LYSIMETERS WITHOUT EDGE FLOW - AN IMPROVED DESIGN AND SAMPLING PROCEDURE

A description is given of a modified lysimeter design and sampling procedure designed to prevent edge flow from occurring in large soil monolith lysimeters. An internal cutting ring at the base of the lysimeter casing produced a small annular pp between the soil monolith and the wall of the casing. This pp was filled with liquefied petrolatum, which provided a water-tight seal around the edge of the lysimeter. Water and solutes were unable to leak between the monolith and casing. The use of petrolatum as a sealant is suitable for water-flux and nutrient-leaching studies, but is not suitable for pesticide studies.