Sistema integrado de diagnose e recomendação (DRIS) para a cultura da soja convencional e transgênica na região sudeste de Goiás
Carregando...
Data
2013-02-21
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
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.
Descrição
Palavras-chave
Citação
SOUZA, Roberta de Freitas. Sistema integrado de diagnose e recomendação (DRIS) para a cultura da soja convencional e transgênica na região sudeste de Goiás. 2013. 119 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2013.