Níquel, outros micronutrientes e silício e a ferrugem asiática (Phakopsora pachyrhizi) na cultura da soja (Glycine max)

• Autor(a) principal: Queiroz, Camila de Souza
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000002hs6
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/3564
• topic: Doenças da soja; Glycine max; Resistência induzida; Manejo nutricional; Nutrição mineral; Soybean diseases; Induced resistance; Nutrition management; Mineral nutrition; CIENCIAS AGRARIAS::AGRONOMIA

An alternative for managing the disease might be performing plant nutrition since mineral nutrients are directly involved in all mechanisms of the plant’ defense system as integral components of cells, membranes, enzymes and electron transport or by activation, inhibition and regulation of metabolism. In this context the study aimed at: 1- assessing the influence of soybean nutrition with micronutrients and Si in the severity of Asian soybean rust in field conditions and a greenhouse experiment; 2- evaluating the influence of soybean nutrition with different doses and ways of Ni application in the severity of Asian soybean rust in greenhouse conditions; 3- assessing fungal toxicity of the nickel sulfate for P. pachyrhizi spores in laboratory conditions. Results showed rust severity reduction in treatments with foliar application of Zn, Si and Ni, which promoted a reduction in the rate of the disease progression in the field. The grain yield was not affected by nutrition in the field; however, the treatments with Zn applications increased grain production in the greenhouse. On the other hand, the treatments with Si application reduced the disease severity although there was a grain yield reduction in the greenhouse. The Ni promoted a lower rust severity and there was an increase in the grain yield in treatments with applications of doses 20 to 40 g ha-1. Nevertheless, the rate of the progression of the disease was not reduced in the treatments with Ni. The treatments with fungicide reduced the severity of the disease, but the grain yield did not increase. In laboratory conditions the nickel sulfate reduced the germination in vitro of P. pachyrhizi spores.