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| Registros recuperados: 214 | |
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| SCHMITZ,M.F.; CECHIN,J.; HENCKES,J.R.; PIASECKI,C.; AGOSTINETTO,D.; VARGAS,L.. |
| ABSTRACT: The intergenotypic competition of tetraploid ryegrass with natural diploid population may be a tool to reduce the frequency of resistant individuals in an area. This study aimed to identify and compare the phenological development, fitness cost, and competitive ability between diploid and tetraploid ryegrass genotypes. Genotypes were grown in pots, and the morphological variables of genotype growth were assessed every 15 days up to 120 days after emergence to evaluate the fitness cost. Phenological development and seed yield components were measured in a single time together with the fitness cost. Competitive ability was determined in a replacement-series experiment with proportions of tetraploid and diploid ryegrass, in which the number of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lolium multiflorum; Competition; Diploid; Tetraploid; Integrated weed management. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100189 |
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| Costa,Jaílson Penha; Mesquita,Mário Luiz Ribeiro. |
| ABSTRACT Knowledge of weed floristic composition and phytosociology are key factors for improving weed management in pastures. Information on weed species that occur in pastures in Northeast Brazil, particularly in Maranhão State is very limited. It is, therefore, important, to search for information to help farmers to control weeds in livestock farming. This paper describes the weed flora diversity and community structure parameters, including density, frequency, abundance and importance value for each weed species found in five pastures of same age and management in Maranhão State, Northeast Brazil. The weed survey was carried out using a wooden frame (80 cm x 30 cm) placed randomly on the soil surface 30 times in each pasture (n = 150). Weeds were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eragrostis ciliaris; Competition; Biological invasion; Allelopathy; Cyperus rotundus. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000200414 |
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| Mesquita,Mário Luiz Ribeiro; Andrade,Leonaldo Alves de; Pereira,Walter Esfrain. |
| The objective of this study was to compare the ex situ and in situ floristic diversity of the soil weed seed bank of a rice field in northeastern Brazil. In a rice field in the county of Bacabal, located in the state of Maranhão, thirty 25-m² plots were laid out. From 15 plots, soil samples (6/plot; n = 90) were taken with a soil probe (25 × 16 × 3 cm) and placed in aluminum trays in the greenhouse. From the remaining 15 plots, weed samples (6/plot; n = 90) were taken with the same soil probe. The number of seeds was estimated by germination. We evaluated the numbers of species and individuals, as well as the density, frequency, abundance and importance value (IV) for each species. Diversity was computed by the Shannon index (H'). We recorded 13,892... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyperaceae; Competition; Biological invasion; Phytosociology; Smallholder farmers. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300001 |
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| MacDonald, James M.; Handy, Charles R.; Plato, Gerald E.. |
| USDA's Farm Service Agency (FSA) purchases food products for distribution through several of the Department's food assistance programs. This report describes FSA purchase methods and compares them to procurement strategies used by other Federal agencies and by private sector firms. It summarizes the principal policy issues faced by FSA in designing procurement strategies. And it uses a detailed statistical analysis to compare FSA prices to those realized in the private sector, and to identify the separate effects of agricultural commodity prices, seasonality, client location, purchase volumes, product characteristics, and competition on FSA product prices. |
| Tipo: Report |
Palavras-chave: Procurement; Auctions; Food assistance; Competition; Food Consumption/Nutrition/Food Safety. |
| Ano: 1998 |
URL: http://purl.umn.edu/33925 |
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| Shurchkov, Olga. |
| Gender gaps in income and level of position in the workplace are widespread. One explanation for this inequality is that the genders perform differently under competitive conditions, as previous experimental studies have found a significant gender gap in competitive tasks that are perceived to favor men. In this paper, we use a verbal task that is perceived to favor women and find no gender difference under competition per se. We also reject the hypothesis that a .stereotype threat. explains the inability of women to improve performance under competition. We propose an alternative explanation for gender inequality: namely, that women and men respond differently to time pressure. With reduced time pressure, competition in verbal tasks greatly increases the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Gender Differences; Competition; Effects of Time Pressure; Labor and Human Capital; C9; J16; J71. |
| Ano: 2009 |
URL: http://purl.umn.edu/55294 |
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| Andrade,Carlos Mauricio Soares de; Garcia,Rasmo; Valentim,Judson Ferreira; Pereira,Odilon Gomes. |
| This study was carried out from October 2002 to December 2003 to evaluate the dynamics of sward condition and botanical composition of a mixed massaigrass (Panicum maximum x P. infestum, cv. Massai) and forage peanut (Arachis pintoi Ac 01) pasture, intermittently stocked at three daily herbage allowance levels (9.0, 14.5 and 18.4% live weight). Sward condition was characterized in each grazing cycle in terms of the pre and post-grazing sward height, forage mass and percentage of bare ground. Botanical composition (grass, legume and weeds) was evaluated before each grazing period. Sward height and forage mass increased linearly with increasing herbage allowance (HA) levels, and higher values were observed during the rainy season. Percentage of bare ground... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arachis pintoi; Competition; Legume; Panicum maximum; Persistence; Western Amazon. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982006000200002 |
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| MAQBOOL,M.M.; TANVEER,A.; ALI,A.; ABBAS,M.N.; IMRAN,M.; AHMAD,M.; ABID,A.A.. |
| A field experiment was conducted for two consecutive years to study the effect of fertilizer application methods and inter and intra-row weed-crop competition durations on density and biomass of different weeds and growth, grain yield and yield components of maize. The experimental treatments comprised of two fertilizer application methods (side placement and below seed placement) and inter and intra-row weed-crop competition durations each for 15, 30, 45, and 60 days after emergence, as well as through the crop growing period. Fertilizer application method didn't affect weed density, biomass, and grain yield of maize. Below seed fertilizer placement generally resulted in less mean weed dry weight and more crop leaf area index, growth rate, grain weight... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Competition; Fertilizer; Grain yield; Maize; Plant growth. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000100047 |
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| CARON,BRAULIO O.; ELLI,ELVIS F.; BEHLING,ALEXANDRE; ELOY,ELDER; SCHMIDT,DENISE; STOLZLE,JOHN. |
| Abstract The appropriate choice of tree species and planting arrangement for use in agroforestry systems is very important in order to maximize productivity and sustainability. The aim of this study was to evaluate the growth of five tree species and its effect on sugarcane yields in different planting arrays in agroforestry systems. The study was conducted from 2007 to 2011 in the city of Frederico Westphalen, RS, Brazil. The five studied tree species were: guapuruvu (Schizolobium parahybae), bracatinga (Mimosa scabrella), canafístula (Peltophorum dubium), angico-vermelho (Parapiptadenia rigida) and eucalypt (Eucalyptus urophylla S.T. Blake x Eucalyptus grandis Hill ex Maiden). Root collar diameter, diameter at breast height, plant height and mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Array of plants; Competition; Crown diameter; Height. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502425 |
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| Cestari,César. |
| Studies on the sociality of heterospecific assemblages of birds have promoted a greater understanding of the types of interactions and survivorship between coexisting species. This study verified the group compositions in bird assemblages and analyzed the sociality of migratory and resident species on sandy beaches of southeastern Brazil. A transect was established on the median portion of beaches and all the groups of bird species (monospecific, heterospecific) and solitary individuals were registered four days per month from November 2006 to April 2007. The sociality of each species was calculated by its frequency in heterospecific groups, its proportional number of contacts with other species in heterospecific groups, and the number of species that it... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Association; Competition; Heterospecific groups; Nearctic migrants; Shorebirds. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400002 |
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| El Kheir, Sara M.; Cherrat, Lamia; Awussi, Ahoefa A.; Ramia, Nancy E.; Taha, Samir; Rahman, Abdur; Passerini, Delphine; Leroi, Francoise; Petit, Jeremy; Mangavel, Cecile; Revol-junelles, Anne-marie; Borges, Frederic. |
| This article describes a method for high-throughput competition assays using a bioluminescent strain of L. monocytogenes. This method is based on the use of the luminescent indicator strain L. monocytogenes EGDelux. The luminescence of this strain is correlated to growth, which make it suitable to monitor the growth of L. monocytogenes in mixed cultures. To this aim, luminescence kinetics were converted into a single numerical value, called the Luminescence Disturbance Indicator (LDI), which takes into account growth inhibition phenomena resulting in latency increase, decrease in the luminescence rate, or reduction of the maximum luminescence. The LDI allows to automatically and simultaneously handle multiple competition assays which are required for... |
| Tipo: Text |
Palavras-chave: Biopreservation; Listeria monocytogenes; High-throughput screening assays; Bioluminescence; Competition; Mixed culture; Bioprotection; Antibacterial activities. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56534/58236.pdf |
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| Rong Utne, Kjell; Huse, Geir; Ottersen, Geir; Holst, Jens C.; Zabavnikov, Vladimir; Jacobsen, Jan A.; Óskarsson, Guđmundur J.; Nøttestad, Leif. |
| The Norwegian Sea harbours several large pelagic fish stocks, which use the area for feeding during the summer. The period 1995–2006 had some of the highest biomass of pelagic fish feeding in the Norwegian Sea on record. Here we address the horizontal distribution and overlap between herring, blue whiting and mackerel in this period during the summers using a combination of acoustic, trawl and LIDAR data. A newly developed temperature atlas for the Norwegian Sea is used to present the horizontal fish distributions in relation to temperature. The centre of gravity of the herring distribution changed markedly several times during the investigated period. Blue whiting feeding habitat expanded in a northwestern direction until 2003, corresponding with an... |
| Tipo: Text |
Palavras-chave: Herring; Mackerel; Blue whiting; Temperature; Competition; Interaction. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00079/19018/16602.pdf |
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| Carter, Colin A.; MacLaren, Donald; Yilmaz, Alper. |
| Japan is one of the largest importers of wheat in the world, with imports originating from three countries, Australia, Canada, and the United States. Australia, Canada, and Japan all use a government single-desk agency to control wheat trade. Many previous studies on competition in the world grain trade have argued the market is imperfectly competitive, and they often point to the Japanese market. We study the Japanese wheat import market for this reason, but find no compelling evidence of imperfect competition. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Wheat trade; Competition; Crop Production/Industries; International Relations/Trade; F14; L10; Q17. |
| Ano: 1999 |
URL: http://purl.umn.edu/11973 |
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| McIntosh, Craig; de Janvry, Alain; Sadoulet, Elisabeth. |
| This paper uses data from Uganda's largest incumbent microfinance institution to analyze the impact of entry by competing lenders on client behavior. We first examine the geographic placement decisions of competitors, and find that placement decisions are strongly affected by district-level characteristics. We observe that increased competition induces a decline in repayment performance and in savings deposited with the incumbent Village Bank, suggesting multiple loan-taking by clients. Urban clients take multiple loans primarily from lenders with more individual methodologies, while rural clients borrow from several group lenders. Individuals who operate larger businesses are the ones most likely to leave the incumbent Village Bank when a Solidarity Group... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Microfinance; Competition; Credit markets; Financial Economics; O16; D14; L1. |
| Ano: 2003 |
URL: http://purl.umn.edu/25073 |
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| Souza,Sthefanie do Nascimento Gomes de; Piedade,Maria Teresa Fernandez; Demarchi,Layon Oreste; Lopes,Aline. |
| ABSTRACT Amazon wetlands are among the most vulnerable ecosystem to be impacted by climate change, which may increase the frequency of extreme droughts and floods. We used Eichhornia crassipes and Pistia stratiotes, two abundant aquatic plants in the Amazon floodplains, to evaluate the effects of combined temperature and [CO2] increase on growth, physiology and ecological interactions. Individual and paired plants were deposited for three weeks in a microcosm under four IPCC scenarios: control (current temperature/CO2), mild (control + 1.5 ºC, 200 ppm CO2), intermediate (control + 2.5 ºC, 450 ppm CO2) and extreme (control + 3.5 ºC, 850 ppm CO2). P. stratiotes died after three weeks in the intermediate and extreme treatments; E. crassipes experienced no... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass; Competition; Eichhornia crassipes; Pistia stratiotes; Wetlands. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062021005002204 |
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| Tanveer,A.; Khaliq,A.; Javaid,M.M.; Chaudhry,M.N.; Awan,I.. |
| The genus Euphorbia comprises about 2000 species ranging from annuals to trees, including C3, C4, and CAM species. Euphorbia species widely studied in agriculture includes E. antiquorum, E. carollata, E. dentata, E. dracunculoides, E. esula, E. geniculata, E. granulata, E. helioscopia, E. heterophylla, E. hierosolymitana, E. hirta, E. maculata, E. microphylla, E. nerifolia, E. piluifera, E. pulcherrima, E. royleana, E. supine, and E. thiamifolia. These species have been reported mainly in field crops/vegetables, orchards, pastures, and rangelands. Euphorbia plants may present allelopathic effect over desirable cereals, pulses, oilseeds, vegetables, forage plants, and nitrifying bacteria, posing a serious threat to livestock production on open range lands... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Competition; Allelopathy; Crops; Pastures; Livestock; Plant protection. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300024 |
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| Registros recuperados: 214 | |
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