ALLELOPATHIC ACTIVITY OF COVER CROPS EXTRACTS ON SOYBEAN, CUCUMBER AND LETTUCE

作者：Ditzel Nunes Joseli Viviane; de Melo Dirceu^*; Pereira Nobrega Lucia Helena; Pacheco Loures Neoraldo Thadeu; Farina Sosa David Esteban

来源：Revista Caatinga, 2014, 27(1): 122-130.

• Allelopathy
• Cover crop
• Aqueous extracts

Allelopathy can be defined as any effect, direct or indirect, beneficial or harmful, a plant on the other, through the release of chemical compounds into the environment. Thus, this study aimed at evaluating, in the laboratory, allelopathic effects of aqueous extracts from cover crops as canola (Brassica napus L. var), crambe (Crambe abyssinica Hochst), sunn hemp (Crotalaria juncea), linseed (Linum usitatissimum L.) and forage turnip (Raphanus sativus L.) at 0, 12.5, 25, 50 and 100% concentrations. The plants used in aqueous extracts were collected during their flowering period of each studied species. Germination tests were performed on seeds gerbox, fresh and dry seedlings biomass, root and shoots seedlings length. The experimental design was completely randomized (CRD) in factorial (5x5) with four replicates per treatment. According to these results, it can be concluded that the tested extracts showed allelopathic effect on seedlings of lettuce, cucumber and soybean on almost all parameters, but for soybean germination and dry mass percentage, this effect was not significant. The sunn hemp extract, despite concentration, contributed the most to increased germination and seedling growth. However, linseed extract showed opposite effect for these parameters in 100% concentrations.

• 出版日期2014