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Search Results: 1 - 10 of 211532 matches for " Eric Victor Ferreira de;Martins "
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Ciclagem e balan?o de potássio e produtividade de soja na integra??o lavoura-pecuária sob semeadura direta
Ferreira, Eric Victor de Oliveira;Anghinoni, Ibanor;Andrighetti, Marcelo Hoerbe;Martins, Amanda Posselt;Carvalho, Paulo César de Faccio;
Revista Brasileira de Ciência do Solo , 2011, DOI: 10.1590/S0100-06832011000100015
Abstract: nutrient cycling and balance in integrated crop-livestock systems (icl) are processes that involves soil, plant and animal components, beyond fertilization. animal management, by modifying soil biotic and abiotic conditions, also influences this process as it affects the residue decomposition rate. the objective was to evaluate potassium (k) cycling and balance in an icl system with grazing (black oat and ryegrass) intensities in the winter, followed by soybean cultivated in the summer. the experiment was conducted as of may of 2001 in an area in the state of rio grande do sul - brazil, on a rhodic hapludox (oxisol), under no tillage since 1991. the treatments consisted of continuous bovine grazing intensities at a pasture height of 10, 20, 30 and 40 cm, and a control (no-grazing), in a randomized block design, with three replicates. the forage/soybean cycle of 2007/08 was evaluated in this paper. to calculate k cycling, the contents accumulated in pasture, soybean and animals in one pasture-soybean cycle were considered, and the balance, "in the field" and "in the soil", of k inputs (fertilizer) and outputs (soybean grains and animal tissue) and the k remaining in plant and soil, respectively, were calculated. potassium cycling increased with increasing grazing intensity and the balance, despite negative, with a higher deficit in areas with higher grazing intensity, did not influence soybean yield.
A??o dos térmitas no solo
Ferreira, Eric Victor de Oliveira;Martins, Vanessa;Inda Junior, Alberto Vasconcellos;Giasson, Elvio;Nascimento, Paulo César do;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011005000044
Abstract: the order isoptera is well known by its potential as a plague, although the number of species that are plagues is small within the group. termites are the dominant invertebrates in tropical terrestrial environments and are spread from tropical rainforests to the savannahs, being found even in arid regions, in various habitats. these insects have a major role and are still little studied in tropical ecosystems. nutrient cycling, aeration, water infiltration of soil, bioturbation, aggregates formation and organic material decomposition, are processes influenced by the action of termites, which , directly or indirectly, affect soil and landscape formation wherever they are. we suggest that a better approach must be addressed in future researches about these insects influence in the soil under specified conditions of use and management, in sustainable food production and climate changes.
Soil aggregation in a crop-livestock integration system under no-tillage
Souza, Edicarlos Damacena de;Costa, Sérgio Ely Valad?o Gigante de Andrade;Anghinoni, Ibanor;Carvalho, Paulo César de Faccio;Oliveira, Eric Victor Ferreira de;Martins, Amanda Posselt;Cao, Eduardo;Andrighetti, Marcelo;
Revista Brasileira de Ciência do Solo , 2010, DOI: 10.1590/S0100-06832010000400033
Abstract: grazing intensities can influence soil aggregation, which can be temporarily and permanently affected. the objective of this study was to evaluate the aggregate stability in water at the end of a soybean cycle and during pasture development in a crop-livestock integration system under no-tillage and grazing intensities. the experiment was initiated in 2001, in a dystrophic red latosol, after soybean harvest. treatments consisted of pasture (black oat + italian ryegrass) at heights of 10, 20 and 40 cm, grazed by young cattle, and a control (no grazing), followed by soybean cultivation, in a randomized block design. soil samples were collected at the end of the soybean cycle (may/2007), during animal grazing (september/2007) and at the end of the grazing cycle (november/2007). the grazing period influences aggregate distribution, since in the september sampling (0-5 cm layer), there was a higher proportion of aggregates > 4.76 mm at all grazing intensities. soil aggregation is higher in no-tillage crop-livestock integration systems in grazed than in ungrazed areas.
Crescimento, nutri??o mineral e nível crítico foliar de K em mudas de umbuzeiro, em fun??o da aduba??o potássica
Neves, Orlando Sílvio Caires;Carvalho, Janice Guedes de;Ferreira, Eric Victor de Oliveira;Pereira, Natália Victor;
Ciência e Agrotecnologia , 2007, DOI: 10.1590/S1413-70542007000300006
Abstract: the umbuzeiro (spondias tuberosa arr. cam.) is original of the northeast of brazil and it is characterized by tolerance to the drought. the growth, the mineral nutrition and the foliar critical level of potassium in umbuzeiro seedlings, grown in distroferric red latosol, in function of potassium doses, were evaluated in this experiment. the experimental design was randomized blocks with four replications and six doses of potassium (0, 30, 60, 120, 240 and 480, mg dm-3). the potassium fertilization was accomplished in four applications, and the used sources were potassium sulfate and the potassium chloride. the highest production of leaves occurred in the dose of 137 mg dm-3 of potassium and the highest production of roots at the dose of 229 mg dm-3 of potassium. the foliar contents of potassium in the umbuzeiro seedlings increased with the potassium fertilization. the critical level of potassium in the leaves of the umbuzeiro seedlings ranged from 3.40 to 6.04 g kg-1.
Analysis of the stomatognathic system after anterior cruciate ligamentplasty  [PDF]
Bruno Ferreira, Gabriel Pádua da Silva, Edson Donizetti Verri, Marisa Semprini, Selma Siéssere, Victor Rodrigues Nepomuceno, Camila Melo de Carvalho, Simone Cecilio Hallak Regalo, Emanuela Martins Nepomuceno
Open Journal of Stomatology (OJST) , 2012, DOI: 10.4236/ojst.2012.22016
Abstract: Objective: The purpose of this study was to investigate the presence of postural imbalances, which can interfere with the mandible position and affect the actions of the stomatognathic system. Materials and Methods: Forty men, aged between 23 to 29 years, were selected and divided into two groups: Group I comprised 20 healthy individuals with no clinical postural change diagnosis; Group II, 20 individuals who had ACL surgical, unilateral with patellar tendon graft, paired individual to individual (age and weight). All of them were submitted to an electromyography in different clinical conditions. In addition, a condylar biomechanical assessment was performed through videogrametry. Results: In electromyography and videogrametry, a normal standard biomechanical was observed for both groups, however, Group GII—Ligamentplasty presented an inhibition of the masticatory muscles and decreased joint kinesthetic. Conclusion: Based on the results obtained, it was concluded that after the reconstruction of the ACL, individuals presented changes in the stomatog-nathic system.
Eric Victor Ferreira,Janice Guedes de Carvalho,Leilson Ant?nio de Faria Júnior,Ana Rosa Ribeiro Bastos
Pesquisa Agropecuária Tropical , 2009, DOI: 10.5216/pat.v39i2.4526
Abstract: Manganese promotes expressive effects on plant nutrition, decreasing yield at toxic or deficient levels. The research was carried out to evaluate the response of upland rice cultivars to Mn fertilization, at tillering stage, in a cohesive Yellow Latosol. The experiment followed a completely randomized design, with four replicates, with treatments arranged in a 3x5 factorial scheme. These factors consisted of three upland rice cultivars (Carisma-1999, Conai-2004, and BRSMG Curinga-2004) and five Mn rates (0 mg dm-3, 10 mg dm-3, 20 mg dm-3, 30 mg dm-3, and 40 mg dm-3). High purity MnSO4 was applied to soil as Mn source. Carisma cultivar presented the smallest dry matter production. For all cultivars, Mn content was above appropriate content levels, independently of soil applied rates. Fe and Mn content were influenced by rates and cultivars factors alone and significant difference was found for interaction between the studied factors and Ca, S, Cu, and Zn content. KEY-WORDS: Oryza sativa L.; tillering stage; Mn fertilization; micronutrients.
Métodos de remo??o da sarcotesta na germina??o de sementes de jaracatiá
Freitas, Sílvio de Jesus;Barroso, Deborah Guerra;Silva, Roberto Ferreira da;Martins, Victor Hugo Caldas Rodrigues;Freitas, Marcela Duarte Schinke;Ferreira, Patrícia Ribeiro;
Revista árvore , 2011, DOI: 10.1590/S0100-67622011000100011
Abstract: the objective of this work was to verify the effect of different removal methods of the sarcotesta of jaracatia spinosa (aubl.) a. dc. seeds on the germination percentage, (sgi) speed of germination index and length of the aerial part. the seeds were submitted to the following treatments: 1 - without sarcotesta removal; 2 - removal with friction on sieve, with sand; 3 - removal with friction on sieve with whitewash; 4 - removal with blender, 5 - removal with seeds pulpremoval and 6 - removal with chemical solution (immersion, for 30 minutes, in solution for 1.0 l of water, 3.5 ml of sodium hypochlorite, 3.0 ml of muriatic acid and 22.5g of caustic soda). the presence of the sarcotesta harms the seed germination and development. the best methods for the removal of the jaracatiá seeds sarcotesta are the friction on sieve with sand or whitewash.
Produ??o de matéria seca, teor e acúmulo de silício em cultivares de arroz sob doses de silício
Faria Júnior, Leilson Ant?nio de;Carvalho, Janice Guedes de;Pinho, Paulo Jorge de;Bastos, Ana Rosa Ribeiro;Ferreira, Eric Victor Oliveira;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000400013
Abstract: the effect of silicon (si) application on dry matter production of rice, as well as on the content and accumulation of silicon was evaluated under greenhouse conditions. the experimental design was a completely randomized design arranged in a 5 x 2 factorial structure with four replicates. the treatments consisted of a combination of five si levels (0, 0.25, 0.50, 0.75, and 1.00 g dm-3) and two rice cultivars (conai and curinga). the si application did not affect the growth and production components except the root dry matter. there was an increase in the root dry matter under si application with a maximum production of 33.57 g pot-1 in the dose of 0.38 g dm-3 si. the content and accumulation of si varied between the cultivars, increasing linearly with the si levels, except for si accumulated in the shoot, where no significant differences were observed between the cultivars.
Métodos de extra??o para quantifica??o de manganês disponível em fertilizantes
Bastos, Ana Rosa Ribeiro;Carvalho, Janice Guedes de;Ferreira, Eric Victor de Oliveira;Faria Júnior, Leilson Ant?nio de;Alcarde, José Carlos;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000700022
Abstract: the solubility of mn in different fertilizers (mnso4.h2o-p.a., mno2-p.a.+mno-ind., mno2-ind.+mno-ind., mno2-p.a., mno2-ind. and mno-ind.) was determined using different methodologies: total content and soluble contents in water, 10% h2so4, citric acid at 20 g l-1, diluted neutral ammonium citrate, (1+9) and dtpa at 0.005 mol l-1. the mn solubilities in the latter three extractors were assessed after agitation of the sample for one hour and after boiling for 5 minutes. the extraction procedure using neutral ammonium citrate (1+9), at 1:100, with agitation for one hour, was shown to be the most adequate to assess the availability of mn in fertilizers.
Concentra??o do potássio do solo em sistema de integra??o lavoura-pecuária em plantio direto submetido a intensidades de pastejo
Ferreira, Eric Victor de Oliveira;Anghinoni, Ibanor;Carvalho, Paulo César de Faccio;Costa, Sergio Ely Valad?o Gigante de Andrade;Cao, Eduardo Giacomelli;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000600016
Abstract: potassium (k) dynamics in integrated crop-livestock (icl) systems diverge from other tillage systems, because icl systems are more complex and involve, apart from the cash crop management, the presence of animals. the objective of this study was to evaluate the soil k concentration in an icl system under no-tillage with different grazing (black oat and italian ryegrass) intensities in the winter growing season and soybean cultivated in the summer. the experiment was initiated in may 2001 on the espinilho - farm, in s?o miguel das miss?es, state of rio grosso do sul, brazil, on a rhodic hapludox (oxisol), under no-tillage since 1991. the treatments consisted of different grazing intensities: 10, 20, 30 and 40 cm of pasture height, and a control (no grazing), in a randomized block design, with three replications. available k contents were originally high and remained high during the experiment, independent of the grazing intensity. potassium was stratified in a decreasing gradient from the soil surface in all situations, and was higher after pasture than after soybean. in the control area, in spite of lower k cycling, higher soil k values were found than in the grazed areas, mainly the intensively grazed, due to losses, probably caused by animal manure.
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