LP/p - Soil Capillary Pressure Laboratory Probe
LP/p is a laboratory miniprobe designed for monitoring instantaneous profiles of soil water capillary pressure (matric potential, suction force) in soil columns or in undisturbed soil cores sampled with standard sampling equipment. LP/p is pushed into the soil core and fixed with a clamp nut. Several LP/p probes can be inserted through the wall of a soil column or a steel sampling cylinder, thus allowing for vertical scanning of the instantaneous water potential profiles. Such an array, when combined with similarly installed miniprobes for soil moisture (LP/ms probes), enables collecting a set of corresponding water content and matric potential data from drying or wetting front transition. From the collected data set, after further processing, one can obtain a complete set of the unsaturated water flow characteristics of the soil, that is: water retention (PF-curve), unsaturated water conductivity (k-function), differential water capacity and unsaturated water diffusivity.