Abstract

A portable 1 H NMR spectrometer has been applied to whole plants in situ, i.e. in climate rooms and in a greenhouse, to study plant water relations under these conditions. The spectrometer consists of a 30 kg permanent magnet system of 0.235 T, modified Bruker Minispec electronics, and a standard XT pc for spectrometer control. Unattended, the system automatically measures the xylem sap stream and tissue water content in a well-defined section of the plant stem. Because of the small size of the magnet these measurements can be made at different positions on the plant stem or on different plants in succession. Magnetic field drift due to the varying climates that occur in greenhouses was corrected by field locking

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