Autoria: ANDRADE NETO, T. M. de; COELHO, E. F.; SANTANA, J. A. do V.; SANTANA JUNIOR, E. B.; ALVES, M. da S.

Resumo: The use of fertirrigation provides larger fertilizer application efficiency, reduction on labor and increases in the benefit-cost relationship to farmers. The inadequate use of fertilizer in fertirrigation by application of concentrated injection solutions may raise salt concentration in the soil solution increasing osmotic tension, reducing total soil potential, besides affecting ionic equilibrium in the soil solution. The work had as objective to evaluate three concentrations of urea and calcium nitrate in irrigation water on nitrate concentration in soil solution at two soil depths, considering banana crop grown in Yellow Latossol of coastal tableland. Treatments regarded about using of three calcium nitrate and urea concentrations (1.0; 2.5 and 4.0 g/l) in the irrigation water that was applied in the field by a drip irrigation system during the first cycle of banana crop. Samples of soil solution were collected every 15 days in each plot by water samplers that were installed at 0.30 m from the plant at depths of 0.20 and 0.40 m between two emitters. Nitrate concentration in soil solution increased with the increase of nitrogen source concentration in irrigation water. Mean nitrate concentration of soil solution for 4 gL-¹ concentration of irrigation water was the largest one of both sources and soil depths.

Ano de publicação: 2008

Tipo de publicação: Artigo em anais e proceedings

Unidade: Embrapa Mandioca e Fruticultura

Palavras-chave: Irrigation water concentration, Sources of nitrogen