Interferência das plantas daninhas na produtividade e na qualidade tecnológica da cana-de-açúcar no manejo cana-crua e queimada

• Ano de defesa: 2015
• Autor(a) principal: Mata, Jhansley Ferreira da [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Cana-de-açúcar; Plantas - Competição; Colheita; Produtividade agrícola; Erva daninha; Plant competition
• Link de acesso: http://hdl.handle.net/11449/135931; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/16-02-2016/000858291.pdf

The harvest system of sugarcane crops affects the weed community, specially the time and duration of weed, presence, which may affect it's development, productivity (yield) and technical quality. Based on this hypothesis, the aim of this work is to evaluate weed interfere on yield ad technical quality of sugarcane harvest with and without burning. The experiments were carried out in a randomized block design, with two treatments (burning and mechanic harvested), nine weed and weed-free periods (15, 30, 45, 60, 75, 90, 105, 120 and 145 days after sprouting), with sixteen repetitions. Weed community in each period was evaluated through to the following phytosociological indexes: relative density, relative frequency, relative dominance and Relative Importance. Based on sigmoidal regression equation, total weed free period and critical weed periods were calculated, accepting to a yield loss tolerance of 2 and 5%. Ten stems were randomly collected and sent to PCTS lab at Cerradão mill where they were analyzed for pH, brix, fiber content, purity and ATR. The handling of the species S. obtusifolia, S. latifolia and R. brasiliensis, when accomplished between 75 and 80 days after the sprouting (DAB) of the sugarcane picked without opinion poll burns or 72 and 103 DAB reduced the productivity of cultivating RB86 7615 in 5%, without consequence to the quality of the broth