The Uptake of Phosphate by Plants from Flowing Nutrient Solution

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Abstract
An existing system of flowing solution culture in which pH and the concentration of several nutrient ions in solution are automatically monitored and controlled has been extended to include the monitoring and control of orthophosphate in the range 0.0013 to 0.3 mg P l−1 (4.2 × 10−8−10−5 M). Continuous-flow colorimetry is used for the analysis of phosphate and a computer is employed to hold concentrations constant by the operation of nutrient pumps. A brief account is given of the performance of the system with perennial ryegrass (Lolium perenne L.) as the experimental plant.