DIURNAL FLUCTUATION IN ROOT PRESSURE

Abstract
Plants were grown in soln. culture in a greenhouse and measurements of root pressure made with small bore (1 mm.) U-tube manometers. 3 exps. are presented showing some relations between root pressure, respiration and soln. conc, under constant conditions of temp. and light. (Exps. did not show a correlation between respiration and the diurnal fluctuation of root pressure.) There is evidently some force other than ,osmotic pressure involved in root pressure.