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Registros recuperados: 6
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Beef heifers grazing behavior and herbage intake in natural grassland under rotational grazing Ciência Rural
Barbieri,Cezar Wankura; Quadros,Fernando Luiz Ferreira de; Jochims,Felipe; Kuinchtner,Bruno Castro; Carvalho,Thiago Henrique Nicola de; Casanova,Pedro Trindade; Fernandes,Augusto Miranda; Pereira,João Bento.
It was evaluated the effect of two rest intervals between grazing occupations in rotational grazing; 375 and 750 DD (degree-days); based on the cumulative thermal sum necessary for leaf expansion of native grasses of two functional groups over the grazing behavior variables from beef heifers with 12 months old. The experiment was conducted as a completely randomized block design, with two treatments, three replications and measures repeated over time. Grazing behavior was assessed in three occasions (Nov 2011, Jan and Mar 2012), with 24h each. The herbage intake was estimated using an external marker (Cr2O3). The leaf mass was similar among the rest intervals, with a mean of 1261kg DM ha-1. The average grazing time was 627.4min day-1 and bite rate was 37.1...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bite rate; Degree-day; Grazing time; Sward structure; Thermal-sum.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001102056
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Development and survival of the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) as a function of temperature: effect on the number of generations in tropical and subtropical regions Neotropical Entomology
Marchioro,CA; Foerster,LA.
The diamondback moth, Plutella xylostella (L.), is the most important pest of brassicaceous crops worldwide. Since temperature is the major abiotic factor influencing insect development and thermal requirements may vary among insect populations, it is important to know the effect of temperature on development and survival of a subtropical strain of P. xylostella. Development and survival of the diamondback moth was evaluated under seven constant temperatures ranging from 10°C to 35°C. Development was completed between 10°C and 32.5°C, but at 35°C all individuals died in the larval stage. Data were fitted to one linear and five nonlinear models. Considering as criteria the goodness of fit and the ability to estimate parameters of biological significance,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Degree-day; Development rate; Lower development threshold; Thermal requirement; Upper development threshold.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000500003
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Maturation of Eugenia pyriformis seeds under different hydric and thermal conditions Anais da ABC (AABC)
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
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Rate of development of forensically-important Dipterain southern Brazil Rev. Bras. entomol.
Krüger,Rodrigo F.; Kirst,Frederico D.; Souza,Alex S. B. de.
Dipteran larvae were collected from rabbit (Oryctolagus cunniculus L.) carcasses during the four seasons in 2005 in the southernmost state of Rio Grande do Sul, Brazil. The larvae were fed ground beef at ambient temperatures following collection from carcasses. The development of each species under these conditions was estimated. The most abundant species in the carcasses were Lucilia eximia (Wiedemann) and Chrysomya albiceps (Wiedemann) (Calliphoridae), and they were found in all seasons. The data were fitted to a linear model that describes the relationship between temperature and linear developmental rating. These two species are primary forensic indicators in southern Brazil. Other species such as Hemilucilia semidiaphana (Rondani) (Calliphoridae),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calliphoridae; Degree-day; Developmental period; Muscidae.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262010000400014
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Thermal time in sprinkler-irrigated lowland rice PAB
Bartz,Alex Cristiano; Muttoni,Martina; Alberto,Cleber Maus; Streck,Nereu Augusto; Machado,Geter Alves; Giacomeli,Robson; Helgueira,Diogo Balbé; Moura,Diogo da Silva.
Abstract: The objective of this work was to evaluate methods of thermal time calculation and the duration of the development stages of lowland rice (Oryza sativa) irrigated by sprinkling. The experiment was conducted during three growing seasons (2010/2011, 2011/2012, and 2014/2015), with five irrigation water depths, six cultivars, and four replicates. Six methods of thermal time calculation were tested: two using the minimum basal temperature; two using the minimum and optimum temperatures; and two using the minimum, optimum, and maximum basal temperatures. For the thermal time calculation, the crop development cycle was divided into the vegetative, reproductive, and grain-filling phases. The methods that used the three cardinal temperatures showed the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Degree-day; Irrigation water depth; Phenology; Water availability..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000700475
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Using agro-climatic models to estimate the Guineagrass potential production in Brazilian tropical Savanna. Repositório Alice
ARAUJO, L. C.; SANTOS, P. M.; RODRIGUES, D.; PEZZOPANE, J. R. M.; CRUZ, P. G.; OLIVEIRA, P. P. A..
Currently, Brazil has the world?s largest commercial herd of cattle, much of which is raised in extensive grazing farms. The area occupied by pastures in Brazil is approximately 172 million hectares, i.e. 69% of the total area dedicated to agricultural production. Panicum maximum grasses are particularly important in intensive production systems, i.e. irrigated and fertilized, because of their high annual productivity in Brazil?s tropical climate. Managing these intensive systems will require designing robust farming systems and better allocations of limited and increasingly more expensive inputs, in highly variable climates and markets. The development of simulation models that consider the influence of the climate on forage production can facilitate the...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Degree-day; Tropical grass; Panicum.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/904475
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