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	Provedor de dados Bragantia (1) Scientia Agricola (1) Autor Azevedo,Ricardo Antunes (1) Calbo,Adonai Gimenez (1) Carvalho,Daniel Fonseca de (1) Medici,Leonardo Oliveira (1) Pimentel,Carlos (1) Rocha,Hermes Soares da (1) Silva,Washington Luiz de Carvalho e (1) Mais... Palavra-chave Water tension (2) Automation (1) Irrigas (1) Irrigation (1) Irrigation scheduling (1) Low cost (1) Porous cup (1) Tensiometer (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2010 (1) 2006 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Automatic controller to water plants Scientia Agricola Medici,Leonardo Oliveira; Rocha,Hermes Soares da; Carvalho,Daniel Fonseca de; Pimentel,Carlos; Azevedo,Ricardo Antunes. Despite the massive demand of water for plant irrigation, there are few devices being used in the automation of this process in agriculture. This work evaluates a simple controller to water plants automatically that can be set up with low cost commercial materials, which are large-scale produced. This controller is composed by a ceramic capsule used in common domestic water filters; a plastic tube around 1.5 m long, and a pressostate used in domestic washing machines. The capsule and the pressostate are connected through the tube so that all parts are filled with water. The ceramic capsule is the sensor of the controller and has to be placed into the plant substrate. The pressostate has to be placed below the sensor and the lower it is, the higher is the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigation; Water tension; Automation; Low cost. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600016 Gaseous irrigation control system: descriptions and phisical tests for performance assessment Bragantia Calbo,Adonai Gimenez; Silva,Washington Luiz de Carvalho e. Irrigas is a water tension measuring system made out of a porous cup (sensor), connected to a gas pressurizing/measuring device by a flexible tube. Water tension (T) is obtained from the equation T=Td-p or T=Ts-p, where Td is the sensor desorption critical water tension (bubbling beginning), Ts is the sensor sorption critical water tension (bubbling ceasing) and p is the applied gas pressure. Differently from conventional tensiometers, the irrigas porous cup cavity is filled with air. This characteristics makes the irrigas system nearly maintenance free and also eliminates the need of making hydrostatic pressure corrections for sensor depth. The system was tested both in the desorption and sorption modes. In the first case the Richards pressure chamber was... Tipo: Info:eu-repo/semantics/article Palavras-chave: Irrigas; Irrigation scheduling; Porous cup; Tensiometer; Water tension. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052006000300017 Registros recuperados: 2 Primeira ... 1 ... Última

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