Navegando por Autor "Passos, R. R."

Filtrar resultados informando as primeiras letras
Agora exibindo 1 - 2 de 2
  • Imagem de Miniatura
    Item
    Estudo das relações hídricas entre o solo e plantas de café conilon
    (Embrapa Café, 2007) Dardengo, M. C. J. D.; Tatagiba, S. D.; Reis, E. F.; Pezzopane, J. E. M.; Passos, R. R.
    Objetivou-se com este trabalho estudar as relações hídricas entre o solo e as plantas do cafeeiro conilon submetidas a diferentes níveis de déficit da água disponível do solo (DH 0%, DH 33% e DH 67%).
  • Imagem de Miniatura
    Item
    Potential of coffee straw biochal as a substrate conditioner in seed lettuce and sorghum germination and vigorit
    (Instituto Internacional de Ecologia, 2023) Alixandre, R. D.; Lima, P. A. M.; Almeida, T. F. R.; Oliveira, J. S.; Pereira, M. B.; Alixandre, F. T.; Jacomino, G. R. L.; Dias, R. S.; Alexandre, R. S.; Ferreira, A.; Passos, R. R.; Lopes, J. C.
    The use of residues from coffee production to obtain biochar is a sustainable approach, which aims to minimize the environmental impact of these materials. In this study, the effect of adding coffee straw biochar on the physiological quality of lettuce and sorghum seeds was investigated. Thus, the objective of this work was to study the effect of adding different concentrations of coffee biochar in the substrate composition on the physiological quality of lettuce (Lactuca sativa) and sorghum (Sorghum bicolor) seeds. The experimental design used was completely randomized, with five concentrations of biochar (0; 7.5; 15; 30 and 60%), conducted with four replications of 25 seeds. The use of biochar in the concentrations studied does not provide an increase in the average germination percentage and vigor of lettuce and sorghum seeds. The increase in the concentration of biochar caused less seed vigor, suggesting a toxic effect. For seed germination, there was no significant difference between lettuce and sorghum species, regardless of treatment. For the germination speed index, sorghum seeds have higher means, except for the treatment with the addition of 15% coffee straw biochar. Lettuce seeds have higher shoot length averages, except for treatment with 100% commercial substrate. The sorghum seeds have higher mean root length and dry mass than lettuce, regardless of the treatment