MUGNI Hernan Diego
Toxicity Persistence of Chlorpyrifos in Runoff from Experimental Soybean Plots to the Non-target Amphipod Hyalella curvispina: Effect of Crop Management
MUGNI, H.; PARACAMPO, A.; DEMETRIO, P.; PARDI, M.; BULUS, G.; RONCO, A.; BONETTO, C.
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Lugar: Berlin; Año: 2016 vol. 70 p. 257 - 257
Toxicity persistence to the nontarget amphipodHyalella curvispina in runoff events following chlorpyrifos applications to soy experimental plots was compared inconventional and no-till management. Two applicationscenarios were compared: an early-season application withthe soil almost bare and a late-season application after thefoliage had attained complete soil cover. H. curvispina wasexposed to chlorpyrifos using two different test systems: ashort-term (48 h) runoff water exposure and a long-term(10 days) soil exposure. Both commonly used crop managementpractices for soybean production resulted in runofftoxicity following pesticide applications and represent atoxicity risk for adjacent inland waters. Toxicity persistencewas longer after the earlier than the late seasonapplication, likely because of higher volatilization andphotodecomposition losses from the soy canopy than fromthe soil. For the early-season application, toxicity persistedlonger in the no-till plots than in the conventional tillage plots. Suspended matter was higher in the conventionaltreatment. Chlorpyrifos sorption to suspended matter likelycontributed to the shorter persistence. For the late-seasonapplication, toxicity persisted longer in the conventionaltreatment. The causes remain conjectural. The soil organiccarbon content was higher in the no-till treatment. Sorptionto organic matter might have contributed to the shorterchlorpyrifos toxicity persistence in no-till management.Late applications are more frequent and prevail longerthroughout the soy growing season. Overall, the no-tillmanagement practice seems preferably because shortertoxicity persistence in runoff represents a lower environmentalrisk for the adjacent inland waters.