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Search Results: 1 - 10 of 205612 matches for " Mario de Andrade;Santos "
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Efeito da fertiliza??o fosfatada na produ??o de raízes, liteira e nodula??o de Mimosa caesalpiniifolia benth
Caldas, Glauco Gouvêa;Santos, Mércia Virginia Ferreira dos;Ferreira, Rinaldo Luiz Caraciolo;Lira Junior, Mario de Andrade;Lira, Mario de Andrade;Saraiva, Felipe Martins;
Revista árvore , 2009, DOI: 10.1590/S0100-67622009000200005
Abstract: this work aimed to evaluate the effect of phosphorus fertilization on nodulation, litter deposition and root system development of m. caesalpiniifolia benth, before and after pruning, at the itambé experimental station of pernambuco agronomical institute - ipa in pernambuco, brazil. treatments were levels of phosphorus fertilization (0, 100 and 200 kg.ha-1 of p2o5) arranged in a randomized block design with six replicates in block i and seven in block ii, with the criterion for block formation being uniformization cut date. samplings were taken before and after pruning of the aerial part root length and root, nodule and litter dry matter had similar results before and after pruning. nodule numbers before pruning were 2, 15 and 6 for 0, 100 and 200 kg.ha-1 of p2o5, respectively, and 1, 6 and 7 after pruning. average root lengths ranged from 552 to 734 cm before and from 389 to 455 cm after pruning. the number of nodules presented variation only from august to november 2005, with values from 2 to 15 and from 1 to 7 nodules, before and after pruning, respectively.
Deposi??o e acúmulo de matéria seca e nutrientes em serapilheira em um bosque de sabiá (Mimosa caesalpiniifolia Benth.)
Ferreira, Rinaldo Luiz Caraciolo;Lira Junior, Mario de Andrade;Rocha, Mallon Sampaio da;Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Barreto, Levy Paes;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000100002
Abstract: quantification of litter deposition and organic mantle accumulation are important steps on nutrient cycling studies. this study aimed to quantify litter deposition and organic mantle in a sabiá (mimosa caesalpiniifolia benth) woodlot in an experimental farm in the brazilian northeast region. twenty 0.50 x 0.50 x 0.15 m wood collectors, to quantify litter deposition, were systematically distributed over the area elevated 30 cm above the soil. deposited material was collected monthly from october 2000 to september 2001, and separated into leaves, twigs, flowers, pods and mixed portions. undecomposed organic mantle was randomly sampled nearby collector boxes, to a total of 20 monthly samples, from which a 0.30 x 0.30 m composed sample was collected. the collected material was also hand separated into leaves, twigs, flowers, pods and mixed portions. all collected material was dried at 60°c until constant weight was achieved. highest monthly litter deposition and leaf and pod fractions occurred in october, probably due to initiation of dry period. litter deposition and stock were estimated at 7830.44 kg.ha-1.year-1 and 8906.9 kg.ha-1, respectively, with the leaf fraction dominating. leaf fraction was the richest in nutrient content.
Caracteriza??o da caatinga e da dieta de novilhos fistulados, na época chuvosa, no semiárido de Pernambuco
Santana, Daniel Fernando Ydoyaga;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Ferreira, Marcelo de Andrade;Silva, Maria José de Araújo;Marques, Kleyton Alcantara;Mello, Alexandre Carneiro Le?o de;Santos, Djalma Cordeiro dos;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000100010
Abstract: the experiment was carried out to characterize a manipulated caatinga and to estimate the botanical composition and quality of diet for fistulated steers. the experiment was carried out during the rainy season from march to july, 2003. caatinga was browsed by 24 guzerá and 12 girolando breed heifers and by two esophageal fistulated steers. in caatinga, it was identified 24 families, 38 genus, and 41 species in the two studied strata (out of them, ten species were found in the diets of the animals). forage mass of herbaceous and shrubby-tree components ranged, respectively, from 6,454 and 3,495 kg dm/ha in the beginning of the experiment to 782 and 378 kg dm/ha in the end. in the shrubby-tree and in the herbaceous strata, species grouped as "other species" showed higher absolute frequency. the shrubby-tree stratum is formed mainly by legumes whereas the herbaceous stratum is formed mainly by the "other species" group. grass presence in the diet ranged from 55% in the beginning to 41.8% at the end of the experimental period. "mororó" legume and the buffel grass had high absolute frequencies, showing an expressive presence in the vegetation. leaves of mororó and non-identified grass prevailed in the diet. significant portion of forage crude protein is unavailable because it is linked to acid detergent fiber.
Consumo de matéria seca e desempenho de novilhas das ra?as Girolando e Guzerá sob suplementa??o na caatinga, na época chuvosa, em Pernambuco, Brasil
Santana, Daniel Fernando Ydoyaga;Lira, Mario de Andrade;Santos, Mércia Virginia Ferreira dos;Ferreira, Marcelo de Andrade;Santos, Djalma Cordeiro dos;Mello, Alexandre Carneiro Le?o de;Dubeux Júnior, José Carlos Batista;Araujo, Gherman Garcia Leal de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001000007
Abstract: to estimate dry matter intake and to evaluate variation on live weight of heifers, an experiment was conducted from march to july 2003, with the following supplementation strategies: no supplementation (control), cottonseed cake (1 kg); spineless cactus (10 kg); spineless cactus + 0.5 kg of cottonseed cake (5 kg). dry matter intake of native pasture was not affected by supplementation, but it affected total dry matter intake. intake of total dry matter (dm) differed among breeds with values of 5.44 and 6.75 kg/day, respectively for guzerat and girolando breeds. for animal fed cottonseed cake supplementation, total dm intake was higher than in the control group (no supplementation), however, it was similar for those under spineless cactus and cottonseed cake + spinelles cactus supplementation. daily average body weight gain (517 and 434 g/animal, respectively, for girolando and guzerat groups) did not differ among breeds neither was affected by breed ? supplementation interaction. however, among strategies of suplementation, values were significantly different and they were 412, 620, 371 and 498 g/animal/day, respectively, for control and cottonseed cake suplementation group; spineless cactus; cottonseed cake + spineless cactus. in pernambuco semiarid, 1 kg of cottonseed cake supplementation improved daily average weight gain, regardless to breed of the animal during the rainy season.
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.
Sele??o de clones de palma forrageira resistentes à cochonilha-do-carmim (Dactylopius sp)
Vasconcelos, Andréa Guimar?es Vieira de;Lira, Mario de Andrade;Cavalcanti, Vanildo Leal Bezerra;Santos, Mércia Virginia Ferreira dos;Willadino, Lilia;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009000500007
Abstract: the experiment was carried out in a greenhouse from september 2001 to january 2002 to select several prickly-pear varieties resistant to cochineal carmine. twenty pricky-pear varieties were evaluated as a completely randomized experimental design with four replicates. the plants were artificially infested. the infestation level was evaluated by a 0 - 5 scale. the most resistants clone are "miúda" and "orelha de elefante".
Uso de descritores morfológicos e herdabilidade de caracteres em clones de capim-elefante de porte baixo
Silva, Sharlyton Harysson Barbosa da;Santos, Mércia Virginia Ferreira dos;Lira, Mario de Andrade;Dubeux Junior, José Carlos Batista;Freitas, Erinaldo Viana de;Ferreira, Rinaldo Luiz Caraciolo;
Revista Brasileira de Zootecnia , 2009, DOI: 10.1590/S1516-35982009000800008
Abstract: the experiment was carried out with the objectives to evaluate the use of morphologic descriptor in the characterization and selection of dwarf elephant grass genotypes, and to evaluate the heritability of the evaluated traits. nine dwarf elephant grass clones were used (taiwan a.146 - 2.14, taiwan a.146 - 2.27, taiwan a.146 - 2.37, taiwan a.146 - 2.114, merker méxico - 6.2, merker méxico - 6.5, merker méxico - 6.31, cv. mott, and cnpgl92f198.7) was allotted to a randomized complete block design was used with three replications. the morphologic descriptors were applied every 60 days after the staging cut. a total of five cuts were performed at 60-day intervals using a height of 10 cm from ground level. among the evaluated dwarf elephant grass clones the tallest ones were more desirable, and this trait should be considered at the moment of selection. heritability estimate was high for all evaluated traits of dwarf elephant grass, varying from 66% for sheath wax to 100% for mid-rib color. the taiwan a.146 - 2.37 clone was similar to the mott cultivar. heritability values showed genetic variability among clones, detected at 60 days regrowth. some of the used morphologic descriptors allowed characterization of the evaluated genotypes. the clones taiwan a. 146-2.27, taiwan a. 146-2.37, taiwan a. 146-2.114, and merker méxico 6.31 were the tallest and showed greater total tillering intensity, and were more desirable, presenting greater potential for use under cutting.
Novo modelo de parametros concentrados aplicado à hidrata??o de gr?os
Coutinho, M?nica Ronobo;Concei??o, Wagner André dos Santos;Omoto, Edílson Sadayuki;Andrade, Cid Marcos Gon?alves;Jorge, Luiz Mario de Matos;
Ciência e Tecnologia de Alimentos , 2007, DOI: 10.1590/S0101-20612007000300005
Abstract: a new first principle model with lumped parameters was developed for the hydration of soya beans. a transient mass balance was applied to the soya beans taking into consideration two basic hypotheses:1o) variation of the volume directly proportional to the variation of the mass of the grain during the process, 2o) exponential variation of the apparent coefficient of mass transfer in function of water concentration in the soy. this model has got just two parameters, which were evaluated from adjustment of model to the measures of grain moisture along the time, at several temperatures. the results indicate that the proposed model was able to represent the hydration process, while the mass transfer coefficient depends on the temperature and it presents significant variations along the hydration.
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.
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