Efeito da compactação do solo e da vinhaça no desenvolvimento inicial e nutrição da cana-de-açúcar parasitada por nematoides

• Autor(a) principal: CORDEIRO NETO, Aluízio Tavares
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRPE
• Texto Completo: http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5560
• topic: Aproveitamento de resíduos; Densidade do solo; Macronutriente; Meloidogyne incognita; Saccharum; Residue use; Soil density; Macronutrient; CIENCIAS AGRARIAS::ENGENHARIA AGRICOLA

In the present study it was carried out two experiments. In the first one it was evaluate effects of soil compactness and Meloidogyne incognita parasitism interaction on macronutrient contents in shoots, sugarcane initial development and nematode reproduction. The experiment was carried out under greenhouse in a completely randomized design in a 2 (sugarcane varieties: RB962962 and RB863129 ) × 2 (presence and absence of nematode) × 3 (soil density: 1.5, 1.6 and 1.7 g.cm-3) factorial arrangement. Fifteen days after planting seedlings were moved to vases and inoculated with approximately 5 M. incognita eggs per cm3 of soil (78000 eggs per plant). After 95 days from inoculation, plants were harvest and it was evaluated plant development, N, P, K, Ca, Mg and S content in shoots and nematode reproduction. For both varieties at 1.7 g.cm-3 soil density there was reduction in plant height and weight and increase in Ca and Mg content in shoots, but there was decrease in K content of parasited plants shoots. Soil compactness increased weight and leaf area of RB962962. In the second experiment the effects of vinasse application in soil at rate of 0, 50, 100, 500 and 1000 m³.ha-1 on Meloidogyne incognita reproduction and macronutrient content of sugarcane variety RB863129 were evaluated in a completely casualised design under greenhouse. Plants were inoculated with 20000 M. incognita eggs per vase 30 days after planting, immediately after vinasse application, and results evaluated 90 days after inoculation. Nematode population density, based on number of eggs per plant and per gram of root, decreased as residue rates increased. Vinasse application significantly reduced number of M. incognita eggs per plant with maximum reduction obtained at dose of 728 m³.ha-1, but the presence of nematodes promoted significant decrease in weight of the plants. The N content in shoots was higher in the dose of 100 m³.ha-1, while for P and K, quadratic fit was reaching its maximum respectively at doses of 507 and 425 m³.ha-1. There was no difference among treatments for Ca, Mg and S.