Abstract
More than three times the yield can be obtained from crops such as tomatoes grown by the nutrient film technique. In this technique a thin film of nutrient solution is trickled over the roots of the growing plants. The automated nutrient film analyser (ANFA) has been developed to analyse the film for nutrients such as NO − 3 and K +, to monitor the build-up of unwanted ions such as Cl − and Na +, and to measure pH. The electrodes and microcomputer instrumentation are described. New electrochemical sensors are needed. A total iron determination using the packed bed wall-jet electrode has been developed. Total organics in the film can be estimated from a bromine microtitration performed on a wall-jet ring-disc electrode, and an amperometric method for the measurement of NO − 3 is described.
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