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Title: Indaziflam adsorption in soils amended with olive cake and olive cake biochar: Effect of dose and temperature

item CABRERA, ALEGRIA - University Of Sevilla
item GAMIZ, BEATRIZ - University Of Sevilla
item COX, LUCIA - University Of Sevilla
item CELIS, RAFAEL - University Of Sevilla
item Spokas, Kurt
item Koskinen, William
item CORNEJO, JUAN - University Of Sevilla

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 9/6/2012
Publication Date: 9/6/2012
Citation: Cabrera, A., Gamiz, B., Cox, L., Celis, R., Spokas, K.A., Koskinen, W.C., Cornejo, J. 2012. Indaziflam adsorption in soils amended with olive cake and olive cake biochar: Effect of dose and temperature [abstract]. Proceedings of The V Iberian Congress of Soil Science Conference, September 6-10, 2012, Angra do Heroism (Terceira Island), Azores. #37.

Interpretive Summary:

Technical Abstract: Indaziflam has been approved by the USEPA for weed control in residential and commercial areas, golf courses, and nurseries. Recently, the use has been expanded to citrus, walnuts and olives, among other crops. According to the USEPA, indaziflam is a herbicide that can be mobile in soils, leaching and runoff can contaminate ground and surface waters. The aim of this study was to determine whether the addition of a residue of olive cake or a biochar prepared from olive cake, could increase the adsorption and reduce the mobility of indaziflam in two soils (a sandy loam and a clay loam). We also studied the effect of dose and production temperature of the biochar in the adsorption-desorption of the herbicide in the amended soils. The olive cake amendment in sandy loam soil at 2 and 10% (w / w) resulted in 3 and 6 times, respectively higher sorption coefficients. However, no significant differences in the sorption of the herbicide on the clay loam soil applying these same doses of olive cake residues. We did observe a significant increase in sorption when both soils were amended with the olive cake biochars obtained at higher temperatures (550 and 700 ° C) increasing the value of Kd from 1.2 to 48 L kg-1 in the sandy loam and 14 to 106 L kg-1 in the clay loam. This increase in sorption was correlated to the increase in surface areas of 17 m2 g -1 in the case of the olive cake residue, and to 27 and 60 m2 g-1 in the biochars prepared at 550 and 700 ° C, respectively. Studies observed hysteresis in the desorption, with increasing irreversibility of the sorption process with rates of amendment application. Amending the soils with the biochars created from the olive mill waste at the higher temperatures increases the sorption of indaziflam and in all cases increasing the irreversibility of the desorption. Therefore, this biochar amendment could result in decreased mobility of the herbicide and increased persistence with infiltration events.