TY - RPRT TI - A System for Managing Replenishment of a Nutrient Solution Using an Electrical Conductivity Controller AU - Davis, D. AU - Dogan, N. AU - Aglan, H. AU - Mortley, D. AU - Loretan, P. PY - 1998 UR - https://ntrs.nasa.gov/citations/20000032214 ID - 20000032214 ER -