Incrustamento em sementes de azevém anual(Lolium multiflorum lam.): características físicas e qualidade fisiológica

• Ano de defesa: 2010
• Autor(a) principal: Peres, Wilner Brod
• Orientador(a): Baudet, Leopoldo
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Pelotas
• Programa de Pós-Graduação: Programa de Pós-Graduação em Ciência e Tecnologia de Sementes
• Departamento: Faculdade de Agronomia Eliseu Maciel
• País: BR
• Palavras-chave em Português: Tratamento; Recobrimento; Polímero; Plantabilidade
• Palavras-chave em Inglês: Treating; Coating; Polymer; Sowing capacity
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::PRODUCAO E BENEFICIAMENTO DE SEMENTES
• Link de acesso: https://guaiaca.ufpel.edu.br/handle/123456789/1526

The objective of the present research was to increase ryegrass seed weight thought addition of inert materials by the process of incrusting (seed weight increase without change its form), to reduce drifting and to uniform its distribution improving it ballistic power when sowed by airplane. Two seed lots were used harvested in 2007/2008. After air separation to remove light materials and impurities, seeds were screened through two oblong holes screens: 1,2 x 20 mm and 0,8 x 12 mm, being used seeds over the 0,8 x 12 mm screen. Seeds were treated with insecticide Standak®, fungicide Vitavax® - Thiram 200 SC and Giberellic acid ProGibb® (10%). Inert materials used were Vermiculite and natural Phosphate of ARAD grinded and passed by nº 100 screen. Adhesive materials were used Rigrantec polymers Polyseed 70® and Polyseed CF® diluted in water in proportion of 1:1. Those materials were added to the seeds in four individual layers including a drying period among each layer. The physical characteristics of seeds were determined by 1000 seeds weight, test weight, repose angle and terminal velocity. The physiological quality of the seeds was evaluated by the following tests: standard germination, first count of germination, accelerated ageing, speed of emergence, emergence speed index, aerial part length, root length and dry matter weight. Seed moisture content was also determined before and after the accelerated ageing test. Results allowed the following conclusions: Incrusting ryegrass seeds increase seed weight in 6.1 times, improving airplane sowing conditions. Physical characteristics of incrusted ryegrass seeds are favorable to airplane sowing due to improve repose angle, test weight and terminal velocity of seeds. Physiological quality of ryegrass seeds is not affected by the incrusting technique using adhesive materials, polymer, fungicide, insecticide and Gyberellic Acid. Ryegrass seedling performance is improved by incrusting of seeds with adhesive materials, polymer, fungicide, insecticide and Gyberellic Acid. Incrusted seeds have better control of moisture absorption by seeds.