Sistema integrado de diagnose e recomendação (DRIS) para a cultura da soja convencional e transgênica na região sudeste de Goiás

• Autor(a) principal: Souza, Roberta de Freitas
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/3738
• topic: Estado nutricional; Normas DRIS; Índices DRIS; Faixas de suficiência; Nutritional status; DRIS norms; DRIS indices; Sufficiency ranges; CIENCIAS AGRARIAS::AGRONOMIA

The Integrated System for Diagnosis and Recommendation (DRIS) has proven its effectiveness as a method for determining nutritional status of crops. The objective of this study was to establish norms in areas of conventional and transgenic soybean in southeastern counties of the state of Goiás to create a database that will allow the use of DRIS in the region. In addition, to diagnose most of the nutritional limiting factors for the obtainment of high yields in soybeans by leaf analysis, performed by the methods of Concentration Ranges and DRIS. Areas of commercial soybeans were selected in the counties of Silvânia, Vianópolis and Luziania, GO, Brazil. In these areas, 103 sampling plots of conventional and 260 plots of transgenic soybeans were demarcated. In each plot, 10 leaves were collected, removing the third expanded trifoliate with the petiole from the tip of the main stem, at the beginning of the flowering stage to form a composite sample. After physiological maturity, production samples were collected taking a meter of plants in the rows, in five randomly selected points in each plot. Foliar analyzes were interpreted by the methods of Concentration Ranges and DRIS. Norms for conventional and transgenic soybean were established from a reference population with yield higher than 3,500 kg ha-1 of soybeans to calculate DRIS indices. The methods of diagnosis used in this work had in common the nutrient N as the most limiting factor for conventional and transgenic soybeans. Nutrients N, Cu and Zn were considered the most limiting factors for the two types of soybeans by the Method of Concentration Ranges. The DRIS method diagnosed nutrients N and P as the most limiting factors for the two types of soybeans and showed higher sensitivity for diagnosing nutritional problems, especially for micronutrients.