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Search Results: 1 - 10 of 516612 matches for " Piedade S?nia Maria de Stefano "
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Quadrados latinos obtidos por meio de técnicas de confundimento em ensaios fatoriais
Nogueira, Maria Cristina Stolf;Corrente, José Eduardo;Piedade, Snia Maria de Stefano;
Scientia Agricola , 2000, DOI: 10.1590/S0103-90162000000300008
Abstract: latin square designs have been very useful in agriculture and animal sciences. they are, in general, obtained following algebrical rules from basic operations for positive integers and the m-modular number system. in this way, from an experiment installed in a factorial scheme, it is possible to obtain as many latin squares as the levels of treatments, through the use of a confounding technique. these schemes lead to orthogonal replications of latin squares. the aim of this work was to evaluate this technique in order to facilitate plannings. an example of a 3 x 3 x 3 factorial design without replications is presented.
Quadrados latinos obtidos por meio de técnicas de confundimento em ensaios fatoriais
Nogueira Maria Cristina Stolf,Corrente José Eduardo,Piedade Snia Maria de Stefano
Scientia Agricola , 2000,
Abstract: Os esquemas em quadrado latino tem se mostrado muito úteis na experimenta o agron mica e zootécnica. O modo de obten o dos quadrados latinos em geral segue regras algébricas de constru o a partir de opera es básicas sobre o conjunto de números inteiros positivos, mais especificamente, sobre as classes de resto módulo (m). Da mesma forma, considerando um ensaio instalado em esquema fatorial, ao se usar a técnica do confundimento, formam-se tantos quadrados latinos ortogonais quantos forem os níveis de tratamento. Tais esquemas conduzem a repeti es ortogonais de quadrados latinos. Assim, o objetivo deste trabalho é abordar a aplica o desta técnica de modo a facilitar o planejamento. é apresentado um exemplo de um ensaio fatorial 3 x 3 x 3 sem repeti es.
Desenvolvimento vegetativo e custo de produ??o de porta-enxertos de citros em recipientes para fins de subenxertia
Girardi, Eduardo Augusto;Mour?o Filho, Francisco de Assis Alves;Piedade, Snia Maria de Stefano;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000500010
Abstract: the vegetative development and the estimation of the production cost of eleven citrus rootstocks for inarching were evaluated in different containers. 'rangpur' lime cultivar limeira (citrus limonia osbeck); 'swingle' citrumelo (poncirus trifoliata (l.) raf. x citrus paradisi macf.); 'cleópatra' mandarin (citrus reshni hort. ex tanaka); 'sunki' mandarin (citrus sunki hort. ex tanaka); 'volkamer' lemon cultivar catania 2 (citrus volkameriana pasquale); 'caipira' sweet orange cultivar dac (citrus sinensis l. osbeck); 'rugoso da áfrica' rough lemon cultivar mazoe (citrus jambhiri lush.); poncirus trifoliata cultivar davis a; 'sun shu sha kat' mandarin (citrus sunki hort. ex tanaka); 'sunki' mandarin cultivar 2506 or fruto grande (citrus sunki hort. ex tanaka) and poncirus trifoliata cultivar barnes were studied. containers used were: 290 ml leaching tubes, 1.7 l polyethylene bags, and rootstocks transplanted from 75 ml leaching tubes to 1.7 and 4.5 l polyethylene bags. rootstocks directly sowed in 1.7 l polyethylene bags reach optimal size for inarching in the shortest period, 100 to 150 days after sowing. they also lead to larger plants with satisfactory root system, however with a higher cost of production when compared to production system in 290 ml leaching tubes.
Fusarium oxysporum strains as biocontrol agents against Fusarium wilt: effects on soil microbial biomass and activity
Ghini, Raquel;Mezzalama, Monica;Ambrosoli, Roberto;Barberis, Elisabetta;Garibaldi, Angelo;Piedade, Snia Maria de Stefano;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000100012
Abstract: before planning the large-scale use of nonpathogenic strains of fusarium oxysporum as biocontrol agents of fusarium wilt, their behaviour and potential impact on soil ecosystems should be carefully studied as part of risk assessment. the aim of this work was to evaluate the effects of antagonistic f. oxysporum strains, genetically manipulated (t26/6) or not (233/1), on soil microbial biomass and activity. the effects were evaluated, in north-western italy, in two soils from different sites at albenga, one natural and the other previously solarized, and in a third soil obtained from a 10-year-old poplar stand (popolus sp.), near carignano. there were no detectable effects on atp, fluorescein diacetate hydrolysis, and biomass p that could be attributed to the introduction of the antagonists. a transient increase of carbon dioxide evolution and biomass c was observed in response to the added inoculum. although the results showed only some transient alterations, further studies are required to evaluate effects on specific microorganism populations.
Avalia??o do bem-estar de aves poedeiras comerciais: efeitos do sistema de cria??o e do ambiente bioclimático sobre o desempenho das aves e a qualidade de ovos
Alves, Sulivan Pereira;Silva, Iran José Oliveira da;Piedade, Snia Maria de Stefano;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000600023
Abstract: this work aimed to evaluate the effect of two different rearing systems (cages and litter) on productive performance and egg quality of laying hens. the trial was conducted for five experimental periods of 28 days each. sixty four pullets of the laying strain isabrown and 64 pullets of the laying strain hy-line w-36, with ages of 19 and 21 weeks, respectively, were used. the combination of two rearing systems (conventional cages and floor system with litter) and two layer strains was evaluated using a completely randomized design, with a 2 × 2 factorial arrangement, and four replicates. the thermal evaluation was performed by analysis of dry air and black globe temperature and relative humidity. for the productive performance analysis, egg production and feed conversion ratio were evaluated. for the egg quality analysis, egg weight, haugh unit, specific gravity, integrity, clearness and shell thickness were evaluated. no differences on the productive performance between rearing systems were observed. the floor system, when properly projected, can be comparable to the cage system with respect to the productive performance and the egg quality. moreover, this rearing system could provided better results for egg quality with lesser egg losses although in less favorable thermal comfort conditions. however, mainly for the semi heavy strain, it could result in larger dirty egg percentage.
Influência do sistema de alojamento no comportamento e bem-estar de matrizes suínas em gesta??o
Silva, Iran José Oliveira da;Pandorfi, Héliton;Piedade, Snia Maria de Stefano;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000700025
Abstract: this research was carried out in the gestation facility, with 24 gilts, 12 females housed in individual cages and 12 housed in collective pens, to evaluate different housing systems (individual cages, collective pens) for pregnant sows, aiming to describe quantitative and qualitative aspects of environment and the characteristics that influence the production system. this work was divided in two stages in function of the way chose for data analysis: bioclimatic and housing system analysis. bioclimatic evaluation was realized by registering meteorological elements, inside gestation room and in external environment. housing system evaluation was realized by behavioral relationships, physiological parameters and productive indexes. a completely randomized blocks design was used, with two housing system and 67 blocks. the environmental characteristics pointed the collective pens housing system as the one that permitted better natural thermal conditioning for pregnant gilts. physiological characteristics and productive indexes showed more adequate values for collective pens housing system, as well as its consequence in the farrowing performance of the pigs. behavior evaluation, performed by image monitoring using video cameras, showed lower incidence of behaviors resulting of environmental stress, stereotypes and aggressive interactions in collective pens housing system.
Biomass, virus concentration, and symptomatology of cucurbits infected by mild and severe strains of Papaya ringspot virus
Pacheco, Davi Andrade;Rezende, Jorge Alberto Marques;Piedade, Snia Maria de Stefano;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000400013
Abstract: pre-immunization with mild strains of papaya ringspot virus - type w (prwv-w) has allowed the mosaic disease to be controlled in different cucurbit species, with increases in marketable fruit yield. the objective of this study was to compare virus concentration, biomass and symptomatology of 'caserta' zucchini squash, 'menina brasileira' long-neck squash and 'crimson sweet' watermelon plants infected by three mild strains and one severe strain of prsv-w. plants were inoculated at the cotyledonary stage, under greenhouse conditions, sampled at 7, 14, 21, 28 and 35 days after inoculation (dai), and analyzed by pta-elisa. the severity of the symptoms was scored according to a scale from 1 to 5, and the fresh and dry biomass of the aerial part of the plants were evaluated at 40 dai. concentrations of the mild strains, based on absorbance values of the pta-elisa, were lower than the concentration of the severe strain for all species. the mild strains did not cause mosaic in infected plants of all species. plants of zucchini squash and watermelon infected by the severe strain exhibited severe mosaic symptoms, but the same was not noticed for infected long-neck squash plants. biomass values from zucchini squash and watermelon plants infected by the mild strains were 1.7 % to 12.4 % lower as compared to healthy plants. biomass values of zucchini squash and watermelon plants infected by the severe strain presented greater reduction, varying from 29 % to 74 %. however, biomass values of long-neck squash plants infected by the mild and severe strains were similar for all treatments.
Danos causados pelo Zucchini lethal chlorosis virus (ZLCV) sobre a produ??o de frutos comerciais de abobrinha de moita 'Caserta'
Giampan, José Segundo;Rezende, Jorge Alberto Marques;Piedade, Snia Maria De Stefano;
Summa Phytopathologica , 2009, DOI: 10.1590/S0100-54052009000300011
Abstract: zucchini lethal chlorosis virus (zlcv) is a tospovirus frequently associated with severe yield loss on cucurbit crops. the purpose of this work was to evaluate the damage caused by this virus on zucchini squash (cucurbita pepo cv. caserta) under field condition. the experiment was carried out at the campus of the college of agriculture, university of s?o paulo, piracicaba, sp, brazil, were zlcv is prevalent. after germination, zucchini squash plants were periodically monitored for the presence of characteristic symptoms induced by zlcv and pta-elisa for virus indexing. infection by papaya ringspot virus - type w and zucchini yellow mosaic virus were also monitored by pta-elisa, and plants infected by these viruses were disregarded for yield evaluation. plants were grouped based on the time the symptoms were first seen. fruits harvested from each plant within each group were classified as marketable (m) and non-marketable (nm) based on the phenotype. plants that did not show symptoms by the end of the crop were considered healthy and their yield was used as control. zucchini squash plants that showed symptoms of zlcv infection up to 23 after emergency did not yield any fruit. marketable fruits were first harvested only from plants that showed symptoms 42 days after emergency. however, the yield of marketable fruits was reduced by 78.5 %, as compared to that from asymptomatic plants. plants that showed symptoms 55 days after emergency showed a reduction on the yield of marketable fruit of 9.6%.
Ability of Aphis gossypii and Myzus persicae to Transmit Cucumber mosaic virus in Single and Mixed Infection with Two Potyviruses to Zucchini Squash
Pinto, Zayame Vegette;Rezende, Jorge Alberto Marques;Yuki, Valdir Atsushi;Piedade, Snia Maria de Stefano;
Summa Phytopathologica , 2008, DOI: 10.1590/S0100-54052008000200016
Abstract: the main objective of this work was to investigate the ability of aphis gossypii and myzus persicae to transmit cucumber mosaic virus (cmv) singly and mixed with two potyviruses (papaya ringspot virus - type w, prsv-w and zucchini yellow mosaic virus, zymv), to zucchini squash plants (cucurbita pepo). the results showed that the potyviruses in general were more efficiently transmitted by both species of aphids as compared to cmv. the transmission of prsv-w, zymv and cmv separately was more efficient than in mixture.
Biomass, virus concentration, and symptomatology of cucurbits infected by mild and severe strains of Papaya ringspot virus
Pacheco Davi Andrade,Rezende Jorge Alberto Marques,Piedade Snia Maria de Stefano
Scientia Agricola , 2003,
Abstract: Pre-immunization with mild strains of Papaya ringspot virus - type W (PRWV-W) has allowed the mosaic disease to be controlled in different cucurbit species, with increases in marketable fruit yield. The objective of this study was to compare virus concentration, biomass and symptomatology of 'Caserta' zucchini squash, 'Menina Brasileira' long-neck squash and 'Crimson Sweet' watermelon plants infected by three mild strains and one severe strain of PRSV-W. Plants were inoculated at the cotyledonary stage, under greenhouse conditions, sampled at 7, 14, 21, 28 and 35 days after inoculation (DAI), and analyzed by PTA-ELISA. The severity of the symptoms was scored according to a scale from 1 to 5, and the fresh and dry biomass of the aerial part of the plants were evaluated at 40 DAI. Concentrations of the mild strains, based on absorbance values of the PTA-ELISA, were lower than the concentration of the severe strain for all species. The mild strains did not cause mosaic in infected plants of all species. Plants of zucchini squash and watermelon infected by the severe strain exhibited severe mosaic symptoms, but the same was not noticed for infected long-neck squash plants. Biomass values from zucchini squash and watermelon plants infected by the mild strains were 1.7 % to 12.4 % lower as compared to healthy plants. Biomass values of zucchini squash and watermelon plants infected by the severe strain presented greater reduction, varying from 29 % to 74 %. However, biomass values of long-neck squash plants infected by the mild and severe strains were similar for all treatments.
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