Allelopathic potential of corn hybrid on initial development of coffee seedlings (Coffea arabica L.) / Potencial alelÃpatico de hÃbridos de milho no desenvolvimento inicial de cafeeiros (Coffea arabica L.)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Corn seedlings transplanted to old cornfields have experienced development inhibition. Laboratory and greenhouse bioassays were established at Lavras Federal University to determine allelopathic potential of corn hybrids on coffee seedlings initial growth. Aqueous extracts at 5% (w/v) concentration of above ground corn hybrids P 30K75, GNZ 2005, GNZ 2004, DKB 350, P 30F90, SHS 4080, AG 7000 and AG 8060 were applied on lettuce seeds (cv. Regina of Summer) as plant tests planted to Petri dishes. In the second bioassay, it was used aqueous extracts of the hybrid GNZ 2004, GNZ 2005, P 30K75 and DKB 350, at concentrations of 2,5; 5,0 and 10,0% w/v. In greenhouse, four coffee cultivars were transplanted to pots filled with soil mixed with corn straws. Aqueous extracts of corn hybrids inhibited germination index and radicle and hypocotile lengths of lettuce plants. GNZ 2005 and P30K75 were more inhibitory than GNZ 2004 and DKB 350. Coffee chlorophyll content and stem dry weight of Catuaà coffee cultivar were reduced by GNZ 2005 straw mixed in the soil while Topazio were promoted by GNZ 2004. Straws of GNZ 2004 corn cultivar incorporated into the soil increased roots dry weight of coffee seedlings at 90 day after transplanting.

ASSUNTO(S)

corn milho fitotecnia cafà allelopathic alelopatia coffee

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