Abstract
This paper describes the design, construction, operation, and performance of an apparatus useful for studying pesticide leaching through intact soil cores. A technique is described for rapidly mounting intact soil cores. A turntable is used to support and rotate 12 or more soil cores under an oscillating dripper unit capable of simulating rainfall intensities of 1 to 30mm/h. Each soil core is attached to a filtration flask which is connected to a -10 to -20 Kpa vacuum supply. The CV of the rainfall delivery rate over a range of 2–12mm/h averaged 3.7%. Dye studies using intact soil cores indicated that water movement at the soil-wall interface was not faster than through the soil matrix. An experiment conducted to evaluate atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)- s -triazine] leaching through soil cores obtained from no-till(NT) and conventional-till(CT) fields indicated consistently greater leaching through CT cores. The capability of precise application of simulated rain, accommodation of large number of soil cores, and ease of modification to meet a wide range of research parameters make this apparatus useful for the laboratory evaluation of soil-water-pesticide interactions.
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