Santa Cruz Cabrália, Brazil
Santa Cruz Cabrália, Brazil
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Mota P.R.D.,DEAS CCA UFPI | Villas Boas R.L.,São Paulo State University | Ludwig F.,UERGS | Fernandes D.M.,São Paulo State University | Folegatti M.V.,University of Sao Paulo
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

Rapid tests to assess the nutritional status of plants gerbera can make easier the decision of any adjustments in the fertilization of the substrate. The study was conducted to evaluate nutritionally fertigated gerbera plants with increasing levels of electrical conductivity (EC), using portable meters nitrate and potassium, and chlorophyll. For this, two experiments were conducted. A randomized block design with five levels of EC (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1) and four replications was used. Cherry cultivar was used in the first experiment. In the second experiment, two cultivars (Cherry and Salmon Rose) were used. In the first experiment, the sap of the leaves was subjected to rapid testing of N-NO3 - (equipment Cardy Horiba C -141). N-NO3 - and K+ (C-131) were determined in the substrate solution. The intensity of the green leaf, in the second experiment was evaluated with portable Chlorophyll Meter. The N content in the indicator leaf in the first and N and K contents in the plant in the second experiment were determined. Rapid tests are presented as good indicators of the level of N-NO3 - and K+ in plant tissue, with the advantages of convenience and speed of determination, facilitating monitoring of fertilization of the substrate by producers and technicians.

The study aimed to evaluate the incidence of biological and physiological disorders in the field and postharvested apples cvs. Gala, Fuji and Catarina grown in four production systems: conventional, organic transition, integrated and organic. Apples were evaluated for damages related to biological and physiological disorders in the orchard and after harvest. The greatest damages were attributed to pests, especially Anastrepha fraterculus in the organic system and Grapholita molesta in the organic transition. Apples produced in organic orchards had higher damage levels caused by postharvest physiological disorders than those grown in other production systems. For apples becoming from organic orchards most of the damage was due to lenticels breakdown and degeneration ('Gala'), and bitter pit ('Fuji' and 'Catarina'). The incidence of postharvest rot was not influenced by apple production system.

De Melo G.W.B.,Embrapa Uva e Vinho | Brunetto G.,Federal University of Santa Catarina | Basso A.,UERGS | Heinzen J.,Federal University of Santa Catarina
Revista Brasileira de Fruticultura | Year: 2012

The experiment aimed to evaluate leaves nutrient content, yield and must composition in grapevines, which were submitted to the application to different forms of distribution of organic compost on the vineyard soil with Cabernet Sauvignon grapevine, grafted on 'Paulsen 1103' rootstock, at Udorthent soil, in the Southern Brazil, Bento Gonçalves city. The treatments were (T1) without organic compost; (T2) organic compost application with distribution on the soil surface, always at same side of the plant rows; (T3) organic compost application with distribution on alternate sides of the plant rows; (T4) organic compost application in holes always on the same side of the plant rows and (T5) organic compost application in holes on alternate sides of the plant rows. The weight of pruning was evaluated during winter and summer. Leaves were collected, oven-dried, weighted and total N, P, K, Ca and Mg contents were analyzed. In the harvest, the bunch number and weight, grape yield and pH, soluble solids, acidity, tartaric and malic acids in the must was evaluated. The compost distribution in holes always on the same side or in alternated sides of the plant rows, along of the years, increased the amount of dry matter of the branches pruned in the winter, especially, in the first years after your application. The application and forms of compost distribution in the soil surface or incorporated, annually on the same side of the rows or alternate sides of the plants, along the years, do not affected the yield grape, nutrient content of leaves and must composition. The organic compost should, when necessary, should be applied in the soil surface without incorporation, on the same side of the plant rows or on alternate sides of the plants row.

Farias R.M.,UERGS | Barreto C.F.,Federal University of Pelotas | Zandona R.R.,Federal University of Pelotas | Rosado J.P.,Tecnologia em Agropecuaria Integrada UERGS | Martins C.R.,Embrapa Clima Temperado
Revista Brasileira de Fruticultura | Year: 2014

This study aimed to identify the consumer profile, to characterize the frequency and the main fruit consumption habits, as well as to analyze the factors that affect the consumption of the resident population of the West regions of the state of Rio Grande do Sul in the border with Argentina and Uruguay. An exploratory survey was conducted in 2012, using a transversal and population-based approach, constituting in questionnaire application to people living in the border cities of Uruguaiana, Itaqui, São Borja and Santana do Livramento. The survey was composed of 400 consumers living in the four cities studied. The results indicate that only one third of the interviewees consume fruit daily being consumption more frequent among women. Fruits for human consumption are mainly bought in supermarkets. Among the reasons influencing fruit consumption stands out the distinction of fruit as a healthy food, and appearance is the most adopted criterion to choose the fruit. The main fruits consumed by interviewees in the region are bananas, apples, oranges, papayas and mangos, respectively. Price reduction, habit creation and improved fruit quality are important factors for the increasing consumption of fruits in this region. © 2014, Sociedade Brasileira de Fruticultura. All rights reserved.

Bazanella A.S.,Federal University of Rio Grande do Sul | Parraga A.,UERGS
Journal of Control, Automation and Electrical Systems | Year: 2016

Analysis of limit cycles in relay feedback systems is usually performed in continuous time, even though most such systems are implemented digitally. In this paper, we discuss the limitations of the continuous-time analysis, showing that even for standard plants with reasonable sampling rates its results can be considerably far from the truth. Then, we present a discrete-time analysis of relay feedback systems, providing analytical tools that overcome the limitations of their continuous-time counterparts. © 2016, Brazilian Society for Automatics--SBA.

Ludwig F.,UERGS | Fernandes D.M.,São Paulo State University | Guerrero A.C.,São Paulo State University | Villas Boas R.L.,São Paulo State University
Horticultura Brasileira | Year: 2014

The production systems on substrates have been employed in most commercial cultivation of flowers and ornamental plants, including gerbera. However, its introduction as potted flower is recent in Brazil and many studies, especially those related to the determination of substrates physical and chemical properties, which contribute to production quality are still needed. The present study aimed to assess the influence of substrates characteristics for nutrient absorption and production of potted gerbera. The experiment was carried out in greenhouse with the experimental design in randomized blocks, factorial arrangement 5×2 (5 substrates and 2 cultivars) and 4 replications. Treatments consisted of substrates with different physical and chemical characteristics and gerbera cultivars (Cherry and Red). Plants grown on substrate with pH above 7.0 had a reduction in iron absorption, resulting in lower intensity of green coloration in the leaves. Plants grown on substrate with pH below 5.0 showed toxic levels of manganese and lower dry mass. The characteristics of the substrate, especially the pH, influence the nutrients absorption and the production of potted gerbera, altering the final plant quality.

Ludwig F.,UERGS | Guerrero A.C.,São Paulo State University | Goncalves S.O.,São Paulo State University | Fernandes D.M.,São Paulo State University | Villas Boas R.L.,São Paulo State University
IRRIGA | Year: 2013

Fertigation management of gerbera crop has been many times performed inadequately, and it has been worsened when mixtures of substrates with different physical and chemical characteristics are used. Aiming at evaluating the production and quality of potted gerbera in two substrates and different levels of fertigation, the experiment was conducted in the greenhouse of the DRN/Soil Science, FCA/UNESP, Botucatu (SP). A 5 × 2 factorial randomized block design (5 levels of fertigation and 2 substrates) was adopted with 4 replications. Levels of fertigation corresponded to maintenance of 100% available water (AW) in the substrate; 100 to 80% of AW; 100 to 60% of AW; 100 to 40% of AW and 100 to 20% of AW. The substrates were as follows: 1- mixed coconut fiber (50% pellet coconut fiber and 50% coir fiber), 2- 40% red soil, 40% decomposed pine bark, 10% composition 1 (40% decomposed pine bark, 30% vermiculite and 30% carbonized rice husk) and 10% composition 2 (75% decomposed pine bark and 25% needles of pine). Plants at the marketing stage were evaluated according to the number of leaves; diameter of leaf surface; leaf area; fresh and dry phytomass of leaves, inflorescence and total plant; inflorescence number and diameter, stem diameter, plant height, leaf area rate and electrical conductivity of the substrate solution. Plants of better quality were obtained when they were maintained in levels of 100% available water and the mixed coconut fiber was used as substrate.

This article reports a case study in which the environmental performance of a public institution of higher and technical education was evaluated, based on environmental indicators in spades. The following standards series were reviewed: ISO 14000, National Quality Award in Sanitation (PNQS) and Ecoblock. The method was adapted from SBP, a set of procedures for measuring the environmental performance of an anthropic activity, composed by latent constructs and categorical indicators that explain the performance. The indicators were organized in seven constructs. According to the assessed respondents and the model, the institution reached 56.7% of the maximum possible in environmental management. Lower constructs were management of solid waste and noise pollution. The evaluation can be used for reshaping the environmental policy of the institution.

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