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| Registros recuperados: 9.409 | |
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| Melo Neto,Biano A. de; Bonomo,Renata C. F.; Franco,Marcelo; Almeida,Paulo F. de; Pontes,Karen V.. |
| ABSTRACT The objective was to study the starch extraction process of the peach palm (Bactris gasipaes Kunth.) fruit focused on increasing yield and in preserving the quality characteristics the extracted product. Two experimental designs are carried out in order to investigate the effects of NaOH and NaHSO3 concentrations, as well as the decantation time, on the yield of starch and on product color. Firstly, a 23 full factorial design provided a linear model with 95% of confidence, indicating major tendencies for optimization. Secondly, a 22 central composite design rendered a quadratic model which allowed the maximization of yield (it 9.0% higher) without compromising the color of the product. The maximum yield of 23.90%, validated with triplicate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Design of experiments; Response surface methodology; Native starch. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100148 |
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| Goneli,André L. D.; Araujo,Willian D.; Hartmann Filho,Cesar P.; Martins,Elton A. S.; Oba,Guilherme C.. |
| ABSTRACT: The aim of this study was to adjust mathematical models to the experimental data on the peanut kernels drying in thin layer, as well as to determine the effective diffusion coefficient and the main thermodynamic properties involved in drying of the grains under different air conditions. The peanut kernels, with a water content of 0.59 ± 0.002 (dry basis, d.b.), were dried in a forced air ventilation oven with different temperature levels (40, 50, 60 and 70 °C) until reaching a water content of 0.04 ± 0.001 (d.b.). For the experimental data, eight mathematical models traditionally used to represent the drying kinetics of thin layer of agricultural products were adjusted, also being determined the effective diffusion coefficient and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arachis hypogaea L.; Effective diffusivity; Activation energy; Page model; Thermodynamic properties. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500994 |
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| Toledo,João V.; Zolnier,Sérgio; Silva,Thieres G. F. da; Boehringer,Davi; Steidle Neto,Antonio J.. |
| ABSTRACT: The aim of this research was to evaluate the effect of distinct levels of salinity on the evapotranspiration of the RB867515, RB855453, RB92579 and RB928064 sugarcane cultivars. The evapotranspiration was monitored during daytime period under meteorological conditions influenced, mainly by cloud variations. The salinity values were established by addition of 0, 50, 100 and 150 mM of Sodium Chloride (NaCl) to the nutrient solution, which was applied by fertigation, in such way that the electrical conductivity (EC) of the leached solution was near 3, 6, 10 and 13 dS m−1, respectively. The increase of the NaCl concentration in the nutrient solution affected, significantly and in a linear manner, the evapotranspiration of all sugarcane cultivars,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Efficient water use; Saccharum officinarum; Saline stress; Salinization. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500940 |
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| Miranda,Suymara T.; Matos,Antonio T.; Matos,Mateus P.; Borges,Alisson C.; Baptestin,Gheila C. F.. |
| ABSTRACT This study aimed to characterize the material composition responsible for clogging the porous medium of horizontal subsurface flow constructed wetland (HSSF–CW) systems, which is detrimental to a proper system operation. Six completely clogged HSSF–CWs were used after treatment of swine wastewater. Operating conditions of these systems were named CW–C (HSSF– CW 1 and HSSF–CW 4, non-cultivated, i.e. controls), CW–T (HSSF–CW 2 and HSSF–CW 5, cultivated with Tifton 85 (Cynodon spp.)), and CW–A (HSSF–CW 3 and HSSF–CW 6, cultivated with alligator weed (Alternanthera philoxeroides)). The results showed that most of the clogging material was composed of total fixed solids (95, 84, and 82% in CW–C, CW–T, and CW–A, respectively). However, total volatile... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Constructed wetlands; Clogging; Porous medium. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300463 |
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| Almeida,Ana J. B. de; Coelho,Silvia R. M.; Schoeninger,Vanderleia; Christ,Divair. |
| ABSTRACT Bean (Phaseolus vulgaris L.) is a traditional food in the diet of Brazilians, due to its low fat content and it is rich in vitamins, protein, fiber, carbohydrates and minerals. One of the major problems related to this product is storage without temperature and humidity control, causing quality reduction of this legume. This study aimed to evaluate the effects suffered by cooking time parameters, seed coat color, phytate and minerals (P, Ca, Mg and Mn) content during storage. The grain varieties: BRS Madrepérola, BRS Estilo, BRS Pontal and CNFC 10467, from the pinto group, were stored in hermetic acrylic containers with humidity and temperature controlled for a period of 108 days. All varieties had better results of the parameters studied when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cooking time; The integument color; Content of phytates. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300529 |
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| Lima,Elvis M. de C.; Carvalho,Jacinto de A.; Viol,Miguel A.; Almeida,Rodrigo C. de; Rezende,Fátima C.. |
| ABSTRACT The study aimed to evaluate the “Gália” melons productive characteristics grown in greenhouse under different irrigation levels, and conducted with and without soil cover by plastic mulching. Experiments I (WC) and II (WtC) were conducted simultaneously in a protected environment, using a completely randomized design (CRD), where plants of Gália melons (Hybrid Nectar cv.) received five levels of water depth defined by 50, 75, 100, 125 and 150% of evapo-transpiration (water requirement), with four replications, differing only by utilization (WC) or not (WtC) of plastic mulching. The results showed that the variables productivity, average weight, length and diameter of the fruits were affected by different levels of water replacement in the soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Irrigation management; Protected environment; Productivity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100075 |
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| Assis,Tatiane M. de; Schilichting,Marcos V.; Lopes,Carla L.; Kunz,Airton; Gomes,Simone D.. |
| ABSTRACT The aim of this study was to monitor the stabilization of a sequential batch reactor (SBR) regarding the partial nitritation of poultry slaughterhouse wastewater, aiming at preparing it for a reactor with bacteria that promote anaerobic ammonia oxidation (anammox). A cylindrical reactor with a useful volume of 3.5 L, mechanical agitation (50 rpm), and suspended biomass was used in the experiment. The strategies adopted for nitrite-oxidizing bacteria (NOB) inhibition were cycle time (CT: 24, 16, 6, 5, 4 h and real-time monitoring), free ammonia accumulation, alkalinity restriction and low concentrations of dissolved oxygen (DO). The ammonification process, observed at all experimental phases, negatively influenced the control of partial nitritation... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anammox; Deammonification; Nitrite; Nitrate; Nitrafying. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200323 |
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| Melo,Mariana C.; Tavares,Laene F.; Oliveira,Thaísa F.; Silva,Rodrigo R.; Carvalho Filho,Alberto. |
| ABSTRACT: The effects of natural weathering and different managements performed in agriculture may best be understood by studying the soil roughness. The aim of this study was to evaluate the optimization of the use of pin microrelief meter, an instrument used to determine the soil surface roughness, as the number of readings collected over traditional methodology proposed in the bibliography. The study was conducted in Rio Paranaiba (MG), in a Haplustox soil. The experimental design was completely randomized in a 2×3 factorial design with four replications. There were combined two types of primary tillage: conventional tillage with disc plow (PCAD) and harrow (PCGA), and three amounts of readings (100, 200, and 300 reading points) sampled in each... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mobilization; Pin microrelief meter; Roughness; Soil tillage. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000501056 |
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| Sanches,Arthur C.; Gomes,Eder P.; Rickli,Max E.; Friske,Elcio; Fasolin,Julia P.. |
| ABSTRACT The pasture irrigation has expanded, mostly in small areas in order to boost the production system, along with the use of soil improvement techniques and high-productivity grasses. Thus, this study, carried out on a small dairy farm property, aimed to evaluate the productivity, botanical composition and nutritive value of Tifton 85 with different nitrogen (N) doses, in the presence and absence of irrigation. The experimental design was a randomized block in a split-plot design with four replications, plots Non-irrigated and Irrigated. The subplots consisted of nitrogen doses: 25 kg ha−1 cycle−1 of N, 50 kg ha−1 cycle−1 of N, 75 kg ha−1 cycle−1 of N and 100 kg ha−1 cycle−1 of N. The irrigation increased the productivity in an average of 3,626.5 kg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neutral detergent fiber; Acid detergent fiber; Tensiometry; Cynodon ssp. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200246 |
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| Pereira,Emanuele G.; Martins,Marcio A.; Mendes,Mariana dos S. A.; Mendes,Leonardo B. B.; Nesi,Adriano Nunes. |
| ABSTRACT: The use of microalgae as a source of raw material for biofuel production has been highly targeted. Compared to other biological options for the capture and use of CO2, microalgae crops have the following advantages: high productivity, lack of competition with feed and food-based products, use of unproductive and non-arable land, and allowance of the use of wastewater for its cultivation. The use of wastewater from industrial, agricultural, and domestic sewage has been indicated as an alternative means to reduce the cost of crops, since such waste is generally released into the environment without previous treatment. This work addresses the use of petrochemical wastewater (ARP) from effluent produced at the Gabriel Passos Refinery (Petrobrás... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wastewater treatment; Microalgae; Biofuel. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000501041 |
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| Filgueiras,Roberto; Nicolete,Donizeti A. P.; Carvalho,Tânia M. de; Cunha,Antonio R. da; Zimback,Célia R. L.. |
| ABSTRACT: The measurements obtained by remote sensing are influenced by issues related to relief. Based on that, this paper aims to analyze the spatial and temporal dynamics of the net radiation (Rn), considering the influence of topographic parameters on it, in Edgárdia Experimental Farm (FEE). It was used the methodology based on the SEBAL algorithm (Surface Energy Balance Algorithm for Land) to estimate the net radiation by orbital images. In order to assess the topographic influence on the computing of net radiation, three methodologies were applied: without topographic correction (RnSem), cosine correction (RnCos) and C correction (RnC). These methodologies were applied on 21 images of the orbital platform Landsat-5/TM, from 1985 up to 2010. Due to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Topographic correction; SEBAL; Biophysical parameters. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000501028 |
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| Beneduzzi,Humberto M.; Souza,Eduardo G.; Bazzi,Claudio L.; Schenatto,Kelyn. |
| ABSTRACT: Optimization of N management is one of the great challenges to be overcome in grain production, as it is directly related to productivity and can also cause environmental damage. Precision agriculture aims to solve this problem by applying nitrogen fertilizer at varying rates. Reflectance sensors are instruments capable of estimating N needs in various crops, including grain crops. However, it is not clear how these sensors perform under varying solar radiation and cloud cover, due to a lack of research on their temporal variability. Thus, this study examined the temporal variability of the NDVI (normalized difference vegetation index), as measured by an active reflectance sensor, in both soybean and wheat crops. The NDVI data were collected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Remote sensing; Vegetation index; NDVI. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400771 |
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| Gondim,Rubens S.; Evangelista,Sílvio R. M.; Maia,Aline de H. N.; Duarte,Aryberg de S.. |
| ABSTRACT The aim of this study was to evaluate the impacts of climate change on irrigation water demand of melon plants grown in Jaguaribe-Apodi Irrigation District (DIJA), which is located between the states of Ceará and Rio Grande do Norte, in Northeastern Brazil. Future scenarios were developed using the Eta-CPTEC/HadCM3 climate change projections, after being submitted to downscaling method. We used a set of climate data from the same model for the period of 1961 through 1990, and further projections after bias correction. Local geographic coordinates were interpolated using GIS techniques. Reference evapotranspiration (ETo) was estimated from the monthly minimum and maximum mean temperatures, using a limited data method. The rainfall, temperature,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Evapotranspiration; GIS techniques; Irrigation; Cucumis melo L. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300591 |
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| Rosa,Danielle M.; Sampaio,Silvio C.; Pereira,Pâmela A. M.; Reis,Ralpho R. Dos; Sbizzaro,Mariana. |
| ABSTRACT: Soil application of swine wastewater for nutrient cycling may represent a correct destination of these residues and reduction in production costs. However, when applied to soil, such residue may cause environmental impacts. This study aimed to analyze the chemical characteristics of the soil, corn, and leachate after successive swine wastewater applications associated with mineral fertilization. The experiment was developed in drainage lysimeters under field conditions. Wastewater doses applied were 0, 100, 200, and 300 m3 ha−1 with and without mineral fertilization. The results were submitted to analysis of variance and Tukey's test. After nine years of application, a special attention should be taken regarding water quality from a dose of 200... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Liquid residue of swine; No-tillage; Water reuse. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400801 |
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| Perin,Gismael F.; Schlosser,José F.; Galon,Leandro; Rodrigues,Fabrício A.; Frantz,Ulisses G.. |
| ABSTRACT The use of fuels for agricultural Diesel engines cycle, both of mineral origin (Diesel) or vegetable and animal origin (biodiesel) can significantly alter its performance. Therefore, the aim of this study was to quantify the change in torque, power and consumption of agricultural Diesel engine fuel using minerals and vegetables fuels. It was used a tractor power take-off coupled to a magnetic brake dynamometer (for measuring speed and torque for subsequent calculation of power), and a flow meter (for measuring the hourly fuel consumption and specific fuel consumption calculation). Eleven different fuels (S10 mineral diesel with 5%, 10%, 15%, 20% and 50% biodiesel and mineral diesel S500 with 5%, 10%, 15%, 20% and 50% biodiesel, have been used pure... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Test; Dynamometer; Tractor; Torque; Power. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100091 |
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| Graziano,Carlos E. P. L.; Alves,Karina A.; Gandolfo,Marco A.; Dario,Gustavo; Oliveira,Rone B.. |
| ABSTRACT: Spraying of crop protection products can be affected by weather conditions and spray nozzles, altering deposition patterns and coverage of the target surface. The objective of this research was to analyze the quality of sprayings performed in three periods of the day (9:00 am, 2:00 pm, and 6:00 pm), using two different droplet sizes (fine and coarse) in soybeans. Coverage and deposition were evaluated in the upper, middle, and lower portion of soybean canopy. Spraying the products at 2:00 pm increased leaf coverage in the medium portion but also increased losses to the soil. Spray nozzles with fine droplet sizes provided greater coverage and deposition in the medium and upper portion of the crop for the sprayings performed in the morning. If... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coverage; Deposition; Endo-drift; Spraying time; Application technology. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601183 |
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| Sanches,Cássio F.; Costa,Edilson; Costa,Geany G. S. da; Binotti,Flávio F. da S.; Cardoso,Eliana D.. |
| ABSTRACT The Brazilian copal is a tree fruit species that can be used for various purposes. The study evaluated protected environments and substrates in forming Brazilian copal seedlings (Hymenaea courbaril), at the State University of Mato Grosso do Sul, Cassilândia-MS, from January to March, 2014. Two greenhouses were used: (A1) agricultural greenhouse covered with aluminized thermal reflector screen of 50% shading and (A2) agricultural greenhouse covered with black screen of 50% shading. Inside the greenhouses, substrates derived from mixtures of cattle manure, soil, medium vermiculite, super fine vermiculite and washed fine sand were tested. For each cultivation environment, a completely randomized experimental design was used. The environments were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hymenaea courbaril; Solar radiation; Reflective covered; Cattle manure; Vermiculite; Humus; Sand. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100024 |
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| Registros recuperados: 9.409 | |
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