Improving water use efficiency

Lea, Peter J.; Parry, M. A. J.

doi:10.1111/j.1744-7348.2008.00301.x

Annals of Applied Biology

2008

DOI: 10.1111/j.1744-7348.2008.00301.x

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Improving water use efficiency

Peter J. Lea

M. A. J. Parry

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Cited by 2 publications

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“…There is therefore, an urgent need to develop integrated and sustainable approaches that will increase production per unit area. The revolution in genomic technologies and application of biotechnologies to breeding (Talamè et al, 2008;Parry et al, 2009) should facilitate the generation of crops that can produce more with lower inputs (Lea & Azevedo, 2007;Parry & Reynolds 2007;Lea & Parry 2008).…”

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Food security and drought

Parry

Lea

2009

Annals of Applied Biology

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mentioning

confidence: 99%

Food security and drought

Parry

Lea

2009

Annals of Applied Biology

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Automatic controller to water plants

Médici

Rocha

Carvalho

et al. 2010

Sci. agric. (Piracicaba, Braz.)

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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 water tension to start the irrigation, since the lower is the pressostate the higher is the water column above it and, therefore, the higher is the tension inside the ceramic cup to pull up the water column. The controller was evaluated in the control of drip irrigation for small containers filled with commercial organic substrate or soil. Linear regressions explained the relationship between the position of pressostate and the maximum water tension in the commercial substrate (p < 0.0054) and soil (p < 0.0001). Among the positions of the pressostate from 0.30 to 0.90 m below the sensor, the water tension changed from 1 to 8 kPa for commercial substrate and 4 to 13 kPa for the soil. This simple controller can be useful to grow plants, applying water automatically in function of the water tension of the plant substrate. Key words: irrigation, water tension, automation, low cost Acionador automático para irrigar plantas RESUMO: A despeito da enorme demanda por água na irrigação de plantas, existem poucos aparelhos para automação deste processo sendo usados na agricultura. Avaliou-se um acionador automático para irrigação, o qual pode ser confeccionado com materiais comerciais de baixo custo, pois são produzidos em larga escala. Este acionador é composto por uma cápsula cerâmica usada em filtros de água domésticos; um tubo plástico com cerca de um metro e meio de comprimento e um pressostato de máquinas de lavar roupas domésticas. A cápsula e o pressostato são conectados pelo tubo de forma que todo o espaço interno seja preenchido com água. A cápsula é o sensor do acionador e deve ser posicionada dentro do substrato das plantas. O pressostato deve ser posicionado abaixo do sensor e quanto mais baixo ele estiver, maior é a tensão da água que aciona a irrigação, pois quanto mais baixo estiver o pressostato, maior é a coluna de água acima do mesmo e, portanto, maior é a tensão na cápsula cerâmica para puxar para cima a coluna de água. O acionador foi avaliado no controle da irrigação por gotejamento em pequenos potes preenchidos com substrato orgânico comercial ou solo. Regressões lineares explicaram a relação entre a posição do pressostato e a tensão máxima no substrato comercial (p < 0,0054) e no solo (p < 0,0001). Entre as posições do pressostato de 0,30 ...

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Improving water use efficiency

Cited by 2 publications

References 14 publications

Food security and drought

Food security and drought

Automatic controller to water plants

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