Influência das cascas de café (Coffea arabica L.) e de arroz (Oryza sativa L.) sobre a germinação e crescimento do caruru-de-mancha (Amaranthus viridis L.)

Abstract

Allelopathy may constitute an alternative method for weed control in coffee, as part of the integrated management system. The knowledge of the allelopathic potential of a living plant or residues is necessary for its efficient utilization.This research aimed to determinate the effects of coffee and rice husks on germination and growth of slender amaranth (Amaranthus viridis) infesting coffee trees under field and green house conditions. Under field conditions coffee and rice husks,expanded vermiculite and no mulch treatments were applied inter rows with and with out incorporation in me soil. In greenhouse one experiment was constituted by the same mulch's as in the field with three arrangements modes in the pots soil layers: placed on the top, incorporated in the soil surface and incorporated in the bottom. A second experiment was established to test coffee and rice husks aqueous extracts at 0, 5, 10, 15 and 20% concentrations on slender amaranth germination and initial growth into coffee crop and common steep bank soils. Rice husk promoted greater germination inhibition than coffee husk, while the latter promoted greater plant development than rice husk.