Avaliação do pH e da condutividade elétrica do substrato sob níveis de fertirrigação e métodos de extração da solução.

• Autor(a) principal: Mota, Poliana Rocha D'Almeida
• Data de Publicação: 2011
• Outros Autores: Bôas, Roberto Lyra Villas [UNESP], Ludwig, Fernanda [UNESP], Fernandes, Dirceu Maximino [UNESP], Folegatti, Marcos Vinícius
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.14295/rbho.v17i2.707; http://hdl.handle.net/11449/141387
• topic: Extractor of solution; Pourthru; Nutrient management; Extrator de solução; Pourthru; Manejo de nutrientes

The present work was developed with the objective of evaluate the pH and electrical conductivity (EC) of substrate submitted to the fertigation with different concentrations and extraction method. The study was carried out in a greenhouse at Department of Natural Resources/Science of Soil, of the FCA/UNESP, of February to March of 2006. The experimental design were randomized blocks utilizing the plan factorial 5 x 2 (5 levels of electrical conductivity and 2 extraction method) with five repetitions. The levels of CE of the solution applied were: 0.5; 2.0; 3.5; 5.0 and 6.5 dS m-1, and the approaches: extractor of solution and pourthru. The experiment was conducted in potted with volume of 1.3 L, being the substrate constituted of the mixture of 30% of land of subsurface and 70% fine pine bark. The quantification of the EC and of the pH was carried out to the 9, 16, 23, 37, 44 and 51 days after the beginning of the application. The pH and EC were higher when the solution was extracted by the method pourthru due to the local extraction and the substrate physical characteristic. The pH and EC were higher when the solution was extracted by the pourthru due to the local extraction and the substrate physical characteristic. Was obtained coefficient of correlation between the two method of 0.96** to CE and 0.87** to pH. The conclusion was the use of the extractor of solution and the pourthru they can be utilized for evaluation of the pH and of the EC of the substrate, making feasible the management of the fertigation.