Sampling strategies for determining residual nitrate soil levels after growing tomatoes in fertilized furrows - doi: 10.4025/actasciagron.v32i3.4239

• Autor(a) principal: Araújo, Charles de
• Data de Publicação: 2010
• Outros Autores: Fontes, Paulo Cezar Rezende, Mota, José Hortêncio, Sediyama, Carlos Sigueyuki, Coelho, Maurício Bernardes
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum. Agronomy (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4239
• topic: Lycopersicon esculentum; soil sampling; furrow fertilization; Lycopersicon esculentum; amostragem do solo; adubação por sulcos; Fitotecnia

Management of nitrogen fertilizer programs and sampling strategies to determine the levels of N-NO3 in the soil after growing tomatoes in fertilized furrows were studied. Two groups were studied, one without protection and another grown in an irrigated furrow in which a solid nitrogen fertilizer had been applied. In each plot, 10 treatments or criteria were evaluated. In each experiment, the treatments were arranged in a split-plot design, with 10 different nitrogen fertilizer conditions as the main treatment and soil sampling positions in a split-plot treatment. The sampling positions were arranged in a randomized complete block design. Soil N-NO3 levels were determined at the end of each sampling cycle. In all groups, residual soil N-NO3 levels were proportional to the amount of N applied. In fields without protection and nitrogen fertilizer applied to the furrow, the best strategy of soil sampling to determine the residual N-NO3 level was to use samples obtained from between the furrow and plants.