Abstract
In this research the effect of land application of manure on atrazine leaching was examined under laboratory conditions using 14C‐labelled compound. Four undisturbed and two disturbed soil columns, in replicates were used to study the effect of rate and time of manure application relative to rainfall on atrazine transport through saturated soil. Manure and atrazine were applied at a rate of 60m3/ha (6500 gal/acre) and 2.4 kg/ha, respectively. Application of manure increased the peak concentration and decreased the time to peak and mean time of elusion of atrazine in all soil columns. Atrazine mobility was faster when rainfall occurred immediately after manure application. In the disturbed soil columns, the average peak relative concentration of effluent (C/Co) without manure was 3.1% and occurred after the passage of about 2.2 pore volumes compared to C/Co of 6.9% and occurred at 1.2 pore volumes with manure. In one of the undisturbed soil columns, the peak concentration C/Co without manure was 47% and occurred after the passage of 0.07 pore volume. The corresponding C/Co in the presence of manure, when rainfall occurred immediately after manure application, was as high as 138% and occurred after only 0.03 pore volume.
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