A method and apparatus for near real-time in-situ soil solution measurements is presented. A first capacitor is coupled between a first differential input node and a first differential output node. Preferably, the fence is rotatably attached to the table. The first and second PADs are coupled in parallel to provide a combined substantially linear phase response. A red color filter has a film thickness to give a third light path length longer than the second light path length. Part of these composition yarns is composed of composite fiber yarns formed of heat shrinkage fiber material and heat fusion fiber material, and the heat shrinkage fiber material is shrunk by heat treatment and at the same time, the heat fusion fiber material is fused with other the composition yarns in the vicinity thereof.