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LEITE, Ricardo Figueiredo Cavalheiro (2008)
Publisher: Universidade Federal de Pelotas
Languages: Portuguese
Types: Master thesis
Subjects: oryza sativa, micronutrientes, rendimento de grãos, qualidade da semente, micronutrient, grain yield, seed quality, :CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::PRODUCAO E BENEFICIAMENTO DE SEMENTES [CNPQ]
O boro é um nutriente essencial para as plantas. Suas funções estão envolvidas com o crescimento celular e o desenvolvimento da flor. Na floração, a deficiência do micronutriente reduz a macho-fertilidade em função do prejuízo à microesporogênese e ao crescimento do tubo polínico. Neste trabalho, objetivou-se definir as fases de maior sensibilidade da cultura, com o intuito de identificar épocas apropriadas para a aplicação de tratamentos corretivos de boro. A aplicação do boro, na forma de borato de sódio (Na2B4O7.10H2O), na dosagem de 10 kg.ha, foi realizada em cinco épocas diferentes (na base; no perfilhamento; na diferenciação do primórdio floral; no emborrachamento; e na floração plena). Foram realizadas avaliações sobre o rendimento, esterilidade e componentes de rendimento do arroz, bem como sobre a qualidade fisiológica das sementes produzidas. O trabalho pode constatar que a quantidade aplicada de borato de sódio não é prejudicial à cultura do arroz irrigado, embora não haja efeito da aplicação do nutriente em diferentes épocas do cultivo. Boron is an essential plant nutrient. Its functions are related to cellular growth and flower development. At flowering, the micronutrient deficiency reduces male-fertility due to damage to microsporogenesis and to the pollen tube growth. This work aims to define the phases of higher sensibility of the culture, with the purpose of identifying appropriate times for applying of boron to the rice crop. Boron application, in form of sodium borate (Na2B4O7.10H2O), in dosage of 10 kg.ha, was made in five different phases: base fertilization; tillering; primary flower differentiation; booting stage; and full flowering. Evaluation on yield, sterility and rice yield components, as well as physiological quality of the seeds produced have been done. The results allowed the verification that the amount of sodium borate applied is not harmful to the flooded rice crop, and there are no effects of application of the nutrient in different times of cultivation.
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