Efeitos da dessecação pré-colheita nas características agronômicas e qualidade de sementes de soja de tipos de crescimento determinado e indeterminado

• Ano de defesa: 2013
• Autor(a) principal: Bezerra, André Ricardo Gomes
• Orientador(a): Sediyama, Tuneo
• Banca de defesa: Sediyama, Tocio , Matsuo, éder
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Soja - Semente - Rendimento; Soja - Semente - Qualidade
• Palavras-chave em Inglês: Soy - Seed - Income; Soy - Seed - Quality
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA
• Link de acesso: http://locus.ufv.br/handle/123456789/4630

Desiccation has the objective of control weeds and cause defoliation of the crop. It can also anticipate harvest, standardizing and reducing losses, reducing impurities, yielding grain cleaner and better quality. In addition to reducing the damage caused by the attack of fungi and pests final cycle. The objective of this work was to evaluate the effect of pre-harvest desiccation of early soybean and semi-late on anticipating cycle, production and physiological seed quality. The experiment was conducted in the agricultural year 2012/13, the experimental field of UFV (Campus Viçosa). In a randomized block design in a factorial 2 x 4 (two cultivars x four seasons) with four replications. We used the BRS Valiosa RR, determinate growth and MSoy 7211 RR, indeterminate growth. The drying was carried out in stages R5.7, R6.5, R7.3, and a control with harvesting R80. Desiccation was performed with the herbicide paraquat in a dose of 2.0 L h-1 Commercial Product. Were evaluated number of days to harvest after dissection (NDPC), cycle duration in days, water content in the seeds (TA), yield in kg ha-1, 100 seed weight (P100), oil content, protein, proportion of seeds per sieve (6, 5.5, 5 and 4mm), green seed, deformed and normal percentage. Following tests were performed first count germination, germination, root length and aerial part, germination after accelerated aging, speed of emergence, emergence in sand, dry weight of shoot and root. There was a significant interaction (p <0.05) between cultivar x desiccation time for the NDPC, cycle, P100, oil content in the seed and germination. About the main factors, only 5.5 mm sieve fraction was not significant. The dissection in early stages R5.7 and R6.5 reduced productivity and P100. R5.7 promoted average reduction of 27% in productivity. The desiccation in R5.7 promoted average reduction of 27% in productivity. It was possible to anticipate the harvest cultivate MSoy 7211 RR up to 11 days without yield losses, unlike the BRS Valiosa RR, whose cycle reduction caused a productivity reduction. For the seed oil content was observed before the desiccation R5.7 reduced its content in 8 and 2% for the cultivars MSoy 7211 RR and BRS Valiosa RR, respectively, when compared harvesting in R8.0 stage. Germination, however, was not affected. Desiccation from R7.3 did not reduce the production, vigor and germination of both cultivars.