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Araujo H.S.,Agencia Paulista de Tecnologia dos Agronegocios | Cardoso A.I.I.,São Paulo State University | De Oliveira Junior M.X.,Instituto Federal Of Educacao Ciencia E Tecnologia Do Norte Of Minas Gerais | Magro F.O.,Prefeitura do Municipio de Jundiai
Revista Brasileirade Ciencias Agrarias | Year: 2015

Information about content and extraction of nutrients by plants are very important for an adequate fertilization management and they can vary in function of species, fertilization, time of the year, besides other factors. The objective of this research was to study the influence of potassium top dressing levels on macronutrients contents and extraction in shoot and fruits of zucchini, in two cultivation dates: fall (10/03 to 02/06/2010) and spring (04/08 to 03/11/2010) in field conditions, in municipality of São Manuel, SP. The experimental design was randomized blocks, with five treatments (potassium in top dressing levels: 0, 50, 100, 200 and 400 kg of K2O ha-1) and four replications. It was evaluated macronutrients content in the phase of leaf analysis, content and extraction of macronutrients in the end of cycle and macronutrients content in fruits in each weekly harvesting during all cycle. The data were submitted to the variance and to regression analysis. Potassium content in the phase of leaf analysis increased linearly in fall, and calcium decreased in spring in function of potassium levels. Potassium content in shoot at the end of cycle increased and calcium decreased in spring. Potassium content in fruits increased in both dates. Macronutrients (except magnesium) contents in fruits varied, with tendency of decreasing during the cycle. The descending order of the nutrients extracted in plants in fall was K > N > Ca > Mg > P > S and in spring was K > Ca > N > Mg > P > S.

Azevedo A.M.,Federal University of Viçosa | De Andrade Junior V.C.,Federal University of Vales do Jequitinhonha and Mucuri | Figueiredo J.A.,Federal University of Vales do Jequitinhonha and Mucuri | Pedrosa C.E.,Federal University of Lavras | And 3 more authors.
Revista Brasileirade Ciencias Agrarias | Year: 2015

In view of the need for the adoption of more sustainable agricultural systems, it is important that the breeding programs for sweet potato seek to increase, besides the productivity of roots, the productivity and quality of vines for silage making. The objective of this study was to evaluate the genetic diversity and the importance of traits related to production and quality the of silage of vines of sweet potato genotypes. The experiment was conducted on the JK Campus of the Federal University of Vales do Jequitinhonha e Mucuri, in a randomized-block design with 12 treatments and four replicates. Twelve traits of vines and silage were evaluated. Genetic variability was detected among the genotypes, allowing for the selection of divergent genotypes for future breeding programs for silage production. Genotypes BD-54 and BD-31TO were the most divergent, and so they are indicated for use in crosses aiming at the breeding of this crop for silage-making, given that the high performance per se of all evaluated genotypes has already been verified in previous studies. The Na, TDN, and NDF traits were those that most contributed to divergence.

Nunes Y.R.F.,State University of Montes Claros | Fagundes N.C.A.,State University of Montes Claros | Veloso M.D.M.,State University of Montes Claros | Gonzaga A.P.D.,Federal University of Vales do Jequitinhonha and Mucuri | And 4 more authors.
Revista Arvore | Year: 2015

This study aimed to evaluate the growth and survival of seven native tree species in different treatments in a degraded area at COPASA Reserve (Juramento, MG). Approximately 1.2 ha area was used, where 899 seedlings were planted of seven native species (Anadenanthera colubrina, Copaifera langsdorffii, Dilodendron bipinatum, Miracrodruon urundeuva, Pterogyne nitens, Schinopsis brasiliensis and Senegalia polyphylla) followed for 24 months. The area was divided into five plots of 0.24 ha, which represented the following treatments: (T1) plot sown with grass (Brachiaria sp.); (T2) plot where the pits were treated with soil conditioner; (T3) plot sown with grass and legumes (Cajanus cajan) together; (T4) plot sown with legumes; and (T5) control. The mortality percentage was higher in T2 and lower in T3, and the species C. langsdorffii (43.66%) and S. brasiliensis (11.64%) were the ones with higher and lower mortality rate, respectively. The growth (height and diameter) of seedlings was higher in T2 (24.32 ± 26.05 cm and 0.51 ± 0.37 mm; respectively) and lowest in T1 (10,82 ± 22,57 cm and 0,26 ± 0,27 mm; respectively). The species with the largest growth in height were A. colubrina and S. polyphylla, and D. bipinatum and S. brasiliensis showed the highest growth in diameter. Pterogyne nitens showed the lowest growth, and highest mortality, presenting low ability to establish in degraded environments. © 2015, Sociedade de Investigacoes Florestais. All rights reserved.

Filipe A.P.,Instituto Federal Of Educacao Ciencia E Tecnologia Do Norte Of Minas Gerais | da Silva J.R.M.,Federal University of Lavras | Trugilho P.F.,Federal University of Lavras | Fiedler N.C.,Federal University of Espirito Santo | And 2 more authors.
Cerne | Year: 2014

Work safety is of great importance in all industrial activities. The Norm NR-15 of the Brazilian law determines that the work environment be tailored to employees to minimize biological, ergonomic, physical, chemical risks and accidents. The aim of this study was to evaluate the exposure of intermittent noise in a daily dose to workers in furniture factories. Measurements were made with a sound level meter and dosimeter in a workday of eight hours in 14 furniture factories located in the South of Minas Gerais. Noise values ranged from 66.0 to 117.4 dB(A). At a dose of 8 working hours it was observed that the values exceed the tolerance limit of a unit, being from 2.76 to 30.52 for minimum and maximum units, respectively. Both noises and daily doses were superior than the values set by the NR-15-Annex 01 (BRASIL, 2008). © 2014, Federal University of Lavras. All rights reserved.

Martins M.,Federal University of Lavras | da Silva J.R.M.,Federal University of Lavras | Lima J.T.,Federal University of Lavras | Tiburcio Goncalves M.T.,São Paulo State University | Filipe A.P.,Instituto Federal Of Educacao Ciencia E Tecnologia Do Norte Of Minas Gerais
Cerne | Year: 2013

The anatomic, physical, mechanical and chemical characterization of wood provides important information for the indication of its best usage. However, to make these woods possible to become a good option in the wooden floors market, it is necessary to perform tests that simulate the real conditions of their practical use. These tests simulate the stomping of high-heeled shoes with small pressure areas, the dragging and falling of objects, the resistance to the surface abrasion and the friction offered during the walking of people. The difficulty of selection of new wood to manufacture floors is in the absence of specific physical-mechanical reference values. The present work intended to characterize the Eucalyptus clöeziana F. Muell, Eucalyptus microcorys F. Muell and Corymbia maculata Hook woods, regarding the properties of basic density, shrinkage, application of rolling roll, of static and dynamic friction, denting caused by loads applied on small areas, impact of falling steel sphere and resistance to abrasion. It was noticed that the woods may be used to the manufacturing of floors, according to results obtained and through comparisons with literature results.

Dutra T.R.,Instituto Federal Of Educacao Ciencia E Tecnologia Do Norte Of Minas Gerais | Santana R.C.,Federal University of Vales do Jequitinhonha and Mucuri | Massad M.D.,Instituto Federal Of Educacao Ciencia E Tecnologia Do Norte Of Minas Gerais | Titon M.,Federal University of Vales do Jequitinhonha and Mucuri
Revista Brasileirade Ciencias Agrarias | Year: 2014

The application of the technique of seminal minicutting in the vegetative propagation of native forest species is still recent in Brazil, requiring adjustments and development of methods for the production of seedlings. The aim of this study was to evaluate the feasibility of seminal minicutting propagation of 'copaiba' in different substrates and concentrations of butyric acid (IBA). The experiment was conducted in randomized complete block design with three replications each consisting of ten cuttings as experimental unit, in the factorial 3 x 5. The effect of three substrates (Bioplant®, 40% vermiculite + 30% rice hulls + 30% coconut fiber -40V+30CAC+30FC, 70% vermiculite + 30% rice hulls -70V+30CAC) and four doses of IBA (1.000; 2.000; 4.000 6.000 mg L -1), besides the control treatment (distilled water) was studied. The substrate 70V+30CAC is responsible for providing the highest percentage of rooting and nutrient content minicuttings 'copaiba'. The application of IBA at a concentration of 6.000 mg L-1 provides more rooting of cuttings.

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