TITLE:
Allelopathic Effect of the Coffee Residue in Emergency and Urochloa brizantha Growth
AUTHORS:
Bruno Manoel Rezende de Melo, Tácio Peres da Silva, Douglas Goulart Castro, Flávia Barbosa Silva Botelho, Emily Renata Moreira, Suelen Simão Gomes, Heloisa Oliveira dos Santos
KEYWORDS:
Caffeine, Organic Waste, Phytotoxicity
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.4,
March
12,
2018
ABSTRACT: Weed management is important for the increase of
agricultural crops, since they have a negative influence on yield and harvest
quality. To optimize the management it is possible to use the coffee infusion
residues, which has caffeine
contents, a substance that has an allelopathic effect to some plants. Thus, the
goal was to evaluate the allelopathic effect of coffee residues in the
emergence and growth of Urochloa brizantha under
product doses, gathering and application seasons in pre- and post-emergence. The experiment was carried out at UFLA, in a greenhouse with
potting, with Urochloa brizantha seeds, cultivar Piata, in DBC with three replicates
in the factorial (3 × 4 × 2): time of gathering (A, B, C); concentration of ground (0, 20, 50 and
100 (% W/V)) and pre- and
post-emergence application. The height, fresh and dry weight, Emergence Speed
Index—ESI and phytotoxicity were evaluated. It was verified the significance
for pre-emergence treatments, reducing plant height, increasing phytotoxicity
and reducing fresh weight. For the ESI, it was identified that only for
gathering season obtained a significant result. In the phytotoxicity
evaluations, it obtained interaction for the season of application with residue gathering season. For product doses and applications in pre- and post-emergence interaction was observed for phytotoxicity. It is
concluded that the residue has allelopathic effect reducing growth and
increasing phytotoxicity up to a maximum
dose of 55.83 and 86.76 for pre- and
post-emergence applications of Urochloa brizantha.