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Search Results: 1 - 10 of 449936 matches for " Joelma de Lira;Dubeux Júnior "
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Decomposi??o de serrapilheira em bosque de sabiá na Zona da Mata de Pernambuco
Freire, Joelma de Lira;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Ferreira, Rinaldo Luiz Caraciolo;Santos, Mércia Virginia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800006
Abstract: the research aimed to evaluate the decomposition of sabiá (mimosa caesalpiniifolia benth) litter fractions by using the nylon bag technique. the following litter fractions were incubated: senescent leaves, leaves at the beginning of mineralization, and branches with diameter up to 20 mm. incubation was performed during periods of 0, 4, 8, 16, 64, 100, and 256 days in 2006 and 2007. the fractions were distributed in a random block design with five replications. it was evaluated the disappearance of biomass, nitrogen (n), and phosphorus (p), concentrations of nitrogen and phosphorus and the carbon/ nitrogen ratio of litter during the periods of incubation. in general, the negative exponential model explained the disappearance of biomass, nitrogen, and phosphorus, however, there was a variation among years and, in some cases, despite of being significant, the models showed a low correlation between predicted and observed data. biomass disappearance rate was slow because only 30% of leaf biomass was mineralized after 256 days of incubation. net nitrogen mineralization showed large variation among years, and it differed among the studied fractions. nitrogen content of the litter increased, on average, until 32 days (leaves) and until 64 days (branches) of incubation followed by stabilization. the linear plateau model was used to explain that process. in the course of the incubation periods, the carbon/nitrogen ration decreased. despite of the high content of nitrogen, the decomposition of sabiá litter is slow, what might reduce the loss of nutrients in the forest, increasing its sustainability and reducing the possible deleterious effects to the environment.
Deposi??o e composi??o química de serrapilheira em um bosque de sabiá
Freire, Joelma de Lira;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Ferreira, Rinaldo Luiz Caraciolo;Santos, Mércia Virginia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800005
Abstract: this research aimed to evaluate the deposition and chemical composition of the components of the existing and deposited litter in a sabiá (mimosa caesalpiniifolia benth) canopy. the experiment was carried out from august 2006 to july 2007. the evaluation of the existing and deposited litter was performed every 28 days using 20 squares with 1m2 randomly allocated and new areas were chosen for each evaluation. the canopy showed plants with an average diameter of 26.8 cm at breast height. monthly deposition of organic matter of leaves and branches during the experimental period was 15,167 kg and 3,373 kg/ha, respectively, and it increased during the highest precipitation period, in a 0.30 relationship with the accumulation, indicating higher accumulation than deposition. leaf proportion was 87% of the total litter, with means of 2.9% of nitrogen and 0.17% of phosphorus. the carbon/nitrogen ratio of leaves was below 30, while carbon/nitrogen ratio of the branches ranged from 30 to 40, proving a better quality for leaves. during the experimental period, deposition of nitrogen through litter was approximately 462 kg/ha and 30 kg/ha for phosphorus. litter deposition is essential for maintenance of soil fertility in a sabiá canopy and it contributes for conservation and sustainability of the canopy.
Caracteriza??o e Sele??o de Clones de Capim-Elefante (Pennisetum purpureum Schum.) na Zona da Mata de Pernambuco
Mello, Alexandre Carneiro Le?o de;Lira, Mário de Andrade;Dubeux Júnior, José Carlos Batista;Santos, Mércia Virgínia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2002, DOI: 10.1590/S1516-35982002000100004
Abstract: this work aimed to characterize an elephantgrass collection (pennisetum purpureum schum.) comprising 71 clones and selecting the best ones to be tested later under grazing conditions. it was carried out at cedro experimental station - ipa, located in vitória de santo ant?o, forest zone of pernambuco state. the period of evaluation included both the raining and the dry season. each clone was represented by a non-replicated plot of 10 m2. according to linear correlation analysis, the more productive clones also showed highest plant height and highest growing point height, greatest stem diameter, highest stem/leaf ratio, highest basal and total tiller numbers and greatest leaf lenght. the same characteristics above were also positively correlated with the leaf blade yield, except stem/leaf ratio. there was a high correlation coefficient (r = 0.9517) between dry matter yield and leaf blade yield. the selection of clones to be tested under grazing conditions was based on the materials that showed the highest leaf blade yield. these materials were: mineir?o/ipeaco, hexaplóide, mole de volta grande, king grass, 591-76 or cameroon, ce 5 ad, gigante de pinda, ce 4 ad, elefante da col?mbia and vrukwona
Utiliza o de Três Fontes de Nitrogênio Associadas à Palma Forrageira (Opuntia ficus-indica, Mill.) Cv. Gigante na Suplementa o de Vacas Leiteiras Mantidas em Pasto Diferido
Albuquerque Samuel Salgado Cavalcanti de,Lira Mário de Andrade,Santos Mércia Virgínia Ferreira dos,Dubeux Júnior José Carlos Batista
Revista Brasileira de Zootecnia , 2002,
Abstract: O fornecimento da palma forrageira como único alimento n o atende as necessidades nutricionais do rebanho, notadamente em proteína e fibra. Nesta pesquisa avaliaram-se fontes de suplementa o protéica sobre o desempenho de vacas leiteiras alimentadas com palma e pasto diferido, durante a esta o seca, bem como a composi o botanica da pastagem. Testaram-se três tratamentos: T1 = pasto diferido (PD) + palma + cama de aviário; T2 = PD + palma + farelo de soja e T3 = PD + palma + uréia/sulfato de am nio, em um delineamento de blocos casualizados. Utilizaram-se 12 vacas mesti as 5/8 Holando-Zebu, com produ o média de leite de 5,6 kg/dia/vaca e peso vivo (PV) médio de 452 kg. O experimento teve dura o de 121 dias, sendo 21 dias de período de adapta o. Os resultados para produ o de leite in natura (3,38, 5,33 e 3,38 kg/vaca/dia), produ o de leite corrigido para 4% de gordura (3,15, 4,98 e 3,11 kg/vaca/dia), varia o de peso vivo (-351, 77 e -401 g/vaca/dia) e consumo in natura de palma (26,3, 37,8 e 26,3 kg/vaca/dia), para T1, T2 e T3, respectivamente, demonstraram a superioridade do farelo de soja como fonte protéica, em rela o aos demais tratamentos. No pasto diferido foram identificados 18 famílias, 32 gêneros e 36 espécies. O capim-milh (Brachiaria plantaginea (Link) Hitch) foi o componente de maior participa o na composi o botanica da pastagem (28,72%).
Caracteriza o e Sele o de Clones de Capim-Elefante (Pennisetum purpureum Schum.) na Zona da Mata de Pernambuco
Mello Alexandre Carneiro Le?o de,Lira Mário de Andrade,Dubeux Júnior José Carlos Batista,Santos Mércia Virgínia Ferreira dos
Revista Brasileira de Zootecnia , 2002,
Abstract: O estudo visou caracterizar uma cole o de 71 clones de capim-elefante e selecionar os mais promissores para serem testados sob pastejo. A caracteriza o foi realizada na Esta o Experimental do Cedro/IPA, no município de Vitória de Sto. Ant o/PE, nas esta es chuvosa e seca. Cada clone foi representado por parcelas n o repetidas de 10 m2. Segundo análise de correla o linear, os clones mais produtivos em rela o à MS, também apresentaram maiores alturas de planta e de meristemas apicais, diametros de colmo, rela es colmo/folha (C/F), números de perfilhos basais e total e comprimentos de folha. Excetuando-se a rela o C/F, as mesmas características também correlacionaram-se positivamente com a produ o de lamina foliar (LF). Foi observada uma correla o linear positiva e altamente significativa (r = 0,9517) entre as produ es de MS e de LF. Baseando-se nos materiais que apresentaram as maiores produ es de LF/área, foram selecionados 10 clones: Mineir o/IPEACO, Hexaplóide, Mole de Volta Grande, King Grass, 591-76 ou Cameroon, CE 5 A.D., Gigante de Pinda, CE 4 A.D., Elefante da Col mbia e Vrukwona
Estimativa de parametros genéticos sob duas estratégias de avalia??o em híbridos intra e interespecíficos de capim-elefante
Assis, Liz Carolina da Silva Lagos Cortes;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Dubeux Júnior, José Carlos Batista;Cunha, Márcio Vieira da;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001200005
Abstract: the objective of this work was to evaluate the genetic parameters estimated in intra and interespecific hybrid families of elephant grass under two evaluation strategies: per se and genetically stratified mass selection. ten families of intraespecifc hybrids and ten families of interespecific hybrids were used. the characteristics evaluated were the following: plant height, plant agronomic score, dry matter content and dry matter production. it was estimated, for genetic parameters, heritability in the wide sense, variance, genetic and experimental variation coefficient and genetic, phenotypic and environmental correlation. the experiment was evaluated in a random block design with three repetitions. greater genetic variability for the studied characteristics were observed among the interespecific hybrids of elephant grass and pearl millet in comparison to the intraespecifc hybrids of elephant grass. heritability showed higher percentages for per se strategy among the studied hybrids. genetically stratified mass selection is less effective in removing the environmental effects aiming at improving experimental precision.
Avalia??o de clones de capim-elefante (Pennisetum purpureum Schum.) e de um híbrido com o milheto (Pennisetum glaucum (L.) R. Br.) submetidos a estresse hídrico. 1. Parametros morfológicos
Barreto, Glesser Porto;Lira, Mário de Andrade;Santos, Mércia Virgínia Ferreira dos;Dubeux Júnior, José Carlos Batista;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000100001
Abstract: this trial was carried out to evaluate the morphological characteristics of three elephant grass clones (cameroon, roxo de botucatu and mott) and an elephant grass with pearl millet hybrid (hv-241) submitted to two humidity regimes (with and without water stress). a randomized block design with split plots and three replicates was used. in the main plot, the effect of the humidity regimes was studied, and in the split plot, the different clones. plants submitted to water stress showed lower height, and none of them showed internodes above cutting height (10 cm). as a result of water stress, the plant height reductions were 42.7% (cameroon), 35.05% (roxo de botucatu), 28.54% (hybrid hv-241) and 27.43% (mott). leaf blade length was reduced from 69.9 cm, in the wet treatment, to 50.0 cm in those submitted to water stress, whereas leaf blade width average of water stress plants was less than a half of that in wet treatment plants. water stress did not disturb tillering of cultivars but, in hv-241 hybrid, it reduced both the number of lateral tillers/plant and total number of tillers/plant. in both humidity regimes, hybrid hv-241 was the clone, which showed the largest tillering. it was observed that, except for tillering of cultivars, water stress promoted a reduction on the other morphologic studied parameters.
Avalia??o de clones de capim-elefante (Pennisetum purpureum Schum.) e de um híbrido com o milheto (Pennisetum glaucum (L.) R. Br.) submetidos a estresse hídrico. 2. Valor nutritivo
Barreto, Glesser Porto;Lira, Mário de Andrade;Santos, Mércia Virgínia Ferreira dos;Dubeux Júnior, José Carlos Batista;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000100002
Abstract: this trial aimed to study the nutritive value of three elephant grass clones (cameroon, roxo de botucatu and mott) and an elephant grass with pearl millet hybrid (hv-241) cultivated under two different humidity conditions (with and without water stress). a randomized block design with split plots and three replicates was used. in the main plot, the effect of the humidity regimes was studied and in the split plot, the different clones. the dry matter (dm); crude protein (cp) and of neutral detergent fiber (ndf) content; and in vitro dry matter disappearance (ivdmd) were analyzed. the materials submitted to water stress showed a high dehydration level (more than 58% of dm), mainly in elephant grass cultivars. plants submitted to water stress exhibited cp content (17.8%) significantly higher when compared to those plants submitted to the water treatment (14.45%), although, among cultivars, only cameroon (14.68% cp) differed from the others (16.46%pb). as ndf contents, difference among the two humidity regimes was not observed, but mott and cameroon cultivars showed higher contents (61.79%) in relation to those of roxo de botucatu cultivar and hv-241 hybrid (56.60%). difference in ivdmd among humidity regimes was not observed neither among the different clones and the average value was 53.07%.
Avalia o de clones de capim-elefante (Pennisetum purpureum Schum.) e de um híbrido com o milheto (Pennisetum glaucum (L.) R. Br.) submetidos a estresse hídrico. 2. Valor nutritivo
Barreto Glesser Porto,Lira Mário de Andrade,Santos Mércia Virgínia Ferreira dos,Dubeux Júnior José Carlos Batista
Revista Brasileira de Zootecnia , 2001,
Abstract: O objetivo deste trabalho foi avaliar o valor nutritivo de três cultivares de capim-elefante (Cameroon, Roxo de Botucatu e Mott) e de um híbrido de capim-elefante com o milheto (híbrido HV-241), cultivados sob diferentes condi es de umidade (com e sem estresse hídrico). Utilizou-se o delineamento em blocos ao acaso com parcelas subdivididas e três repeti es. Na parcela principal, estudou-se o efeito dos regimes de umidade e nas subparcelas, os diferentes clones. Foram avaliados os teores de matéria seca (% MS), proteína bruta (PB) e fibra em detergente neutro (FDN) e a digestibilidade in vitro da matéria seca (DIVMS). Os materiais submetidos a estresse hídrico apresentaram elevado grau de desseca o (mais de 58% de MS), sobretudo os cultivares de capim-elefante. As plantas submetidas a estresse hídrico apresentaram teores de PB (17,58%) significativamente superiores aos das irrigadas (14,45%), sendo que, entre os cultivares, apenas o Cameroon (14,68% PB) diferiu dos demais (16,46% PB). Quanto aos teores de FDN, n o se verificou diferen a entre os dois regimes de umidade, mas os cvs. Mott e Cameroon apresentaram teores superiores (61,79%) aos do cv. Roxo de Botucatu e do híbrido HV-241 (56,60%). N o foi verificada diferen a na DIVMS entre os regimes de umidade nem entre os diferentes clones, sendo o valor médio de 53,07%.
Avalia o de clones de capim-elefante (Pennisetum purpureum Schum.) e de um híbrido com o milheto (Pennisetum glaucum (L.) R. Br.) submetidos a estresse hídrico. 1. Parametros morfológicos
Barreto Glesser Porto,Lira Mário de Andrade,Santos Mércia Virgínia Ferreira dos,Dubeux Júnior José Carlos Batista
Revista Brasileira de Zootecnia , 2001,
Abstract: Este trabalho foi conduzido com o objetivo de avaliar características morfológicas de três cultivares de capim-elefante (Cameroon, Roxo de Botucatu e Mott) e de um híbrido de capim-elefante com o milheto (Híbrido HV-241), submetidos a dois regimes de umidade (com e sem estresse hídrico). Utilizou-se o delineamento em blocos casualizados com parcelas subdivididas e três repeti es. Na parcela principal, estudou-se o efeito dos regimes de umidade e nas subparcelas, os diferentes clones. As plantas submetidas a estresse hídrico apresentaram menor altura e nenhuma delas apresentou internódios acima da altura de corte (10 cm). A redu o na altura das plantas, como consequência do estresse, foi de 42,7% (Cameroon), 35,05% (Roxo de Botucatu), 28,54% (híbrido HV-241) e 27,43% (Mott). O comprimento da lamina foliar foi reduzido de 69,9 cm, nas plantas irrigadas, para 50,0 cm nas submetidas a estresse, enquanto a largura da lamina foliar das plantas sob estresse correspondeu a menos da metade das plantas irrigadas. O estresse hídrico n o influenciou o perfilhamento dos cultivares, mas, no híbrido HV-241, reduziu o número de perfilhos axilares/planta e o número total de perfilhos/planta. Em ambos os regimes de umidade, o híbrido HV-241 foi o material que apresentou o maior perfilhamento. Observou-se que, com exce o do perfilhamento nos cultivares, o estresse hídrico promoveu redu o nos demais parametros morfológicos estudados.
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