Behaviour of the herbicide aminocyclopyrachlor in a loam-silty soil after amendment with biochars and alperujos

Comunicación presentada en el 17th International Symposium on Environmental Pollution and its Impact on Life in the Mediterranean Region, celebrado en Estambul del 28 de septiembre al 1 de octubre de 2013.

The aminocyclopyrachlor herbicide was aproved by the US-EPA for its use in non cultivated areas, greens and non residencial gardens. This herbicide with a pKa 4.65 presents an anionic character at the pH of most soils. The anionic compounds are weakly retained by the active soil components and hence they are easily transported to different compartments. In this context this herbicide could not be active in the target plants and be transported to ground and /or surface waters. In order to increase the retention of aminocyclopyrachlor by soils some organic amendments like “biochars” and “alperujos” from different industrial sources and prepared in different ways could be added. Lab experiment on adsorption-desorption of herbicide by amended soils were performed and compared with the corresponding unamended soils and with an active carbon amended soil. The higher herbicide sorption was observed in the soil amended with active carbon. On the other hand, the herbicide sorption only increased in soils amended with biochars originated from wood pellets. The adsorption reversibility of aminocyclopyrachlor herbicide was very low and generally inversely correlated with the adsorption capacity of amended soils.

TUBITAK.-- ÇİMSA A.Ş..-- ISTAÇ A.Ş..-- Yıldız Entegre A.Ş.-- Istanbul Technical University, TURKEY

Peer reviewed