PHENOLICS ADSORPTION TO SOIL REDUCES THEIR ALLELOCHEMICAL ACTIVITY
| Autor: | RIBAS A. VIDAL, MICHAEL V. HICKMAN, THOMAS T. BAUMAN |
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| Jazyk: | portugalština |
| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Pesquisa Agropecuária Gaúcha, Vol 4, Iss 2, Pp 125-129 (1998) |
| Druh dokumentu: | article |
| ISSN: | 0104-9070 2595-7686 |
| Popis: | Allelopathy could be used to reduce weed infestations, but adsorption of afielochemicals to soil can reduceits effects in agro-ecosystems. The objectives of this work were to study the effect of caffeic, ferulic, and salicilic acids, andcatechol on Selaria faberi (SETFA) germination in Petri-dish and soil bioassays, and to determine the adsorption of thesephenolic compounds to a silt clay loam soil. Petri-dish experimenta, using SETFA as the indicator species, showed that theallelopathic potential of the phenolics tested was: iferulic acid > catechol > salicilic acid > caffeic acid. Caffeic acid, up to 27mM, did not affect SETFA germination. SETFA germinated better in soils than in Petri-dish experimenta, suggesting thatadsorption plays an important role on the performance of the phenolic acida. Adsorption of the phenolics to soil ranged from10 to 40 % of the applied concentration. Caffeic acid and catechol had more affinity with the soil than salicilic and ferulicacids. The rate of these phenolics in 12 t/ha of wheat straw is not enough to reduce SETFA germination in the field. Theseresulta indicate that allelochemical activity may be limited by their adsorption to the soil.' |
| Databáze: | Directory of Open Access Journals |
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