Abstract
Lysimeter experiments were conducted to study the leaching of [ 14C]dichlorprop and [ 3H]water through different soil columns. Results from soil columns collected at Haslemoen showed that an upper silt loam layer (0–18 cm) had higher retention capacity than the underlying sandy loam (35–60 cm) and fine sand (70–95 cm) layers. Leaching through silt clay loam (0–18 cm) columns from Ullensaker was very fast. When the columns received an amount of water corresponding to ≈ 10 mm precipitation, up to 50% of the added [ 14C]dichlorprop leached through the columns. This is probably due to rapid downward movements through macropores (e.g. cracks).
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