Abstract
A method is described for supplying small and large greenhouse pots continuously and automatically with water while maintaining different soil water potentials. This system consists of diaphragm cells which are vertically inserted into the soil, storage water bottles, regulating manometers, electronic control equipment and a vacuum pump. This method has proved satisfactory for pot-grown sugar beet in greenhouses and in the field until the soil water potential (Ψ) reached −0.60 bar. A more even distribution of soil moisture was found than by other known methods. It was shown that on loamy soil the method is suitable for investigating the relationship between soil physical properties, water consumption and plant growth.
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