Modelagem da dinâmica da água e do potássio na irrigação por gotejamento superficial.

Rivera, René Nene Chipana

doi:10.11606/t.11.2005.tde-26042005-140149

Cited by 5 publications

(10 citation statements)

References 46 publications

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“…For validation of the model, the data obtained by Rivera (2004) were used in an experiment conducted in the Department of Biosystems Engineering of the Luiz de Queiroz College of Agriculture. The soil material used originated from a profile classified as Red Latosol, sandy phase, collected inside the ESALQ/USP.…”

Section: Methodsmentioning

confidence: 99%

“…Table 1 shows the physicalwater characteristics of the soil and Table 2 shows the parameters of the retention curve. Rivera (2004).…”

Section: Methodsmentioning

confidence: 99%

“…In order to simulate a dripper, Rivera (2004) used a serum calibrator previously calibrated for a flow rate of 3 L h -1 . This dispenser was located in the center of the polyethylene carton containing the soil and was coupled to a 10-liter capacity Mariotte flask by means of capillary tube, keeping the hydraulic charge constant in the flask.…”

Section: Methodsmentioning

confidence: 99%

“…Based on the temporal and spatial distribution of volumetric moisture (θ), the model was evaluated by comparing the values of θ obtained experimentally by Rivera (2004) with those obtained by the proposed model. For the comparisons between observed and simulated data the following statistical indices were used, as suggested by Legates & Mccabe (1999): Willmott concordance index (id); efficiency coefficient (E), square root of the mean error (RMSE), mean error (ME) and absolute maximum error (AMAXE).…”

Section: Methodsmentioning

confidence: 99%

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Modeling Soil Water Redistribution Under Surface Drip Irrigation

Arraes

Miranda²,

Duarte³

2019

Eng. Agríc.

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The main objective of this study was to develop a numerical model to simulate water distribution, and the shape of the wetted soil volume, resulting from a point source irrigation at the ground surface (dripper), given soil hydraulic properties and irrigation system parameters. The mathematical model was developed in Fortran 90 at the Department of Biosystems Engineering, at the Luiz de Queiroz College of Agriculture, ESALQ/USP. The computer program was structured to allow the user to input information such as: a) flow and transport related to soil properties, b) information on irrigation type, c) boundary conditions, d) simulation time, and e) water application time through irrigation. Data from another experiment carried out at the Department of Biosystems Engineering were used to validate the model. Model performance was evaluated based on Willmott concordance index, coefficient of efficiency, root mean square error, mean error, and maximum absolute error. Based on comparisons of the model deviations from the measured data and with other results reported in the literature, it was clear that the predictions of the proposed numerical model were very satisfactory.

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Section: Methodsmentioning

confidence: 99%

“…Table 1 shows the physicalwater characteristics of the soil and Table 2 shows the parameters of the retention curve. Rivera (2004).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling Soil Water Redistribution Under Surface Drip Irrigation

Arraes

Miranda²,

Duarte³

2019

Eng. Agríc.

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“…However, the modification of this initial condition resulting from the distribution of ions in the profile led to a second condition, in which the electrical conductivity of the newly applied solution and that of the solution adjacent to the dripper showed similar values, promoting the movement of the ions towards the edges of the soil container, accompanying the water flow, in search of the aforementioned stability. Another observation is based on the soil CEC (Cation Exchange Capacity) (Rivera, 2004), i.e., the potassium of the solution in the soil interacted with the content of cations. This element was therefore retained in the soil adjacent to the point of application, and the solution that flowed to the furthermost regions of the wetted soil volume showed a lower ion concentration.…”

Section: Distribution and Storage Of The Solution In The Soilmentioning

confidence: 99%

Spatial and temporal characterization of water and solute distribution patterns

Souza

Folegatti

2010

Sci. agric. (Piracicaba, Braz.)

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The use of drip irrigation and marginal water is growing rapidly in some areas, highlighting the need to develop sound fertigation practices that combine environmental and crop production concerns. In this study the spatial and temporal water and solute distribution patterns are characterized to underpin fertirrigation design and management systems. Time domain reflectometry (TDR) probes were used to monitor the distributions of potassium nitrate (KNO 3 ) and water from drippers discharging at a constant flow rate of 4 L h -1 in soil-filled containers. In the interactions between the different profiles, a gradient distribution of the solution in the soil was observed, with greater storage of solution close to the dripper, which decreased gradually as it approached the wetting front. To reduce leaching of fertigated ions, the frequent application of small amounts of solution during irrigation is recommended. Key words: TDR, drip irrigation, wetted soil volumeCaracterização espacial e temporal de padrões de distribuição da água e do soluto RESUMO: O uso de irrigação por gotejamento e água de reúso está crescendo rapidamente em algumas áreas, destacando a necessidade para desenvolver práticas de fertirrigação que combinem preocupações ambientais dentro da produção vegetal. Caracterizou-se espacial e temporalmente os padrões de distribuição da água e do soluto para auxiliar o dimensionamento e manejo de sistemas de fertirrigação. O experimento foi conduzido numa caixa de solo, com monitoramento por TDR da distribuição de solução de nitrato de potássio (KNO 3 ), aplicada via gotejador de vazão de 4 L h -1 . Observou-se distribuição em gradiente da solução no solo nas interações entre os perfis (umidade versus condutividade elétrica), sendo verificado maior armazenamento da solução próximo ao gotejador e, conseqüentemente, diminuição desta à medida que se aproxima da frente de molhamento. Sugere-se, para a redução da lixiviação dos íons fertirrigados, a aplicação de pequenos volumes de solução durante a irrigação, mas com maior freqüência. Palavras-chave: TDR, irrigação por gotejamento, bulbo molhado

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Distribuição Da Solução No Solo Aplicado Por Gotejamento Enterrado E Superficial

Barros¹,

Folegatti²,

Souza³

et al. 2010

R_I

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O objetivo do trabalho foi estudar distribuição da solução no solo fertirrigado por gotejamento enterrado e superficial. O ensaio foi conduzido na área experimental do Departamento de Engenharia Rural da ESALQ/USP - Piracicaba, SP. Para o estudo foram abertas 6 trincheiras e instaladas sondas de TDR, dispostas a 0,05; 0,15; 0,25; 0,35 e 0,45 m – profundidade, e a 0,05; 0,15; 0,25; 0,35 m – comprimento, totalizando 17 sondas por trincheira. Os tratamentos foram baseados na profundidade de aplicação (0,00 e 0,10 m) e vazão aplicada (2 e 4 L h-1): ENT2; ENT4; SUP2 e SUP4. A cada hora era aplicado 1 L de solução de KNO3, seguida de monitoramento do movimento dos íons com o TDR. Assim, foi possível verificar que: em relação aos sistemas superficiais, os íons aplicados pelos sistemas enterrados atingiram maior largura e profundidade e as maiores concentrações foram obtidas próximas aos pontos de emissão. UNITERMOS: Fertirrigação, Nitrato de potássio, Nitossolo, TDR. BARROS, A. C.; FOLEGATTI, M. V.; SOUZA, C. F.; SANTORO, B. L. SOIL SOLUTION DISTRIBUTION APPLIED BY SUB-SURFACE AND SURFACE DRIP IRRIGATION 2 ABSTRACT The aim of this work was to assess the soil solution distribution applied by sub-surface and surface drip irrigation. The trial was conducted in an experimental area at the Engineering Rural Department of ESALQ/USP - Piracicaba, SP. Six trenches were opened, and TDR probes were installed on them arranged as follow: 0.05; 0.15; 0.25; 0.35 and 0.45 m - depth, and 0.05; 0.15; 0.25; 0.35 m - length, totaling 17 probes per trench. The treatments were based on the application depth (0.00 and 0.10m) and flow rate applied (2 and 4 Lh-1): ENT2; ENT4; SUP2 and SUP4. Every hour 1 L of KNO3 solution was applied (10 L total), followed by monitoring ions movement with TDR. Thus, it was possible to verify that, in terms of surface systems, the ions applied by sub-surface drip irrigation achieved larger depth and width, and the largest concentrations were found near the emissions points. KEY WORDS: irrigation, potassium nitrate, NITOSOL, TDR

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Modelagem da dinâmica da água e do potássio na irrigação por gotejamento superficial.

Abstract: Dados Internacionais de Catalogação na Publicação (CIP) DIVISÃO DE BIBLIOTECA E DOCUMENTAÇÃO -ESALQ/USP Rivera, René Nene ChipanaModelagem da dinâmica da água e do potássio na irrigação por gotejamento superficial / René Nene Chipana Rivera. --Piracicaba, 2004

Cited by 5 publications

References 46 publications

Modeling Soil Water Redistribution Under Surface Drip Irrigation

Modeling Soil Water Redistribution Under Surface Drip Irrigation

Spatial and temporal characterization of water and solute distribution patterns

Distribuição Da Solução No Solo Aplicado Por Gotejamento Enterrado E Superficial

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