Physical properties of a red-yellow latosol under three different systems of coffee management in the state of minas Gerais [Propriedades físicas de um latossolo vermelho-amarelo cultivado com cafeeiro em três sistemas de manejo no sul de minas Gerais]
do Carmo D.L.,Federal University of Lavras |
Dias Jr. M.S.,Federal University of Lavras |
Santo D.J.E.,Tecnologos em Cafeicultura pelo IF |
Nannetti A.N.,UNIFENAS |
Lacerda T.M.,Tecnologos em Cafeicultura pelo IF
Revista Brasileira de Ciencia do Solo | Year: 2011
In view of the different managements used in coffee production, this study aimed to quantify the changes of some physical properties of an Oxisol under four-year-old coffee, in southern Minas Gerais. Three management systems were compared to native forest. The following management systems were evaluated: mechanized coffee production (CCM), coffee without mechanization (CSM), dense coffee plantation (CA) and native forest (MN) as reference. Undisturbed samples were collected with an Uhland sampler and aluminum rings (diameter 6.35 cm, height 2.54 cm), from the layers 0-3 cm and 15-18 cm; in the latter the maximum mechanical resistance had been previously determined by a penetrometer. The coffee plantations were sampled at two points, i.e., in the wheel track and under the trees (canopy projection) under CCM and CSM management, in-between coffee rows and under the trees under CA management, and randomly in native forest, with four replications, totaling 56 samples. The physical properties soil bulk density (BD), particle density (Dp), soil resistance to penetration (RP), total pore volume (VTP), macroporosity (Ma) and microporosity (Mi) and Ma/Mi ratio were evaluated. The mechanized coffee system affected the physical properties in the wheel track, as indicated by increases in soil density and soil penetration resistance and reduced total porosity, macroporosity and Ma/Mi ratio, four years after planting. In the 0-3 cm layer, macroporosity and Ma/Mi ratio were lower in the mechanized coffee system and microporosity, and penetration resistance higher than in the deeper layer, four years after planting.
PubMed | Brazilian Agricultural Research Corporation Embrapa, UNIFENAS and Federal University of Juiz de fora
Type: Journal Article | Journal: Reproduction in domestic animals = Zuchthygiene | Year: 2016
Oocyte has been considered the major contributor for embryo thermo-tolerance. However, it was shown that sperm factors can be transferred to the oocyte during fertilization, raising the question of whether the absence of such factors could interfere on embryo thermo-tolerance. In this study, we used parthenogenesis to generate bovine embryos without spermatozoa in order to test whether the absence of sperm factors could influence their thermo-sensitiveness at early stages. In vitro fertilized (IVF) and parthenogenetic (PA) embryos at 44 h post-insemination/chemical activation were exposed to 38.5C (control) or 41C (heat shock) for 12 h and then developed for 48 h and up to blastocyst stage. Apoptosis index and expression of PRDX1, GLUT1, GLUT5 and IGF1r genes in blastocysts derived from heat-shocked embryos were also evaluated. The heat shock decreased the blastocyst rate at day seven (p < 0.05) for IVF embryos and at day eight (p < 0.01) for both IVF and PA embryos. Total cell number was not affected by heat shock in IVF and PA blastocysts, but there was an increased proportion (p < 0.05) of apoptotic cells in heat-shocked embryos when compared to controls. There was no interaction (p > 0.05) between method of activation (IVF and PA) and temperature (38.5C or 41.5C) for all developmental parameters evaluated. Expression of GLUT1 gene was downregulated (p < 0.05) by heat shock in both IVF and PA blastocyst whereas expression of GLUT5 and IGF1r genes was downregulated (p < 0.05) by heat shock in PA blastocysts. Those data show that the heat shock affects negatively the embryo development towards blastocysts stage, increases the apoptotic index and disturbed the expression of some genes in both IVF and PA embryos, indicating that the presence or absence of sperm factors does not influence the sensitivity of the bovine embryo to heat shock.
da Silva E.C.,Federal University of Säo João del Rei |
de A Pinto C.,UNIFENAS |
de Souza-Dias J.A.C.,APTA IAC |
de Araujo T.H.,Nucleo Tecnologico de Batata e Morango
Horticultura Brasileira | Year: 2011
The seed potatoes (Solanum tuberosum) are considered a key factor to ensure high productivity, quality of the tuber and a good harvest. This study was carried out at the University José Rosário Vellano (UNIFENAS), Alfenas, Minas Gerais state, Brazil, from September 2007 until September 2008 in three distinct and sequential stages. The objective was to study the effect of growth regulators applied on: (1) sprouts detached from seed-potato tubers on minituber yield, (2) sprouting minituber and (3) marketable yield originated from minitubers. Potato sprouts used were detached from seed potatoes tubers (virus free), cultivar Bintje, originated from an experimental import of sprouts from Alaska (USA), with two sizes: large sprouts (average of 25 cm) and small sprouts (average of 13 cm) and growth regulators IBA, GA3, BAP and 2,4D. The experimental design for all experiments was of randomized blocks in a factorial scheme 5x2 with three replications. The number of minitubers produced in the first stage originated from large sprouts varied significantly from 3.1 (GA3) to 7.7 (IBA) and 2.3 (IBA) to 7.9 (control), small prouts, while the weight varied from 7.5 g (GA3) to 10.6 g (IBA), large sprouts and 3.4 g (IBA) to 12.3 g (control), small sprouts. The minitubers did not show significant differences for the time of shooting which occurred within seven to eight days. Marketable production originated from minitubers varied significantly from 12.06 t ha -1 (GA3) to 29.51 t ha -1 (AIB), large sprouts and 22.11 t ha -1 (BAP) to 30.35 t ha -1 (control), small sprout. Sprouts from seed-potato tubers cv Bintje, can be used for seed tuber production and should not be treated with growth regulators. Small sprouts, detached from seed potatoes, cultivar Bintje, without treatment, should be preferred for the production of seed-potato minitubers.
Miranda J.M.,Unifenas |
Reinato R.A.O.,Ifsuldeminas |
da Silva A.B.,Unifenas
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014
The objective of this work was to create a practical and effective mathematical model for the early prediction of crops based on some phenological attributes of the plant: height, number of fruits in the 4th and 5th internodes of the plagiotropic branches, length in meters of the planted coffee row and diameter measured at the lower region of the coffee plants. The experiment was carried out in the coffee plantations of IFSULDEMINAS-campus Machado-where the productivity of four cultivars of different sizes were analysed during the 2010-2011 season: Catucaí, Mundo Novo, Ruby and Topaz. Each of these was an experimental unit, from which 10 plants were randomly chosen. Of these, 6 branches of each plant were sampled (three on the side of the rising sun, and three on the side of the sunset; two in the upper third, and two in the middle region, and two in the lower region of each plant). Data were collected at the end of February 2011. The model which considers the proportion of the coffee plant canopy in order to get closer to the real architecture of the plant was the most significant, with a coefficient of determination of 0.83.
Mantovani J.R.,UNIFENAS |
Carrera M.,2Mestranda em Sistemas de Producao na Agropecuaria UNIFENAS |
Landgraf P.R.C.,UNIFENAS |
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2015
This study was conducted with the aim to evaluate the effect of acid whey on chemical attributes of soil, dry matter production and nutrient accumulation in the corn. The experiment was conducted in pots in the greenhouse, between February and May 2012, and the experimental design was in randomized blocks, and analysed in 5 x 2 factorial scheme with four replications. The treatments consisted of 5 doses of acid whey equivalent to 0, 50, 100, 150 and 200 m3 ha-1, in the absence and presence of mineral fertilization with NPK and micronutrients. Portions of 6.4 dm3 of soil were incubated with lime, and the doses of acid whey were applied 15 days before the end of incubation. In the treatments with mineral fertilizer, part of nutrients were applied in the incubation and the rest in hand weeding. After incubation the corn seeding was done and the experiment was carried out during 47 days. The application of acid whey to the soil increases the concentrations of available P and K+, increases the dry matter yield of corn and N, P, K and Ca accumulation in the aerial parts. The acid whey in doses of up to 200 m3 ha-1 must be used associated with mineral fertilization in maize cultivation. © 2015, Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved.
Junior A.A.S.,Federal University of Minas Gerais |
Bigal M.,Merck And Co. |
Vasconcelos L.P.B.,Federal University of Minas Gerais |
Rodrigues J.,UNIFENAS |
And 5 more authors.
Headache | Year: 2012
Background. Migraine is comorbid to depression and widespread chronic pain (WCP), but the influence of these conditions on the health-related quality of life (HRQoL) of individuals with episodic (EM) and chronic migraine (CM) is poorly understood. Objective. To assess the prevalence of depressive symptoms and WCP in individuals with EM and CM, as well as to estimate the joint impact of these conditions on the HRQoL of these individuals. Methods. All women aged 18 to 65 years with a first diagnosis of EM or CM from September of 2006 to September of 2008 seen in an outpatient headache service were invited to participate. They were asked to attend a separate appointment in the service and to bring another woman of similar age that also agreed to participate. Depressive symptoms were assessed using the Beck Depression Inventory. Questions about WCP followed the protocol of the American College of Rheumatology. HRQoL was assessed using the Medical Outcome Study Short-Form 36-item Survey (SF-36). Multivariate analysis modeled HRQoL as a function of headache status, depressive symptoms, and pain using quantile regression. Results. Sample consisted of 179 women, 53 in the EM group, 37 in the CM group, and 89 in control group. Groups did not differ by demographics. Mean scores of SF-36 were 53.6 (standard deviation [SD] = 23.5) for EM, 44.2 (SD = 18.5) for CM, and 61.8 (SD = 21.5) for controls. In multivariate analysis, SF-36 scores were predicted by a CM status (P =.02; -10.05 [95% confidence interval -18.52; -1.58]) and by a Beck Depression Inventory score (P <.01; -1.27 [95% confidence interval -1.55; -0.99]). The influence of WCP in the SF-36 scores approached significance (P =.08; -0.78 [95% -1.64; 0.88]). Age did not contribute to the model. © 2012 American Headache Society.
Silva C.M.,Hemominas Foundation |
Giovani P.,Unifenas |
Viana M.B.,Federal University of Minas Gerais
Pediatric Blood and Cancer | Year: 2011
Background: Transcranial Doppler ultrasonography (TCD) is an important way of detecting risk of ischemic stroke in children with sickle cell anemia. Procedure: A random sample of 262 FS-hemoglobin children from a newborn screening inception cohort in Brazil (1998-2005) was followed up to May 2009. Pulsed TCD followed STOP protocol. Children with mean blood flow velocity <170 cm/sec in cerebral arteries were classified as low risk; between 170 and 184, low conditional risk; between 185 and 199, high conditional risk; and ≥200, high risk. Results: Median age, 6.2 years (2-11.2 years); 147 female; 13 children (5%) had ischemic stroke prior to TCD; 186/249 (74.7%) were classified as low risk; 19 (7.6%) as low conditional; 7 (2.8%) as high conditional; and 8 (3.2%) as high risk; inadequate tests, 11.6%. The probability of ischemic stroke at 10 years was 8.3% (SEM 2.3%); of stroke or high-risk TCD 15.6% (3.5%). Children with stroke or altered TCD (conditional and high risk) were compared to children with normal examinations. They were younger (P = 0.03), with lower hemoglobin (P = 0.003), higher leukocytosis (P = 0.015), and higher reticulocytosis (P < 0.001). Episodes per year of acute chest syndrome were also higher in that group, but not significantly (P = 0.09). Reticulocytosis remained the only significant variable upon multivariate analysis (P = 0.004). Basilar and middle cerebral artery velocities were significantly correlated (R = 0.55; P < 0.001). Conclusions: Probability of stroke was similar to international reports; of belonging to high-risk group, lower. High-reticulocyte count was the most important factor associated with cerebrovascular disease. Basilar artery velocity >130 cm/sec seems to be an indirect sign of an underlying cerebrovascular disease. © 2010 Wiley-Liss, Inc.
Miranda J.M.,Federal University of Alfenas |
Rigoni M.V.,UNIFENAS |
Silveira F.T.,Usina Monte Alegre
Bioscience Journal | Year: 2011
Crotalaria juncea is very usual as green manures in sugar cane crop; these experiments analyzed the efficiency of Crotalaria juncea as green manure and the interaction with chemical manures (mineral fertilizers) and organic manures using compost of "torta de filtro" in sugar cane fields. The experiments were carried out with typic dystrophic Red latosol (oxisol) in Areado city of Southern Minas Gerais, installed by Monte Alegre Group Adecoagro in the city of Monte Belo - Minas Gerais. The block design was randomized with six treatments and three replicates. The treatments were: Crotalaria juncea and organic manures with "compost of " " torta de filtro"; Crotalaria juncea and Chemical manures (mineral fertilizers); Crotalaria juncea; Organic manures with compost of "torta de filtro" Chemical manures (mineral fertilizers) and control. Response obtained was significantly higher using as green manure Crotalaria juncea associated with organic manures, in both productions sugar cane and sugar. Using only Crotalaria juncea as Green Manure in the formation of a sugar cane field was damaging to all attributes.
Mesquita J.,UNIFENAS |
Salgueiro L.,University of Coimbra |
Cavaleiro C.,University of Coimbra
Boletin Latinoamericano y del Caribe de Plantas Medicinales y Aromaticas | Year: 2013
The essential oil obtained by hydrodistillation from dry leaves of Capsicodendron dinisii (Schwancke) was analyzed using gas chromatography (GC) and gas chromatography/mass (GC/MS) spectrometry. According to GC and GC/MS analysis, the essential oil is mostly composed of sesquiterpene hydrocarbons (69.7%) and oxygenated sesquiterpenes (22.6%). Bicyclogermacrene (30.8%), E-caryophyllene (17.2%), spathulenol (13.5%) and germacrene D (7.6%) were the principal components identified in the essential oil. © 2013 Boletín Latinoamericano y del Caribe de Plantas Medicinales y Aromáticas.
Bernardes C.L.,University Jose Do Rosario Velano |
Semina:Ciencias Agrarias | Year: 2012
The study aimed to evaluate the performance of curimbas fed different levels of crude protein in the ration. The experiment lasted six months, using 3413 curimbas fingerlings, with average initial weight of 10g, distributed in five tanks of land, with 273 m 2 each, at a density of 2.5 fish / m 3. The treatments were: T1 - commercial diet with 28% crude protein, T2 - commercial diet with 32% crude protein, T3 - commercial diets with 36% crude protein, T4 - commercial diet with 40% crude protein and T5 - commercial diet with 44% crude protein. Diets were provided twice a day in a rate of 5% of body weight. The experimental design was completely randomized (CRD), in a factorial scheme 5x5, with five diets (28%, 32%, 36%, 40% and 44% CP) and five sampling times (30, 60, 90, 120 and 150 days), with 10 repetitions. The sampling for data collection were performed monthly at each stage of the experiment, and removed 10 fish per treatment, at each sample for evaluation of performance parameters. It was evaluated total length, standard length, body height and weight of animals. The data were submitted to variance analysis and treatment means to the regression with a significance of 5%. There was no statistical difference for the parameters of treatments T1, T2, T3 and T4. Only T5 presented statistical difference in all parameters studied.