For any reuse of drainage water accumulation of sodium and chloride is a major bottleneck to achieve 0-emission. Blowdown is therefore sometimes unavoidable.
The most effective way of flushing is with the highest load of sodium and lowest of nutrients and pesticides. On this subject a number of theories exists, which have to be tested in practice.
The aim of this project is to update the database with important parameters that determine Na (and Cl) accumulation of crops: the concentration of Na uptake and the Na-damage threshold. Also drainage strategies to get an effective reduction of Na with a minimal discharge of N and P are tested.