Consulta: subjectFacets:"Chemigation"
Registros recuperados: 7
Data/hora: 09/06/2024 09:38:12

Potassium distribution in drip irrigation with fertigation for different injection distances in the main line
Provedor de dados: Engenharia Agrícola
Autores: Bomfim,Guilherme V. do; Manzano,Juan; Azevedo,Benito M. de; Vasconcelos,Denise V.; Viana,Thales V. de A.
The purpose of this research was to evaluate the K2O distribution uniformity by surface drip irrigation at Universitat Politecnica de Valencia, Valencia, Spain (39º 29′ N, 0º 23′ W, 20 m). The irrigation was performed by drip lines with not-compensated emitters, spaced 0.3 m. The fertigation was realized using a fertilizer injector pump of electric action with injection of 0.25 h. The experimental design used completely randomized blocks with five treatments and four replications. The treatments consisted of injection in five distances, located at 10; 20; 30; 40; 50 m of the first drip line. Samples were collected in emitters located at the start, at 1/3, at 2/3 and at the end of the drip lines. The nutrient concentration was determined by flame...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Uniformity; Chemigation; K2O.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600011

Geometry and head loss in Venturi injectors through computational fluid dynamics
Provedor de dados: Engenharia Agrícola
Autores: Manzano,Juan; Palau,Carmen V.; Benito,M. de Azevedo; Guilherme,V. do Bomfim; Vasconcelos,Denise V.
ABSTRACT To determine the influence of geometry on the hydrodynamic behavior of Venturi injectors, using computational fluid dynamics techniques, we studied, at the Universitat Politècnica de València, Valencia, Spain, the geometric parameters that exert the most influence on head losses: the relationship between throat diameter and nozzle (β), nozzle angle (α1) and diffuser angle (α2). In addition, three throat morphologies (B1: nozzle-throat and throat-diffuser with a sharp edge; B2: nozzle-diffuser with a zero-length, sharp-edge throat; B3: nozzle-throat and throat-diffuser with rounded edge). We analyzed their influence on the velocity distribution and differential pressure between inlet and throat (DP/γ), throat and outlet (Δhv/γ), and outlet and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemigation; Fertirrigation; DFC.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000300482

Limite operacional de injetores tipo Venturi em funcao de suas dimensoes e dos diferenciais de pressao.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: FEITOSA FILHO, J. C.; BOTREL, T. A.; ARRUDA, N. T. de; PINTO, J. M.; MENDONCA, F. C.
Um experimento foi instalado no Laboratorio de Hidraulica da ESALQ/USP visando avaliar o limite operacional de injetores tipo Venturi em funcao das dimensoes desses injetores e dos diferenciais de pressao disponiveis no sistema. Trabalhou-se com quatro injetores operando em diferentes condicoes hidraulicas. Dentre os resultados constatou-se que o inicio do funcionamento desses injetores deu-se proximo aos 10% dos diferenciais de pressao em relacao as pressoes de servico, e que o final do funcionamento deu-se entre 55% e 60% desse referencial. As dimensoes dos injetores influenciaram mais seus limites operacionais e desempenho que as pressoes de servico. As vazoes succionadas, as perdas de carga e os rendimentos quando avaliados em funcoes dos diferenciais...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Quimigacao; Injetor Venturi; Venturi injectors; Fertirrigação; Chemigation; Fertigation.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132032

Dry matter production and macronutrient leaf composition in lettuce under fertigation with nitrogen, potassium and silicon
Provedor de dados: Revista Brasileira de Engenharia Agrícola e Ambiental
Autores: Souza,Renan S. de; Rezende,Roberto; Freitas,Paulo S. L. de; Gonçalves,Antonio C. A.; Rezende,Graziela S.
ABSTRACT The objective of this study was to evaluate, in greenhouse, the response of the lettuce cultivar 'Vera', with respect to the marketable shoot dry matter production and macronutrient accumulation, as a function of the application of different doses of nitrogen (N) and a potassium silicate-based leaf fertilizer. The lettuce was cultivated from August 10, 2012 (sowing) to October 16, 2012 (harvest). The experimental design was completely randomized with three replicates, referring to nine treatments, resulting from the combination between top-dressing doses of N (9, 54, 90, 126 and 171 kg ha-1) and Si/K2O (1.15, 6.90, 11.50, 16.10 and 21.85 kg ha-1), using the Plan Puebla III experimental matrix, and a control treatment without fertigation. Drip...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L.; Chemigation; Dry mass; Nutritional composition.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001201166

Characterization and selection method of Venturi injectors for pressurized irrigation
Provedor de dados: Revista Ciência Agronômica (RCA)
Autores: Manzano,Juan; Palau,Carmen Virginia; Azevedo,Benito Moreira de; Bomfim,Guilherme Vieira do; Vasconcelos,Denise Vieira.
ABSTRACT Venturi-type chemigation injectors are widely used due to their advantages: they do not require electric power and are cheap to operate. However, they also generate considerable energy losses which affect the pressure in the system. The correct characterization of these systems requires pressures to be correctly set at the inlet, injector and outlet points in relation to main and injected solution flows. These analytical relationships, as described in the International Organization for Standardization’s standard ISO 15873:2002, can be obtained theoretically, although it is recommended that the manufacturer should determine the real behavior of the injector by operational tests. These relationships should also be provided graphically in the form of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemigation; Fertigation; Head losses; Nomography.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000200201

Irrigation and fertigation frequencies with nitrogen in the watermelon culture
Provedor de dados: Bragantia
Autores: Fernandes,Carlos Newdmar Vieira; Azevedo,Benito Moreira de; Nascimento Neto,Joaquim Raimundo; Viana,Thales Vinícius de Araújo; Sousa,Geocleber Gomes de.
This study evaluates the influence of different irrigation frequencies and different nitrogen fertigation frequencies on the growth performance of the watermelon (Citrullus lanatus) culture. Two experiments were conducted at the Paraguay farm in the Cruz municipality, Ceará, Brazil. They was randomized blocks design with six treatments and four replications. The irrigation frequency experiment consisted of the application of different irrigation frequencies. The treatments were: DM - daily irrigation in the morning with 100% daily dosage; DT - daily irrigation in the afternoon, with 100% daily dosage; DMT - twice daily irrigation, with 50% daily dosage in the morning and 50% daily dosage in the afternoon; 2D - irrigation every two days; 3D - irrigation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrullus lanatus; Irrigation management; Chemigation; Nitrogen fertilizing.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052014000200003

Aerial, ground and chemigation spray deposition on corn for the control of spodoptera frugiperda (lepidoptera: noctuidae)
Provedor de dados: Ciência e Agrotecnologia
Autores: Cunha,João Paulo Arantes Rodrigues da; Nascimento,Ana Paula de Castro.
Pesticides can be applied by aircraft, ground-sprayers or sprinkler irrigation. However, selecting the best option is complicated by the limited number of studies comparing these techniques. Thus, the objective of this work was to study the chlorpyrifos insecticide deposition applied by aircraft (30 L ha-1), tractor-mounted sprayer (200 L ha-1) and chemigation (70,000 L ha-1) for the control of Spodoptera frugiperda (J.E. Smith) in two corn (Zea mays L.) populations (70,000 and 100,000 plants ha-1). Active ingredient residue on the corn plant leaves was evaluated by gas chromatography, immediately and ten days after the treatments. Armyworm numbers in each plot and control were also evaluated. The experiment was set up in randomized blocks with four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecticide application technology; Fall armyworm; Chemigation; Sprayer.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000200002