The soil cover for vegetables impedes the light passage and reduces the thermal width, hindering the processes of seeds dormence break of several weeds species, being able to, also, to work as a mechanical barrier to the emergency of the plantules. Chemically, through the allelopathia the vegetable cover can liberate substances that impede or reduce the germination and the development of the weeds. The objective of this work will be verify allelopathical and physical effects of green manure on the weed suppression. The experiments will be performed at the Centro de Ciências Agrárias/UFSCar, Araras/SP. The experimental will be completely randomized design in the 2x5x2 factorial scheme being evaluated the effects of two amounts of green mass of the species Crotalaria juncea, Canavalia ensiformis, Mucuna aterrima, Avena strigosa, and Pennisetum glaucum, two incorporation depths (surface and incorporate to 5 cm)in the emergency of the species Euphorbia heterophylla, Ipomoea grandifolia and Brachiaria decumbens. The evaluations will be made until the 30 days after sowing, being observed weed emergence and biomass dry. In the second experiment, will be evaluated in field, the seed bank and the emerging flora of weeds in areas cultivated with manures green Crotalaria juncea, Canavalia ensiformis, Mucuna aterrima, Avena strigosa, and Pennisetum glaucum during 2007-2008.
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