rainfall, just before sunrise or just after sunset, or during a full, first quarter, or third quarter moon. A statistically significant relationship...
Palavras-chave: Deer-vehicle traffic accidents; Hunting season; Lunar phase; Rainfall; Snow season; Sunrise/sunset; Temperature.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3079

Relación entre la temperatura superfiical del mar del Océano Pacífico Oriental y las precipitaciones en la costa del Ecuador
Provedor de dados: 20
Autores: Hernández, F.; Zambrano Quiñonez, E.
This paper establishes the existing relation between the field of the sea surface temperature and his anomalies with accumulated monthly of rainfall in each of the localities (total 7) of the coast of the Ecuador. For the effect there is in use information of the sea superficial temperature from the National Centers for Environmental Prediction (NCEP Climate Modeling Branch), and accumulated monthly of rain of the database of the Inocar during the period from 1981 to 2006, corresponding to the stations of the San Lorenzo, Esmeraldas, Manta, La Libertad, Guayaqui,. Puná and Pto. Bolívar. They fin a good coefficient of direct correlation between the sea surface temperature and the rain (from 0.5 to 0.85), nevertheless is ibserved that not the whole rain on...
Tipo: Journal Contribution
Palavras-chave: Surface temperature; Rainfall; Climate; Data collections; Climate; Rainfall; Http://aims.fao.org/aos/agrovoc/c_1665; Http://aims.fao.org/aos/agrovoc/c_13747.
Ano: 2009
URL: http://hdl.handle.net/1834/3345

Using Sea Surface Temperatures to Predict Seasonal Rainfall over East
Provedor de dados: 20
Autores: Bazira, E.
In East Africa (Uganda, Kenya and Tanzania) agriculture sector employs over 80% of the work force and export earnings from the sector constitute a major part of the national budgets. Subsistence farming is the major source of food. However food shortages as well as negative impacts on several sectors of the economies have been attributed to the seasonal weather variations among other factors. Therefore, the objective of this study was to determine the Long-Range prediction potential of seasonal rainfall as derived from SST modes of the neighboring oceans.
Tipo: Conference Material
Palavras-chave: Sea surface temperature; Rainfall.
Ano: 2000
URL: http://hdl.handle.net/1834/550

Implications of climate change on the management of Rift Valley lakes in Kenya. The case of lake Baringo
Provedor de dados: 20
Autores: Ngaira, Josephine K.
Climate patterns of the World became very variable during the last half of the twentieth century. Causes of this variability/change have been identified as: Sun Spot activity, ozone depletion, decline in the solar beam, with the more pronounced especially in Africa being Increased atmospheric carbondioxide, and albedo change due to anthropogenic factors. The most affected weather elements by the above mentioned factors particularly in the tropics are Rainfall and Temperature, and the climatic environments most affected by the named weather elements are the arid and semi-arid lands which are already moisture constrained. The rift valley in Kenya, where most of the lakes are located experience Arid and Semi-Arid climate. The lakes located in this region are...
Tipo: Proceedings Paper
Palavras-chave: Climatic changes; Resource management; Lake basins; Anthropogenic factors; Inland waters; Environmental impact; Water policy; Lake dynamics; Arid environments; Rainfall; Water resources.
Ano: 2006
URL: http://hdl.handle.net/1834/1472

Maize yield and rainfall on different spatial and temporal scales in Southern Brazil
Provedor de dados: 86
Autores: Bergamaschi,Homero; Wheeler,Timothy Robert; Challinor,Andrew Juan; Comiran,Flávia; Heckler,Bruna Maria Machado.
This study aimed to establish relationships between maize yield and rainfall on different temporal and spatial scales, in order to provide a basis for crop monitoring and modelling. A 16-year series of maize yield and daily rainfall from 11 municipalities and micro-regions of Rio Grande do Sul State was used. Correlation and regression analyses were used to determine associations between crop yield and rainfall for the entire crop cycle, from tasseling to 30 days after, and from 5 days before tasseling to 40 days after. Close relationships between maize yield and rainfall were found, particularly during the reproductive period (45-day period comprising the flowering and grain filling). Relationships were closer on a regional scale than at smaller scales....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Rainfall; Water deficit; Crop models; Critical period.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000500001

Weed emergence in autumn under temperate conditions
Provedor de dados: 87
Autores: Calado,J.M.G.; Basch,G.; Carvalho,M.
The emergence of weed plants depends on environmental conditions, especially temperature and soil moisture. The latter is extremely important in Mediterranean environments which are characterized by irregular amount and distribution of rain throughout the year, which influences the beginning of the growth cycle of the annual species (seed germination). This paper studies the influence of rainfall, in particular accumulated rainfall in autumn, on the emergence of weed plants. The experiment was carried out on Luvisols, and the appearance of flora under field conditions was observed. Through analysis of the results, it can be concluded that a high percentage of weed plants (&gt; 85% related to the highest registered value) was obtained with more than 90 mm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonal emergence; Mediterranean climate; Rainfall; Seed germination; Soil moisture.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000200012

INFLUENCE OF PRECIPITATION AND SUGARCANE STRAW IN AMINOCYCLOPYRACHLOR AND INDAZIFLAM CONTROL EFFICIENCY
Provedor de dados: 87
Autores: GUERRA,N.; OLIVEIRA JR,R. S.; CONSTANTIN,J.; OLIVEIRA NETO,A. M.; PUTON,G.; GARRIDO,T. H. P.
ABSTRACTThe raw sugarcane harvesting system has changed the dynamics of weed tillage for this crop, changing the predominant weed species and providing a barrier between the herbicide and the soil. Thus, this study has aimed to assess the influence of precipitation and sugarcane straw in the aminocyclopyrachlor and indaziflam herbicides control efficiency for the species Ipomoea trilobaand Euphorbia heterophylla. There were two trials, one for aminocyclopyrachlor and one for the indaziflam, both in the greenhouse at the campus of Faculdade Integrado in the Brazilian city of Campo Mourão, PR. Each experiment consisted of eight treatments with four replications. The treatments consisted of the combination of the presence of straw (10 t ha-1), capillary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mulching; Euphorbia heterophylla; Ipomoea triloba; Rainfall.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000300535

Is geographic diversification sufficient to limit contract grower risk?
Provedor de dados: 31
Autores: Geyser,   Mariette; Louw,   Andre; Botha,   L.
Lending and financial institutions have looked for a variety of ways to expand their portfolios into agriculture, but because of the risks associated with lending to farmers who lack traditional forms of collateral, they face price and yield risks, causing these inroads to be limited. Market-based instruments are readily available for price risk. Organised exchanges offering the most basic of these instruments, futures and options, have operated for a long time, providing transparency to the market and low-cost risk transfer tools for those able to access them. While the use of price risk management instruments is an incomplete solution, it has sufficient merits on its own and will make the overall burden of risk more bearable. The use of these instruments...
Tipo: Journal Article
Palavras-chave: Geographic diversification; Contract grower; Risk; Lending; Rainfall; Yield; Agricultural Finance.
Ano: 2009
URL: http://purl.umn.edu/49163

ECONOMIC AND ENVIRONMENTAL BENEFITS OF VARIABLE RATE APPLICATION OF NITROGEN TO CORN FIELDS: ROLE OF VARIABILITY AND WEATHER
Provedor de dados: 31
Autores: English,   Burton C.; Mahajanashetti,   S.B.; Roberts,   Roland K.
The use of meta-response functions based on EPIC-generated data resulted in comparisons between variable (VRAT) and uniform rate application technologies for 36 simulated fields.  VRAT was more profitable and less nitrogen was lost to the environment in most cases.   When spatial variability was small, uniform rate application techniques were adopted.   However, when nitrogen use is restricted, VRAT is used on all simulated fields.
Tipo: Conference Paper or Presentation
Palavras-chave: Precision farming; Site-specific farming; Spatial variability; Nitrogen restriction; Rainfall; EPIC; Crop growth simulation model; Meta-response functions; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Resource /Energy Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/21533

Using panel data to estimate the effect of rainfall shocks on smallholders food security and vulnerability in rural Ethiopia
Provedor de dados: 31
Autores: Demeke,   Abera Birhanu; Zeller,   Manfred.
Ethiopia's agriculture is predominantly rainfed and hence any irregularity in weather conditions has adverse welfare implications. Using panel data, this paper analyzes the effect of rainfall shocks on Ethiopian rural households' food security and vulnerability over time while controlling for a range of other factors. To this end, we generated a time-variant household food security index which is developed by principal components analysis. Based on the scores of the index, households were classified into relative food security groups and their socioeconomic differences were assessed. The exploratory results show that compared to the less secured households, the more secured ones have male and literate household heads, tend to have a greater number of...
Tipo: Working or Discussion Paper
Palavras-chave: Food security; Principal components analysis; Rainfall; Panel data; Ethiopia; Food Security and Poverty; Research Methods/ Statistical Methods; Q18; C13.
Ano: 2009
URL: http://purl.umn.edu/57994

Manure Application Rules and Environmental Considerations
Provedor de dados: 31
Autores: Massey,   Raymond E.; Gedikoglu,   Haluk.
Three manure application limits (N Limit, Annual P Limit and P Banking) were modeled with particular attention to the number of hours needed to appropriately distribute manure.  The benefit and costs estimates indicated that P Banking was more profitable than N Limit which was more profitable than Annual P Limit.  The number of hours required indicated that the Annual P Limit would not be completed within a two month window approximately 2 of 10 years.  The increased number of hours for the Annual P Limit also increased the probability of a runoff event following manure application, relative to the other two scenarios.  This work indicates that regulations that require Annual P Limits of manure cost the farmer and may have the unintended consequence of...
Tipo: Conference Paper or Presentation
Palavras-chave: Manure; Environment; Policy; Runoff; Hours; Acres; Probability; Rainfall; Environmental Economics and Policy; Farm Management; Livestock Production/Industries; Production Economics; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/98765

The succession dynamics of a macroalgal community after a flood disturbance in a tropical stream from São Paulo State, southeastern Brazil
Provedor de dados: 88
Autores: Branco,Ciro Cesar Z.; Branco,Luis Henrique Z.; Moura,Maurício Osvaldo; Bertusso,Fernando Rodrigo.
The succession dynamics of a macroalgal community in a tropical stream (20º58' S and 49º25' W) was investigated after disturbance by a sequence of intensive rains. High precipitation levels caused almost complete loss of the macroalgal community attached to the substratum and provided a strong pressure against its immediate re-establishment. After this disturbance, a weekly sampling program from May 1999 to January 2000 was established to investigate macroalgal recolonization. The community changed greatly throughout the succession process. The number of species varied from one to seven per sampling. Global abundance of macroalgal community did not reveal a consistent temporal pattern of variation. In early succession stages, the morphological form of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disturbance; Macroalgae; Rainfall; Stream; Succession; Tropical.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000200007

Methane fluxes from waterlogged and drained Histosols of highland areas
Provedor de dados: 90
Autores: Rachwal,Marcos Fernando Glück; Zanatta,Josiléia Acordi; Dieckow,Jeferson; Denega,Genuir Luis; Curcio,Gustavo Ribas; Bayer,Cimélio.
Soil can be either source or sink of methane (CH4), depending on the balance between methanogenesis and methanotrophy, which are determined by pedological, climatic and management factors. The objective of this study was to assess the impact of drainage of a highland Haplic Histosol on CH4 fluxes. Field research was carried out in Ponta Grossa (Paraná, Brazil) based on the measurement of CH4 fluxes by the static chamber method in natural and drained Histosol, over one year (17 sampling events). The natural Histosol showed net CH4 eflux, with rates varying from 238 µg m-2 h-1 CH4, in cool/cold periods, to 2,850 µg m-2 h-1 CH4, in warm/hot periods, resulting a cumulative emission of 116 kg ha-1 yr-1 CH4. In the opposite, the drained Histosol showed net...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Greenhouse gas; Water sources; Water-table; Gravimetric moisture; Air temperature; Rainfall.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200013

Meteorological and hydrological variables on occurrence of riverbank erosion along lower São Francisco river
Provedor de dados: 91
Autores: Rocha,Igor P. da; Holanda,Francisco S. R.; Araújo Filho,Renisson N.; Casado,Ana P. B.; Bandeira,Arilmara A.
The objectives of this paper were to analyze the seasonal distributions of climatic and hydrological variables along the Lower São Francisco River, Northeastern Brazil, between the States of Sergipe and Alagoas, and further, to verify their relationships with the erosion of the right margin in Sergipe State. The investigated area comprises the sedimentary portions of the Lower São Francisco River, located at the Cotinguiba-Pindoba Irrigated Perimeter. Historical records of variables such as rainfall, river streamflow velocity, river discharge, wind velocity and the predominant direction were collected from a climatological station as well as rain and streamflow gauges located in the municipality of Propriá. The rainfall that occurs in the region is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: River discharge; Wind; Rainfall; Water resources.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000200004

Single and split nitrogen dose in wheat yield indicators
Provedor de dados: 91
Autores: Costa,Juliane S. P.; Mantai,Rubia D.; Silva,José A. G. da; Scremin,Osmar B.; Arenhardt,Emilio G.; Lima,Andressa R. C. de.
ABSTRACT Single or split nitrogen (N) supply can maximize the expression of wheat yield indicators. The objective of the study was to evaluate the greater N use efficiency on wheat yield indicators by the single and split N supply under favorable and unfavorable year conditions to the crop in succession system of high and reduced residual N release. The study was conducted in 2014 and 2015, in a randomized complete block design with four replicates in a 4 x 3 factorial, for N-fertilizer doses (0, 30, 60, 120 kg ha-1) and supply forms [full dose (100%) in the phenological stage V3 (third expanded leaf); split dose (70 and 30%) in the phenological stages V3/V6 (third and sixth expanded leaves, respectively) and; split dose (70 and 30%) in the phenological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Urea; Residual N; Temperature; Rainfall.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100016

Temporal distribution of Aedes aegypti Linnaeus (Diptera, Culicidae), in a Hospital in Cuiabá, State of Mato Grosso, Brazil
Provedor de dados: 92
Autores: Carvalho-Leandro,Danilo de; Ribeiro,Ana Lúcia Maria; Rodrigues,Jorge Senatore Vargas; Albuquerque,Cleide Maria Riberiro de; Acel,Anagela Maria; Leal-Santos,Fábio Alexandre; Leite Jr,Diniz Pereira; Miyazaki,Rosina Djunko.
This study aimed at registering and monitoring the presence of Aedes aegypti in the University Hospital Júlio Muller, Cuiabá-MT, as well as investigating the influence of temperature and rainfall on its temporal distribution and egg densities in ovitraps. The study was performed from April/2007 to March/2008, utilizing ovitraps with 10% of hay infusion and a wood paddle as an oviposition substrate. For surveillance, one ovitrap was placed in each of the 12 points distributed throughout the hospital. Ovitraps were collected monthly at the end of a 5-day installation period. After egg counting, wood paddles were immersed in water to allow larval eclosion for species identification through optical microscopy. Egg Density Index (EDI), Positive Ovitraps Index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Monitoring; Ovitraps; Rainfall; Temperature.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000400025

Phenology of Campomanesia adamantium (Cambess.) O. Berg in Brazilian Cerrado
Provedor de dados: 94
Autores: Leão-Araújo,Érica Fernandes; Souza,Eli Regina Barboza de; Naves,Ronaldo Veloso; Peixoto,Nei.
Abstract Campomanesia adamantium is a fruit tree native to Cerrado and important for human consumption as food, herbal medicine and even in the beverage industry. The aim of this study was to evaluate the vegetative and reproductive phenology of C. adamantium plants in the region of Ipameri-GO, the synchronization of phenophases and the correlation with climatic data. Rainfall, relative humidity, average, maximum and minimum temperature, as well as sprouting, flowering and fruiting data of C. adamantium plants were collected between September and December of 2016 and 2017. Graphs were plotted for climatological data and phenological phases. Phenophase synchrony analysis and correlation of these phases with the climate of the region were performed....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flowering; Fructification; Gabiroba; Phenophases; Rainfall; Relative humidity; Savannah; Sprouting; Temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000200203

Intra- and inter-annual variations in Chironomidae (Insecta: Diptera) communities in subtropical streams
Provedor de dados: 103
Autores: Nava,Diane; Restello,Rozane M.; Hepp,Luiz U.
The structure and composition of stream benthic communities are strongly influenced by spatial and temporal factors. This study evaluated the intra and inter-annual variations in Chironomidae communities in subtropical streams. The organisms were sampled from 10 small-order streams during the summer and winter of 2010-2012. The number of chironomid specimens sampled was 7,568, distributed in 49 genera. Chironomid abundance and richness varied intra and inter-annually and community composition varied intra-annually (2010 and 2011). Water temperature, total organic carbon, nitrogen, and rainfall were correlated with chironomid community composition. The intra-annual variation of the community was dependent on climatic variations (temperature and rainfall)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agriculture impacts; Bioindicators; Macroinvertebrates; Rainfall.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000300207

Climatic risk zoning for corn and palisade grass (Brachiaria brizantha cv: Marandu) cultivated in integrated crop-livestock systems in São Paulo state, Brazil
Provedor de dados: 96
Autores: Santos,Patrícia Menezes; Pezzopane,José Ricardo Macedo; Mendonça,Fernando Campos; Bettiol,Giovana Maranhão; Evangelista,Balbino Antônio; Silva,Fernando Antônio Macena da.
Climatic risk zoning allows the identification of areas of low risk of reduced crop productivity due to climatic events. In Brazil, losses to agriculture due to climate are mainly caused by drought. The objective of this research was to determine areas of low climatic risk for corn and palisade grass cultivated in integrated crop-livestock systems in Sao Paulo state. Corn varieties characterized by a 120-day growing cycle and soil with three different water holding capacities (sandy, medium and clayey soils) were considered. A daily water balance model was used to simulate planting dates between September and December. The water requirement satisfaction index (WRSI) was calculated for critical phenological phases of both cultures (germination, emergence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Integrated crop-livestock production systems; Rainfall; Water balance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000100006

Climatic risk for potato late blight in the Andes region of Venezuela
Provedor de dados: 63
Autores: Garcia,Beatriz Ibet Lozada; Sentelhas,Paulo Cesar; Tapia,Luciano Roberto; Sparovek,Gerd.
Potato is an important crop for Venezuelan agriculture. However, its production is highly affected by late blight (Phytophtora infestans), since weather is commonly favorable for this disease. The aim of this study was to determine the sowing dates of low climatic risk for potato late blight in the Andes region of Venezuela, with an agrometeorological disease model and geographical information system (GIS) tools. The disease model used in this study was developed by Hyre (1954) which requires daily rainfall and temperature data which were obtained from 106 weather stations, located at the States of Mérida, Táchira, and Trujillo, for a period of 31 years. Hyre's model was applied for all stations obtainig the following variables: number of disease favorable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytophtora infestans; Hyre's model; Temperature; Rainfall.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700007

Variability of water balance components in a coffee crop in Brazil
Provedor de dados: 63
Autores: Silva,Adriana Lúcia da; Roveratti,Renato; Reichardt,Klaus; Bacchi,Osny Oliveira Santos; Timm,Luis Carlos; Bruno,Isabeli Pereira; Oliveira,Julio César Martins; Dourado Neto,Durval.
Establishing field water balances is difficult and costly, the variability of their components being the major problem to obtain reliable results. This component variability is presented herein for a coffee crop grown in the Southern Hemisphere, on a tropical soil with 10% slope. It was observed that: rainfall has to be measured with an appropriate number of replicates; irrigation can introduce great variability into calculations; evapotranspiration, calculated as a remainder of the water balance equation, has exceedingly high coefficients of variation; the soil water storage component is the major contributor in error propagation calculations to estimate evapotranspiration; and that runoff can be satisfactorily controlled on the 10% slope through crop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Component variability; Rainfall; Evapotranspiration; Soil water storage.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200001

Daily rainfall variability at a local scale (1,000 ha), in Piracicaba, SP, Brazil, and its implications on soil water recharge
Provedor de dados: 63
Autores: Reichardt,K.; Angelocci,L.R.; Bacchi,O.O.S.; Pilotto,J.E.
Daily rainfall variability at a local scale (1,000 ha) was studied at Piracicaba, SP, Brazil, for the period of one year (1993-1994), in order to better understand the process of soil water recharge. Coefficients of variation of daily data for ten observation points varied from 2.2 to 169.3% and the variability was independent of rain type, i.e. whether convective, frontal or of other origin. Data were not related to separation distances between observation points and it is concluded that one observation point does not represent areas as far as 1,000 to 2,500 m apart, for daily, monthly or even quarterly averages. Yearly totals for the ten observation points presented a coefficient of variation as low as 3.06%, indicating that all points can replace each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variability; Rainfall; Soil water recharge.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100008

Rainfall distribution and its use in agricultural planning
Provedor de dados: 106
Autores: Amnuay Sittichareonchai.
4 ill., 2 tables
Palavras-chave: Rainfall; Distribution; Evaporation; Evapotranspiration; Agricultural planning; ข้าวโพด; ข้าวฟ่าง; ระบบการปลูกพืช; การวางแผนการปลูกพืช.
Ano: 1980
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4014

Cropping pattern management of corn to avoid losses from enveronmental calamity in central plane of Thailand
Provedor de dados: 106
Autores: Somsak Suriyo; Chutip Chanaseni; Narong Wuttiwan; Amnat Jantrakrut.
4 ill., 1 table
Palavras-chave: Corn; Maize; Rainfall; Cropping systems; Environmental calamity; Central Thailand region; ข้าวโพด; ฝน; ระบบการปลูก; พื้นที่ภาคกลาง; ความเสียหายจากภัยธรรมชาติ; การจัดการ.
Ano: 1989
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4349

ผลของการเปลี่ยนแปลงสภาพภูมิอากาศต่อการระบาดของโรคข้าว จังหวัดเชียงรายและพะเยา
Provedor de dados: 106
Autores: Nootjarin Jungkhun; Piyapa Srikhom; Konsiri Srinil; Taraporn Yuneyong; Kanteera Kanta.
Main objective of this study was to evaluate the relationship between climate changes and rice disease s epidemics in Chiangrai and Phayao provinces. The study was conducted at Chiangrai Rice Research Center during the year 2011-2013 by monthly broadcasting two popular rice varieties in the area; Phitsanulok 2 and Sanpatong 1. The experiment was carried out in Split plot in RCB Design with 3 replicates having month as main plot and variety as sub-plot. Disease incidence and severity were evaluated at 3 growth stages i.e. 20, 50 and 90 days after sowing. Concurrently, Disease incidence and severity were recorded for rice diseases in the farmers’ fields of Chiangrai and Phayao provinces having infected at 10 rai and above. Disease data showed that both rice...
Tipo: PhysicalObject
Palavras-chave: Climate change; Temperature; Relative humidity; Rainfall; Rice disease; Epidemic; Global warming; Rice pathogen; Rice; Rice production; Phitsanulok 2 variety; Sanpatong 1 variety; Plant diseases survey; Pathogens; Chiangrai province; Phayao province; ข้าว; พันธุ์พิษณุโลก 2; พันธุ์สันป่าตอง 1; การผลิตข้าว; การสำรวจโรคพืช; โรคข้าว; เชื้อสาเหตุของโรค; การระบาดของโรค; ภาวะโลกร้อน; การเปลี่ยนแปลงสภาพภูมิอากาศ; อุณหภูมิ; ความชื้นสัมพัทธ์; ปริมาณน้ำฝน; การประเมินความเสียหาย; จ.เชียงราย; จ.พะเยา.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5695

ความหลากหลายของเห็ดในสถานีเกษตรหลวงอ่างขางจังหวัดเชียงใหม่
Provedor de dados: 106
Autores: Baramee Sakolrak.
Thesis (M.Sc. in Agriculture)
Tipo: PhysicalObject
Palavras-chave: Mushrooms; Species; Rainfall; Chiang Mai province; เห็ด; ชนิดพันธุ์; การสำรวจ; ปริมาณน้ำฝน; สถานีเกษตรหลวงอ่างขาง; จ.เชียงใหม่.
Ano: 2006
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5356

The drought of the century in the Amazon Basin: an analysis of the regional variation of rainfall in South America in 1926
Provedor de dados: 36
Autores: Williams,Earle; Dall' Antonia,Alaor; Dall' Antonia,Vitoria; Almeida,Jorge Mathias de; Suarez,Francisco; Liebmann,Brant; Malhado,Ana Claudia Mendes.
The most severe drought in tropical South America during the 20th century occurred in 1926. This extreme El Nino year is further documented anecdotally, in an update of the river stage observations at Manaus, and in annual rainfall records. The annual rainfall anomaly is an east-west dipole over tropical South America, with drought to the west over the Amazon basin whose discharge is documented at Manaus, and with a surplus to the east and including the Nordeste region of Brazil. Speculations about a role for aerosol in aggravating the drought are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rainfall; Climatic history; Drought.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672005000200013

Diurnal variability of rainfall in southwest Amazonia during the LBA-TRMM field campaign of the austral summer of 1999
Provedor de dados: 36
Autores: Marengo,José A.; Fisch,Gilberto; Morales,Carlos; Vendrame,Iria; Dias,Paulo C.
The TRMM-LBA field campaign was held during the austral summer of 1999 in southwestern Amazonia. Among the major objectives, was the identification and description of the diurnal variability of rainfall in the region, associated with the different rain producing weather systems that occurred during the January-February season. By using a network of 40 digital rain gauges implemented in the state of Rondônia, and together with observations and analyses of circulation and convection, it was possible to identify details of the diurnal cycle of rainfall and the associated rainfall mechanisms. Rainfall episodes were characterized by regimes of "low-level easterly" and "westerly" winds in the context of the large-scale circulation. The westerly regime is related...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Convection; Raingauge; Rainfall; Diurnal cycle.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000400011

Soil CO2 efflux in central Amazonia: environmental and methodological effects
Provedor de dados: 36
Autores: Zanchi,Fabrício B.; Waterloo,Maarten J.; Kruijt,Bart; Kesselmeier,Jürgen; Luizão,Flávio J.; Manzi,Antônio O.; Dolman,Albertus J.
Soil respiration plays a significant role in the carbon cycle of Amazonian rainforests. Measurements of soil respiration have only been carried out in few places in the Amazon. This study investigated the effects of the method of ring insertion in the soil as well as of rainfall and spatial distribution on CO2 emission in the central Amazon region. The ring insertion effect increased the soil emission about 13-20% for sandy and loamy soils during the firsts 4-7 hours, respectively. After rainfall events below 2 mm, the soil respiration did not change, but for rainfall greater than 3 mm, after 2 hours there was a decrease in soil temperature and respiration of about 10-34% for the loamy and sand soils, with emissions returning to normal after around 15-18...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil respiration; Rainfall; Soil temperature.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000200001

POPULATION FLUCTUATION OF Empoasca sp. (HEMIPTERA: CICADELLIDAE) IN A PHYSIC NUT CROP IN MATO GROSSO DO SUL
Provedor de dados: 37
Autores: de CARVALHO,Denisar Paggioli; de OLIVEIRA,Harley Nonato.
Physic nut (Jatropha curcas L.) is an oilseed, semi-evergreen shrub or small tree of the Euphorbiaceae family, whose seeds contain oil that can be processed into a high quality biofuel. However, there have been reports of arthropods feeding from its leaves, including the green leafhopper Empoasca sp. (Hemiptera: Cicadellidae). The large numbers of this insect, observed in certain periods of the year in many regions of Brazil, are causing damage to the oilseed crops. This study aims at evaluating the fluctuation in green leafhopper population in a physic nut crop in Dourados, Mato Grosso do Sul, to assess possible correlations with rainfall, maximum, average and minimum temperatures. This evaluation was conducted between March 2011 and July 2012. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Green leafhopper; Rainfall; Seasonality.
Ano: 2016
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2016000100008

Late Holocene paleoenvironments of the floodplain of the Solimões River, Central Amazonia, based on the palynological record of Lake Cabaliana
Provedor de dados: 39
Autores: Sá,Natália de Paula; Absy,Maria Lúcia; Soares,Emílio Alberto Amaral.
ABSTRACT The core PD-67 of 160 cm depth was collected from the delta of Lake Cabaliana situated on the Solimões River. Seventeen samples were removed for palynological and sedimentological analysis and three for radiocarbon analysis. Two dry periods, both in the Late Holocene, were observed (2800-2550 cal yr BP, 1450-550 cal yr BP) separated by a wetter phase (2550-1450 cal yr BP). In 2800-2550 cal yr BP, varzea forests of Alchornea, Symmeria, Cecropia, Alternanthera and Asteraceae were predominant. Beginning in 2,550-1450 cal yr BP, the varzea was characterized by pioneer elements, such as Cassia, Laetia, Mabea, Symmeria and Cecropia, and by the expansion of Poaceae, Cyperaceae, Sagittaria, Montrichardia and Asteraceae. In 1450-550 cal yr BP the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Pollen; Quaternary; Rainfall; Terra firme forest.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300473

Litterfall, precipitation and nutrient fluxes in a secondary lowland rain forest in Ile-Ife, Nigeria
Provedor de dados: 39
Autores: Oziegbe,Modupe B.; Muoghalu,Joseph I.; Oke,Samson O.
Litterfall, precipitation and nutrient fluxes were investigated in a 0.25 ha plot of a secondary lowland rain forest in Ile-Ife, Nigeria, for a period of one year. The study determined the magnitude of nutrient fluxes through (litterfall, incident rainfall, throughfall and stemflow) and evaluated the relative importance of these components as pathways of nutrient transport to the soil of this forest. There was a significant monthly variation in litterfall and the highest values of the standing crop of litter occurred from November to March. The concentration of elements in both throughfall and stemflow were higher than those of incidence rainfall. Greater quantities of calcium, magnesium, iron, zinc, copper and nitrogen were deposited annually from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrient deposition; Rainfall; Litter; Soil; Secondary forest.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000300020

Time distribution of heavy rainfall events in Urussanga, Santa Catarina State, Brazil - doi: 10.4025/actasciagron.v33i4.6664
Provedor de dados: 1
Autores: Back, Álvaro José; Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina.
A knowledge of rainfall time distribution is important for several types of hydrological studies related to surface runoff. This study aims to determine the time distribution pattern of heavy rain events in Urussanga, Santa Catarina State, Brazil. It employed recording rainfall charts from the meteorological station of Urussanga (latitude: 28.31° S, longitude: 49.19° W, altitude: 49 m) from 1980 to 2007. Rain events were classified into four types according to the duration quartile in which the greatest amount of precipitation occurred. It is found that type I rain events are more frequent, followed by type II, and these occur predominantly during the summer, while type III and IV rain events are distributed throughout the year. In the summer, rain events...
Tipo: Análise de dados
Palavras-chave: 3.01.04.02-5 Drainage; Rainfall; Rainfall probabilities Hidrologia Drainage; Rainfall; Rainfall probabilities.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6664

Mathematical modeling and simulation of hourly precipitation through rectangular pulses - doi: 10.4025/actasciagron.v33i4.7052
Provedor de dados: 1
Autores: Uggioni, Edison; Universidade do Extremo Sul Catarinense; Back, Álvaro José; Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina; Vieira, Hamilton Justino; Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina.
The recorded historical series of precipitation are usually available for short periods of time and with many failures. The use of mathematical modeling to simulate rainfall is a tool used to circumvent this problem and to simulate the operation of water systems in different scenarios. The present study applies mathematical modeling to the hourly pluviometric precipitation data simulation.  A pluviographical data set from October 1980 to December 2007 was used in the study.  Precipitation data sets were obtained through daily pluviometric digitalization from the Meteorologic Station of Epagri at Urussanga, in southern Santa Catarina, Brazil (latitude 28º 31’ S and longitude 48º 19’ W).  To simulate the hourly rain series, the stochastic model was modified...
Tipo: Pesquisa aplicada
Palavras-chave: 5.03.02.00-0 Hydrology; Rainfall; Simulation; Probability; Stochastic models engenharia de Água e Solo Hydrology; Rainfall; Simulation; Probability; Stochastic models.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/7052

Assessing the Impact of Changing Climate on Crop Water Requirements in Nigeria.
Provedor de dados: 111
Autores: Ilesanmi, Oluwaseun Ayodele.
Climate change is a phenomenon most of the world is recently coming to terms with but unfortunately, the African region is yet to fully understand and prepare for its effects. The change is predicted to herald positive results likewise potentially severe consequences for global food security. This study aims to improve the understanding of the impact these changes being experienced in the Nigerian climate system will have on Crop Water Requirements (CWR) for optimal productivity. Five statistically downscaled and bias-corrected Global Climate Models (GCMs): CCCMA, NOAA, MIROC, ICHEC, and NCC were applied in the estimation of CWR through the period 1985–2100 under the Representative Concentration Pathway RCP8.5. These were used to produce values of crop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop water requirement; Climate Change; Nigeria; Rainfall; Temperature; Representative Concentration Pathways.
Ano: 2023
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7521

Effects of tillage direction on sediment yield in Chanchaga Basins
Provedor de dados: 111
Autores: Kuti, Ibrahim Abayomi.
There is no study on the effect of tillage erosion in the region. Runoff plots (24) were constructed on a similar slope. Now sedimentation tanks were incorporated into runoff measurement using catch-pits to collect coarse and suspended sediment. Quadratic model fits sediment and rainfall, while the exponential model fits runoff and sediment yield. The effect of tillage without a crop was highest on sediment yield. Slope gradients have an effect on sediment deposition in Shatta basin because of the convex and concave landscape. While concave landscape makes the slope gradient to have a none effect on sediment yield in Koropa basin. Ridge made parallel to the slope has a high effect on sediment yield. The study concluded that tillage parallel to the slope...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tillage erosion; Rainfall; Contour line ridges; Polynomial regression; Cover Crops; ANCOVA; Runoff; Sediment yield.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6757

Validation of Universal Soil loss Equation for Selected Soil Locations in North Central Nigeria Using Rainfall Simulator
Provedor de dados: 111
Autores: Kuti, Ibrahim Abayomi.
Erosion control in Nigeria must be met with high standards in other to attain a sustainable agricultural practice to meet the demand of the growing population in terms of food production. The study is aimed at estimating soil loss using a locally made rainfall simulator and accertaining the performance of the Universal Soil Loss Equation (USLE) model in predicting soil loss in the study location. For this to investigated, experiments were conducted using rainfall simulators, which is readily not available in Nigeria due to its high cost. The drop velocity (DV) of the constructed rainfall simulator was calculated to be 8.101m/s and 2.443 m/s respectively when operated at maximum and minimum intensity. The performance test revealed that the experimental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bare; Rainfall; USLE; Soil; Vegetative.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6719

Do precipitation and food affect the reproduction of brown brocket deer Mazama gouazoubira (G. Fischer 1814) in conditions of semi-captivity?
Provedor de dados: 42
Autores: Juliá,Juan P.; Peris,Salvador J.
The births of brown brocket deer ( Mazama gouazoubira) in a secondary lower montane forest called "yunga" in northwestern Argentina were compared with rainfall. Analyses were performed with rainfall and flower-fruit fall in an attempt to determine the possible importance of these seasonal variables in birthing. The births were not directly correlated with rainfall, but rather with the flower and fruit fall of exotic plant species. This may be related to favor the development of fawns, which eat the new and more digestible plant parts, accessible one month after their births.The non-seasonal births observed around the year could be related to the selection by the deer of some plant species that have been introduced into the region ( Prunus, Morus and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Argentina; Birth phenology; Fruit; Rainfall.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300010

Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions
Provedor de dados: 42
Autores: Lamarca,Edmir V.; Prataviera,Juliana S.; Borges,Igor F.; Delgado,Liliana F.; Teixeira,Carmen C.; Camargo,Marcelo B.P. de; Faria,José M.R.; Barbedo,Claudio J.
This study aims to analyze the maturation and dispersal of Eugenia pyriformis Cambess. seeds produced in different years, and the influence of variation in thermal and hydric environment on seed physical and physiological characteristics at dispersal. Fruits at different developmental stages were harvested in the city of São Paulo between 2003 and 2010, as well as in the cities of Campinas and Lavras, in 2009 and 2010 and analyzed for size and color. The seeds were extracted from the fruits and their dry mass, water content, germination and vigor were assessed. Results showed that seed maturation is unsynchronized to the maturation of the fruit, taking 45 days on average (430 growing degree-days), longer in rainy times or lower temperatures. Seeds with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dispersal; Development; Degree-day; Rainfall; Recalcitrants seeds.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100223

Climatic characteristics of the 2010-2016 drought in the semiarid Northeast Brazil region
Provedor de dados: 42
Autores: MARENGO,JOSÉ A.; ALVES,LINCOLN M.; ALVALA,REGINA C.S; CUNHA,ANA PAULA; BRITO,SHEILA; MORAES,OSVALDO L.L.
ABSTRACT This study discusses the climatological aspects of the most severe drought ever recorded in the semiarid region Northeast Brazil. Droughts are recurrent in the region and while El Nino has driven some of these events others are more dependent on the tropical North Atlantic sea surface temperature fields. The drought affecting this region during the last 5 years shows an intensity and impact not seen in several decades in the regional economy and society. The analysis of this event using drought indicators as well as meteorological fields shows that since the middle 1990s to 2016, 16 out of 25 years experienced rainfall below normal. This suggests that the recent drought may have in fact started in the middle-late 1990s, with the intense droughts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Northeast Brazil; Rainfall; Water deficit; El Nino; Vulnerability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000501973

Plant growth regulator losses in cotton as affected by adjuvants and rain
Provedor de dados: 65
Autores: Echer,Fábio Rafael; Rosolem,Ciro Antonio.
Most of Brazilian cotton is produced in regions where annual rainfall exceeds 1,500mm, hence plant growth regulators (PGR) may be washed from the leaves before being absorbed. The objective of this research was to evaluate mepiquat chloride and chlormequat chloride washing from cotton leaves by rains occurring at different moments post spraying. The experiment was conducted in a greenhouse. Both PGR were sprayed to cotton at pin-head square at 15g ha-1 a.i. with and without a silicon-based adjuvant, and simulated rains were applied at 0, 0.75, 1.5, 3.0, 6.0, 12.0 and 24 hours after spraying, plus a control without rainfall. Addition of silicon adjuvant increased PGR uptake. Rainfall occurring up to 24 hours after spraying resulted in some PGR loss from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum; Plant height; Mepiquat chloride; Chlormequat Chloride; Rainfall.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012001200006