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  • 1
    Online-Ressource
    Online-Ressource
    Desempenho de derriçadora portátil de frutos do cafeeiro
    FapUNIFESP (SciELO) ; 2005
    In:  Engenharia Agrícola Vol. 25, No. 3 ( 2005-12), p. 791-800
    Details
    In: Engenharia Agrícola, FapUNIFESP (SciELO), Vol. 25, No. 3 ( 2005-12), p. 791-800
    Kurzfassung: The portable harvester performance was evaluated for mountain coffee during the detachment of the fruits in different ages of the plants. The performance evaluation of the portable harvester was accomplished with four ages of plants and two coffee varieties. The coffee plant characteristics, the curve characteristics of the portable harvester engine, the detachment capacity and efficiency, the specific energy consumption, the mechanical damage and the noise level emitted by the machine were evaluated. The portable harvester held out a satisfactory performance by presenting less mechanical damage and number of broken branches, a regular detachment capacity, low specific energy consumption and high detachment efficiency. The noise level increased with the increasing of the power requirement.
    Materialart: Online-Ressource
    ISSN: 0100-6916
    URL: Article
    DOI: 10.1590/S0100-69162005000300026
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2005
    ZDB Id: 2182578-6
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Modelagem de máquina pneumática recolhedora de frutos de café em terreiro usando análise por elementos finitos
    FapUNIFESP (SciELO) ; 2006
    In:  Engenharia Agrícola Vol. 26, No. 2 ( 2006-08), p. 483-492
    Details
    In: Engenharia Agrícola, FapUNIFESP (SciELO), Vol. 26, No. 2 ( 2006-08), p. 483-492
    Kurzfassung: The objective of this work was the development of a mathematical model by finite element analysis, using the software ANSYS®, version 5.7, to optimize the design of a machine which collects coffee fruits on a yard. The machine modeling was based on the aerodynamic characteristics of coffee fruits and on the air flow necessary to pneumatically transport the coffee fruits. The static pressures on the machine ducts was obtained experimentally and these values were compared with the results obtained by the software ANSYS to validate the modeling. Based on the results, it was concluded that the modeling using the software ANSYS had similar results to the ones obtained experimentally, with a relative mean error of 9.2% for the simulated pressure values. Through the modeling, it was identified pressure ranges that would make the coffee fruits pneumatic transport more difficult, at some parts inside the machine. These problems were corrected and the air flow supplied by the fan was sufficient to collect coffee fruits on the ground by suction. The developed modeling fulfilled the requirements of this work which was to collect coffee fruits on the yard using pneumatic transport efficiently.
    Materialart: Online-Ressource
    ISSN: 0100-6916
    URL: Article
    DOI: 10.1590/S0100-69162006000200017
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2006
    ZDB Id: 2182578-6
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Online-Ressource
    Online-Ressource
    DYNAMIC TRACTION OF A MECHANIZED SET BASED ON TECHNICAL AND OPERATIONAL PARAMETERS
    FapUNIFESP (SciELO) ; 2017
    In:  Engenharia Agrícola Vol. 37, No. 3 ( 2017-06), p. 484-492
    Details
    In: Engenharia Agrícola, FapUNIFESP (SciELO), Vol. 37, No. 3 ( 2017-06), p. 484-492
    Materialart: Online-Ressource
    ISSN: 0100-6916
    URL: Article
    DOI: 10.1590/1809-4430-eng.agric.v37n3p484-492/2017
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2017
    ZDB Id: 2182578-6
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Spectrum of droplets produced by use of adjuvants
    SciELO Agencia Nacional de Investigacion y Desarrollo (ANID) ; 2013
    In:  Idesia (Arica) Vol. 31, No. 1 ( 2013-04), p. 27-33
    Details
    In: Idesia (Arica), SciELO Agencia Nacional de Investigacion y Desarrollo (ANID), Vol. 31, No. 1 ( 2013-04), p. 27-33
    Materialart: Online-Ressource
    ISSN: 0718-3429
    URL: Article
    DOI: 10.4067/S0718-34292013000100004
    Sprache: Englisch
    Verlag: SciELO Agencia Nacional de Investigacion y Desarrollo (ANID)
    Publikationsdatum: 2013
    ZDB Id: 2244662-X
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    Correlação linear e espacial entre produtividade de Brachiaria brizantha, densidade do solo e porosidade total em função do sistema de manejo do solo
    FapUNIFESP (SciELO) ; 2012
    In:  Engenharia Agrícola Vol. 32, No. 5 ( 2012-10), p. 909-919
    Details
    In: Engenharia Agrícola, FapUNIFESP (SciELO), Vol. 32, No. 5 ( 2012-10), p. 909-919
    Kurzfassung: Total porosity and bulk density are strongly affected by soil management, which reflects directly in agricultural productivity. The productivity of the forage, Brachiaria brizantha, in function of bulk density and total porosity was analyzed in two soil management systems, in an experiment lead in the second semester of 2009, in Santa Teresa County, state of Espírito Santo, Brazil. The purpose of the study was to evaluate the variability, and linear and spatial correlations among the attributes (plant and soil) in order to identify an indicator of soil physical quality for corn forage productivity. A geostatistical grid was installed to collect soil and plant data, with 99 sample points, in each soil management system. The studied attributes did not vary randomly and the variability was medium to low, with well defined patterns. The spatial range varied between 20.3 and 24.2 m. On the other hand, the linear correlations between the forage productivity with the soil attributes were low due to the high data number. The comments of better correlation for productivity, was the bulk density in the depth of 0.0 - 0.15 independently of the soil management system, indicating that the productivity and the density of the soil are inversely proportional. Thus, the bulk density in the 0.0 - 0.15 m soil layer proved to be a satisfactory index of the soil physical quality regarding to forage yield.
    Materialart: Online-Ressource
    ISSN: 0100-6916
    URL: Article
    DOI: 10.1590/S0100-69162012000500010
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2012
    ZDB Id: 2182578-6
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
    Online-Ressource
    Deposição e deriva de calda fungicida aplicada em feijoeiro, em função de bico de pulverização e de volume de calda
    FapUNIFESP (SciELO) ; 2005
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 9, No. 1 ( 2005-03), p. 133-138
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 9, No. 1 ( 2005-03), p. 133-138
    Kurzfassung: The fungicide application technology should provide efficient control of vegetable diseases. The objective of this study was to evaluate the deposition and the drift of fungicide sprayed in a common bean crop with different nozzles and two volumes of application. A completely randomized block design with four replications was used, in a factorial model 2 x 2: two spray nozzles (standard flat fan and hollow cone) and two spray volumes (125 and 250 L ha-1). The study of deposition was made by a tracer analysis in different positions of the crop, using spectrophotometer. The drift was evaluated using artificial targets placed outside the application area. The fungicide, with the tracer was applied three times, using a CO2 - pressurized sprayer. The results allowed the following conclusions: the flat fan and hollow cone nozzles provided similar cover of the bean leaves, both in the superior and the inferior position of the crop; the application volume of 250 L ha-1 provided higher retention of fungicide in the leaves and higher uniformity of coverage of the plants than the volume of 125 L ha-1; the droplets formed in the application with hollow cone nozzles were more favorable to the drift than the ones produced with flat fan nozzles, specially when low application volume was used; and the applications, in general, provided low deposition uniformity and high drift potential.
    Materialart: Online-Ressource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/S1415-43662005000100021
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2005
    ZDB Id: 2164420-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    Características técnicas de bicos de pulverização hidráulicos de jato plano
    FapUNIFESP (SciELO) ; 2001
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 5, No. 2 ( 2001-05), p. 334-348
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 5, No. 2 ( 2001-05), p. 334-348
    Kurzfassung: The use of spray nozzles that provide a homogeneous covering with uniform droplet spectrum is important to obtain an efficient pesticide application, without damage to the environment. Thus, the principal aim of this work was to evaluate the technical characteristics of four hydraulic spray nozzles available in the market, under different working pressures and positions in relation to the objective, seeking to supply indicators for a correct selection of spray nozzles. In a controlled atmosphere, the following parameters were determined: distribution profile, the flow, the coefficient of variation of the nozzle distribution, the volume median diameter, the number median diameter, the homogeneity coefficient, and the percentage of droplets smaller than 100 mum. In a general way, the nozzles presented satisfactory levels of distribution uniformity, working with a pressure of 300 kPa and 50 cm of height. The appraised nozzles, in agreement with the used methodology, presented a volume mode diameter of 340 mum, and the droplets spectrum was shown to be within the recommended patterns. The homogeneity coefficient of the droplet size was better with low flow and low pressure.
    Materialart: Online-Ressource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/S1415-43662001000200028
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2001
    ZDB Id: 2164420-2
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Online-Ressource
    Online-Ressource
    Eficácia do fungicida epoxiconazol aplicado via pivô central no feijoeiro
    FapUNIFESP (SciELO) ; 2001
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 5, No. 3 ( 2001-12), p. 450-455
    Details
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 5, No. 3 ( 2001-12), p. 450-455
    Kurzfassung: The fungigation of bean crops have been used in Brazil by the agriculturists since the beginning of the 1980's. However, few surveys have been conducted to evaluate the efficiency of this technique. Thus, the objectives of this work were to evaluate the efficacy of the fungicide epoxiconazol, applied through irrigation water, for the control of diseases in bean crops, under conventional and no-till systems; as well as to study the influence of depth of applied water on the fungigation efficiency. The fungicide epoxiconazol was applied on the bean crops, under conventional and no-till systems, by a center pivot system with different depths of applied water (3, 5 and 7 mm), and disease severity was evaluated for each test. The efficiency of the fungicide application by a conventional system (compression knapsack sprayer) was also evaluated. The results obtained allow us to affirm that the fungicide epoxiconazol, applied by a center pivot system, decreased the severity of bean angular leaf spot and bean alternaria leaf spot; and the depth of applied water by fungigation did not influence the efficacy of the fungicide epoxiconazol.
    Materialart: Online-Ressource
    ISSN: 1415-4366
    URL: Article
    DOI: 10.1590/S1415-43662001000300014
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2001
    ZDB Id: 2164420-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 9
    Online-Ressource
    Online-Ressource
    Avaliação do espectro de gotas de pontas de pulverização hidráulicas utilizando a técnica da difração do raio laser
    FapUNIFESP (SciELO) ; 2007
    In:  Engenharia Agrícola Vol. 27, No. spe ( 2007-01), p. 10-15
    Details
    In: Engenharia Agrícola, FapUNIFESP (SciELO), Vol. 27, No. spe ( 2007-01), p. 10-15
    Kurzfassung: The spray nozzles are one of the most important components of pesticide hydraulic sprayer. This study evaluated the droplet spectrum of hydraulic flat fan (standard and low drift) and hollow cone spray nozzles, available in the market, under different working pressures. In laboratory, droplet spectrum, using a real time laser particle size analyzer, was measured with the operating pressure of 200; 300 and 400 kPa, for flat fan, and 400; 500 and 600 kPa, for hollow cone. The results showed that: the droplet spectrum was affected by the nominal flow and by the liquid pressure; the drift potential of standard flat fan and hollow cone spray nozzles was high; the use of low drift nozzles increased the droplet diameter, which was an effective factor in drift reduction, and the technique of laser diffraction provides a robust means of measuring the droplet size produced by spray systems.
    Materialart: Online-Ressource
    ISSN: 0100-6916
    URL: Article
    DOI: 10.1590/S0100-69162007000200002
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2007
    ZDB Id: 2182578-6
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Online-Ressource
    Online-Ressource
    Sistema de preparo do solo e sua influência na atividade microbiana
    FapUNIFESP (SciELO) ; 2015
    In:  Engenharia Agrícola Vol. 35, No. 3 ( 2015-06), p. 506-513
    Details
    In: Engenharia Agrícola, FapUNIFESP (SciELO), Vol. 35, No. 3 ( 2015-06), p. 506-513
    Kurzfassung: In addition to provide appropriate environment for crops, mechanized tillage directly affects physical and biological soil properties; besides influencing microbial activity. Therefore, we aimed at assessing how different mechanized tillage systems may affect soil microbiological activities. Treatments consisted of the following soil tillage types: No-tillage (PD), conventional tillage (PC) and minimum tillage (CM). Treatments were arranged in a randomized block design. All analyses were performed at three moments: before and after soil preparation and 14 days after tillage. Collections were made in triplicate at two soil depths (0-0.10 m and 0.10 – 0.20 m). It was determined values of total organic carbon (COT), microbial biomass carbon (CBM), basal soil respiration (RBS), metabolic quotient (qCO2) and microbial quotient (qMic). No-tillage system showed higher ratios of microbial biomass carbon and soil basal respiration at 0.0 – 0.10 m depth. Therefore, no till was the system that had greater microbial activity in the soil.
    Materialart: Online-Ressource
    ISSN: 0100-6916
    URL: Article
    DOI: 10.1590/1809-4430-Eng.Agric.v35n3p506-513/2015
    Sprache: Unbekannt
    Verlag: FapUNIFESP (SciELO)
    Publikationsdatum: 2015
    ZDB Id: 2182578-6
    Standort Signatur Einschränkungen Verfügbarkeit
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