Efeito alelopático de diferentes plantas utilizadas como cobertura vegetal sobre o sorgo ( Sorghum bicolor)

Abstract

The release of composite, in soil or atmosphere, by species used as vegetable cover in agricultural systems, may interfere in germination, development and productivity of growing, as beneficially as harmfully, featuring the phenomenon of allelopathy. Based on that, the growth of sorghum was evaluated in the present study, verifying length and biomass, fresh and dry, of roots and air part after cultivation in vases with or without vegetable cover of millet (Pennisetum glaucum), oat (Avena strigosa) and brachiaria (Brachiaria ruziziensis). The vases were kept for 47 days in vegetation house, in the experimental farm/ BIOTEC – UNICESUMAR, in Maringa. The experimental design was completely randomized, with four treatments and five repetitions. The data were evaluated by analysis of variance and the average among treatments compared by Scott Knott test with 5% of significance. It was observed that among the covers that were used, the Avena strigose and Brachiaria ruziziensis highlighted themselves with positive allelopathic effect over length of the root and air part of sorghum. However, the cover of millet has not altered the growth of sorghum.