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  • 1
    In: Revista Brasileira de Ciência do Solo, FapUNIFESP (SciELO), Vol. 31, No. 5 ( 2007-10), p. 1141-1151
    Abstract: Based on a detailed analysis of the process of water infiltration into the soil, an alternative is proposed to adjust the input parameters of the Green-Ampt-Mein-Larson (GAML) model to optimize infiltration estimates of some Brazilian soils. The adjustments consisted of the replacement of the parameters saturated hydraulic conductivity (K0) by stable infiltration rate (Tie) and soil moisture saturation (q s) by water content in the transmission zone (q w). Moreover, an equation was established to estimate the matric potencial at the wetting front (y f), based on the parameters of the water retention curve of Brooks and Corey. The performance of the set of proposed adjustments (GAML-t) was evaluated for the estimation of water infiltration in three soil types. The performance of GAML-t was compared with the original GAML and adjusted to five different situations. GAML-t performed best in the three soils under study.
    Type of Medium: Online Resource
    ISSN: 0100-0683
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2007
    detail.hit.zdb_id: 2145594-6
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  • 2
    In: Revista Brasileira de Ciência do Solo, FapUNIFESP (SciELO), Vol. 36, No. 2 ( 2012-04), p. 377-388
    Abstract: The purpose of this study was to evaluate the influence of successively repeated precipitation patterns applied to bare and to covered soil, to quantify their effect on the formation of a soil crust and, consequently, on the soil water infiltration rate (Ti). Three rainfall events were simulated in 24 h intervals, with constant, decreasing exponential, early and late double exponential precipitation patterns, at a rainwater amount corresponding to 55 mm. The decrease factor of the infiltration rate (Ti) was adjusted as a function of the accumulated kinetic energy of the rainwater, called factor f, given by the ratio between the stable infiltration rate (Tie) affected by rain, and Tie with no effect of rain. Two situations of soil cover were evaluated: bare soil and soil covered with crop residues. A rainfall simulator was used in the infiltration experiments, on 1.0 x 0.7 m plots. The results were evaluated by graphical analysis, analysis of variance and means testing. It was found that the different precipitation profiles did not affect Ti of bare or covered soil. The Ti values were only influenced by successive rainfall, and the water infiltration rate was lowest after the 2nd and 3rd application. The decrease in Ti of bare soil was due to a crust on the soil surface, which was first formed after the 1st application. The stable infiltration rate (Tie) on bare soil decreased by 75 % when compared to Tie of covered soil. The infiltration depth was not influenced by any of the tested rainfall patterns. The factor f was described by an exponential equation.
    Type of Medium: Online Resource
    ISSN: 0100-0683
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2012
    detail.hit.zdb_id: 2145594-6
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  • 3
    Online Resource
    Online Resource
    FapUNIFESP (SciELO) ; 1999
    In:  Revista Brasileira de Engenharia Agrícola e Ambiental Vol. 3, No. 2 ( 1999-08), p. 217-221
    In: Revista Brasileira de Engenharia Agrícola e Ambiental, FapUNIFESP (SciELO), Vol. 3, No. 2 ( 1999-08), p. 217-221
    Abstract: ABSTRACT In order to evaluate the movement of the aldicarb sulfone insecticide in soil and to obtain the parameters for the equation of the dispersive-convective model, which describes pesticide mobility, soil columns were prepared with disturbed soil samples from the principal potato growing regions in the state of Minas Gerais, Brazil. The experiment was based on movement of solutions, under steady- state conditions, for the concentration range recommended by the manufacturer. The effluents of the soil columns were analyzed by gas chromatography techniques. The dispersive-convective equation model was efficient to describe the mobility of the product in the soil. The sorption of the aldicarb sulfone by soil was low, which resulted in retardation factors close to 1.0 and high slopes of breakthrough curves. It was also possible to verify the direct correlation between the hydrodynamic dispersion coefficient and the mean pore-water velocity.
    Type of Medium: Online Resource
    ISSN: 1415-4366
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 1999
    detail.hit.zdb_id: 2164420-2
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  • 4
    Online Resource
    Online Resource
    FapUNIFESP (SciELO) ; 2010
    In:  Revista Brasileira de Ciência do Solo Vol. 34, No. 2 ( 2010-04), p. 299-308
    In: Revista Brasileira de Ciência do Solo, FapUNIFESP (SciELO), Vol. 34, No. 2 ( 2010-04), p. 299-308
    Abstract: The technique of TDR (time-domain reflectometry) is an important tool for the study of soil water content. For a correct use of this technique, models that relate the volumetric water content in soil with the soil dielectric constant must be calibrated, considering the characteristics of each soil. The purpose of this study was to evaluate the influence of soil type and sampling form (disturbed and undisturbed samples) on the dielectric constant (Ka) of the soil and the performance of models to estimate the volumetric water content in soil (θ) by TDR. The soils were a Haplic Cambisol, an Oxisol and a Typic Quartzipsamment, with different textures. Disturbed and undisturbed Haplic Cambisol and Oxisol samples were collected, but only disturbed Typic Quartzipsamment samples, due to its low aggregation. Calibration was performed with probes consisting of three rods (effective length 0.10 m and resin length 0.05 m), spaced 0.017 apart and without resistor on the center rod, connected to a TDR 100 (Campbell Scientific) equipment. The Ka values, for a same è value, were affected by variation of the soil type, but not influenced by the type of soil sampling (disturbed or undisturbed). For the models tested to estimate è as a function of Ka, the cubic polynomial model fit the θ data determined by gravimetry best for the Typic Quartzipsamment and Haplic Cambisol, whereas for the Oxisol a linear model fit better.
    Type of Medium: Online Resource
    ISSN: 0100-0683
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2010
    detail.hit.zdb_id: 2145594-6
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  • 5
    Online Resource
    Online Resource
    FapUNIFESP (SciELO) ; 2013
    In:  Revista Brasileira de Ciência do Solo Vol. 37, No. 2 ( 2013-04), p. 411-421
    In: Revista Brasileira de Ciência do Solo, FapUNIFESP (SciELO), Vol. 37, No. 2 ( 2013-04), p. 411-421
    Abstract: Soil water infiltration modeling is an important tool to predict soil water redistribution, soil erosion, aquifer recharge and aquifer contamination. This paper presents a model to simulate soil water infiltration (GAML-c), based on the Green-Ampt-Mein-Larson (GAML) model that provides a description of the geometry and advance of the wetting front in the soil. Experimental infiltration tests were performed in Red-Yellow Oxisol (LVA). GAML-c was evaluated in four scenarios: considering hydraulic conductivity (K0) equal to the stable infiltration rate (Tie) and the maximum soil moisture equal to θw (TW); considering the K0 value determined by constant-head permeameter method and the maximum soil moisture equal to θw (KW); considering K0 equal to Tie and the maximum soil moisture equal to θs (TS); and considering the K0 value determined by the constant-head permeameter method and the maximum soil moisture equal to θs (KS). It was verified that for the scenario TW, the GAML-c model was able to simulate the soil water profile and provide satisfactory predictions of infiltration.
    Type of Medium: Online Resource
    ISSN: 0100-0683
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2013
    detail.hit.zdb_id: 2145594-6
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  • 6
    In: Engenharia Sanitaria e Ambiental, FapUNIFESP (SciELO), Vol. 22, No. 5 ( 2017-10), p. 821-828
    Abstract: ABSTRACT Reliable quantification of biochemical oxygen demand exerted (exerted BOD) can be obtained by incubating samples at different temperatures, since the amount of ultimate biochemical oxygen demand (UBOD) does not change in these conditions. Some authors have found increased UBOD values with rise in temperature of incubating samples, which could be due to the occurrence of nitrification, the acclimatization or the inadequacy of modeling of carbonaceous oxygen demand (exerted BOD) progression. This study aimed to evaluate the effect of temperature on the progression of exerted BOD and UBOD values in samples of raw domestic sewage, checking which model best fits the data. The results indicated low influence of incubating sewage samples temperature on UBOD values, being that both models, first and second order, described properly the exerted BOD progression.
    Type of Medium: Online Resource
    ISSN: 1809-4457 , 1413-4152
    Language: Portuguese
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2017
    detail.hit.zdb_id: 2203704-4
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  • 7
    Online Resource
    Online Resource
    Instituto de Pesquisas Ambientais em Bacias Hidrograficas (IPABHi) ; 2013
    In:  Ambiente e Agua - An Interdisciplinary Journal of Applied Science Vol. 8, No. 2 ( 2013-08-29)
    In: Ambiente e Agua - An Interdisciplinary Journal of Applied Science, Instituto de Pesquisas Ambientais em Bacias Hidrograficas (IPABHi), Vol. 8, No. 2 ( 2013-08-29)
    Type of Medium: Online Resource
    ISSN: 1980-993X
    Language: Unknown
    Publisher: Instituto de Pesquisas Ambientais em Bacias Hidrograficas (IPABHi)
    Publication Date: 2013
    detail.hit.zdb_id: 2389901-3
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  • 8
    In: IRRIGA, Brazilian Journal of Irrigation and Drainage - IRRIGA, Vol. 22, No. 4 ( 2017-12-20), p. 832-846
    Abstract: COEFICIENTE DE CULTIVO E EXTRAÇÃO DE NITRATO E POTÁSSIO DA BANANEIRA ‘PRATA GORUTUBA’  BEATRIZ SANTOS CONCEIÇÃO1; EUGÊNIO FERREIRA COELHO2; MAURO APARECIDO MARTINEZ3; JOSÉ ANTONIO DO VALE SANT’ANA4; JOÃO JOSÉ DA SILVA JUNIOR5 E ALISSON JADAVI PEREIRA DA SILVA6 ¹ Instituto Federal do Mato Grosso, IFMT, Avenida Vilmar Fernandes,300,Confresa-MT,e-mail: biasantos1@hotmail.com²Embrapa Mandioca e Fruticultura, Rua Embrapa s/n, caixa postal 007, Cruz das Almas- BA, e-mail: eugenio.coelho@embrapa.br 3Departamento de Engenharia Agrícola ,UFV, Avenida Peter Henry Rolfs, s/n, Campus Universitário, Viçosa – MG. CEP: 36570-900,  e-mail: mmauro@ufv.br4Instituto Federal do Mato Grosso, IFMT, Avenida Vilmar Fernandes,300,Confresa-MT,e-mail: jose.santana@cfs.ifmt.edu.br5Universidade de Brasília, UNB, Campus Universitário Darcy Ribeiro, Brasilia-DF,e-mail: joaojsjunior@outlook.com6Instituto Federal Baiano, IFBaino,Estrada da Igara, s/n-Zona Rural, Senhor do Bonfim-BA e-mail: alissonagr@gmail.com)  1 RESUMO Objetivou-se com este estudo determinar o coeficiente de cultivo (Kc) para bananeira ‘Prata Gorutuba’ e avaliar a quantidade de nitrato e potássio extraído pela cultura em lisímetro de drenagem, em condições de fertirrigação. Os tratamentos utilizados foram obtidos pela combinação de dois tipos de solos de textura distinta (Argiloso arenoso e Areia franca) e três concentrações (3,0 g L-1, 6,0 g L-1 e 9,0 g L-1) para aplicação do nitrato de potássio na água de irrigação, que foram distribuídos em delineamento experimental inteiramente casualizado com quatro repetições. Os maiores valores médios da evapotranspiração foram obtidos para o solo argilo arenoso, fato refletido no Kc, em que esse solo apresentou maiores valores, o que pode ser atribuída as diferenças de evaporação da água no solo. Em todas as três concentrações avaliadas a quantidade de nitrato e potássio extraído foi crescente até a fase de floração, havendo decréscimo na fase de floração a frutificação, sendo as quantidades de potássio extraído superiores aos valores de nitrato. Verificou-se que qualquer uma das três concentrações (3,0; 6,0 e 9,0 g L-1) podem ser utilizadas na fertirrigação com nitrato de potássio sem prejuízos para cultura, conforme os valores de nitrato observados na solução do solo que ficaram dentro dos limites aceitáveis (abaixo de 400 mgL-1). Palavras-chave: Evapotranspiração; Fertirrigação; Absorção.  CONCEIÇÃO, B. S.; COELHO, E. F.; MARTINEZ, M. A.; SANT’ANA, J. A. V.; SILVA JUNIOR, J. J. da; SILVA, A. J. P. daCROP COEFFICIENT AND EXTRACTION OF NITRATE AND POTASSIUM FROM “PRATA GORUTUBA” BANANA    2 ABSTRACT The objective of this paper was to determine the cultivation coefficient (Kc) for “Prata Gorutuba” banana and to evaluate the amount of nitrate and potassium extracted by the crop in a drainage lysimeter under fertigation conditions. The treatments were obtained by the combination of two types of different textured soils and three concentrations for the application of potassium nitrate in irrigation water, which were distributed in a completely randomized experimental design with four replications. The highest mean values of evapotranspiration were obtained for sandy clay soil, a fact reflected in Kc, in which this soil had higher values, which can be attributed to differences in water evaporation in the soil. In all three concentrations evaluated, the amount of nitrate and potassium extracted increased until the flowering phase, with fruiting decreasing in the flowering phase, with the amount of potassium extracted being higher than the nitrate values. It was found that any of the three concentrations (3, 6 and 9 g L-1) can be used in fertigation with potassium nitrate without crop damage, according to the nitrate values observed in the soil solution, which were within acceptable limits (Below 400 mgL-1). Keywords: Evapotranspiration; Fertigation; Absorption.
    Type of Medium: Online Resource
    ISSN: 1808-8546 , 1413-7895
    URL: Issue
    Language: Unknown
    Publisher: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publication Date: 2017
    detail.hit.zdb_id: 2410931-9
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  • 9
    In: IRRIGA, Brazilian Journal of Irrigation and Drainage - IRRIGA, Vol. 1, No. 01 ( 2012-05-29), p. 250-
    Type of Medium: Online Resource
    ISSN: 1808-3765 , 1808-3765
    URL: Issue
    Language: Unknown
    Publisher: Brazilian Journal of Irrigation and Drainage - IRRIGA
    Publication Date: 2012
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  • 10
    In: Ciência Florestal, Universidade Federal de Santa Maria, Vol. 24, No. 1 ( 2014-03-30), p. 127-135
    Abstract: http://dx.doi.org/10.5902/1980509813330Este trabalho teve como objetivo avaliar o efeito de diferentes proporções de ARS (Água Residuária da Suinocultura) e duas idades das mudas de Eucalyptus urophylla na sua qualidade morfológica. O experimento foi instalado na Área Experimental de Hidráulica, Irrigação e Drenagem do Departamento de Engenharia Agrícola da Universidade Federal de Viçosa (UFV), em Viçosa, MG, dentro de casa de vegetação. O experimento foi composto por 10 tratamentos em um esquema fatorial 5 x 2 (5 proporções de ARS complementadas com adubação nitrogenada de cobertura e 2 idades das mudas), com número de repetições diferentes, o delineamento estatístico utilizado foi o de blocos casualizados. Para acompanhar o crescimento das mudas da espécie estudada foram avaliadas, aos 75 e 90 dias após a semeadura, as seguintes características morfológicas: altura da parte aérea (H), diâmetro do coleto (DC), massa seca da parte aérea (MSPA), massa seca da raiz (MSR), massa seca total (MST), relação da altura da parte aérea/diâmetro do coleto (H/DC), relação da massa seca da parte aérea/massa seca da raiz (MSPA/MSR) e o índice de qualidade de Dickson (IQD). Os resultados obtidos permitiram concluir que a proporção correspondente a 50% de ARS é a que resulta em melhores características morfológicas das mudas de eucalipto. As mudas apresentaram-se aptas ao plantio no campo somente aos 90 dias após a semeadura.
    Type of Medium: Online Resource
    ISSN: 1980-5098 , 0103-9954
    Language: Unknown
    Publisher: Universidade Federal de Santa Maria
    Publication Date: 2014
    detail.hit.zdb_id: 2194052-6
    SSG: 23
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