Influência alelopática das coberturas mortas de casca de café (Coffea arabica L.) e casca de arroz (Oryza sativa L.) sobre o controle do caruru-de-mancha (Amaranthus viridis L.) em lavoura de café

Abstract

Mulching coffee plantation is empirically used as weed suppression method. The knowledge of the allelopathic potential of these cropresidues enable its use in a more rational way as member of the integrated management system. This research aimed at testing coffee and rice husks effects upon slender amaranth (Amaranthus viridis L.) in coffee, var. “Catuaí” plantation in Lavras, MG, Brazil. The experimental design was a randomized block with four replications in a split plot scheme, considering mulch incorporation in the soil and no incorporation as main plots, and coffee and rice husks, and expanded vermiculite and no mulch as subplots. Coffee and rice husks either inhibited seed germination or stimulated growth of slender amaranth in different ways: rice husk promoted greater seed germination inhibition than coffee husk, while coffee husk promoted greater growth stimulation than rice husk. Incorporated husks provided higher coffee grain yield than not incorporated.