Enriquecimento de sementes de feijão com molibdênio e seus efeitos na qualidade fisiológica de sementes e na produtividade em três gerações de plantio

• Autor(a) principal: Lima, Tricia Costa
• Data de Publicação: 2009
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1126
• topic: Phaseolus vulgaris; Molibdênio; Sementes; Phaseolus vulgaris; Molybdenum; Seeds; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

The objective was to evaluate the effects of molybdenum rates on the common bean seed physiological quality and yield in three planting generations. Two cultivars were used: Ouro Vermelho and Ouro Branco. Four experiments were conducted for each cultivar at the Experimental Station of Federal University of Viçosa, in the municipality of Coimbra, state of Minas Gerais (latitude of 20º50'30" S, longitude of 42º48'30" W and altitude of 715 meters). The experiments were conducted in a randomized block design with four replications. With the cultivar Ouro Vermelho, the first experiment was conducted during the spring-summer (rainy season) 2005; the second experiment was conducted in the summer-autumn (dry season) 2006; the third in the winter season, 2006; and the fourth experiment in summer-autumn (dry season), 2007. With the Ouro Branco cultivar, the first experiment was conducted during the winter, 2006; the second experiment was conducted in summer-autumn (dry season), 2007; the third in the winter, 2007; and the fourth experiment in summer-autumn (dry season), 2008. In the first experiment of each cultivar seven molybdenum rates of 0, 75, 150, 300, 600, 1200 and 2400 g ha-1 were sprayed. The rates of 0, 75, 150 and 300 were sprayed once at 15 DAE and the rates of 600, 1200, and 2400 were split by 30 DAE. The source of Mo was sodium molybdate that was sprayed on the leaves to obtain enriched seeds (SE). In the following three experiments (1st generation, 2nd generation and 3rd generation) seeds collected in the previous experiments were used. In the cultivar Ouro Vermelho, Mo concentration in leaves and seeds increased until the rate of 1700 g ha-1 of Mo sprayed on plants. Also, contente of Mo in seed increased by 1700 g ha-1 of Mo. This happened at both in the seed generation enriched and 1st generation. Physiological quality of seed improved as Mo rates increased at enriched seeds, seeds of the 1st and 2nd generation, but not at 3rd generation. For the Ouro Branco, rates until 350 g Mo ha-1 increased Mo content of the seed enriched (SE) and the seed obtained from the 1st generation. However, there was no effect on yield in any generation. Mo improved physiological quality of seeds enriched, in the 1st generation and 2nd generation. It was concluded that enriched seeds can provided Mo to plants just for one generation.