Summary
This field study investigated the use of continuous stem diameter measurement via laser sensor as a non-destructive method to assess plant water stress in hydroponic tomato cultivation. Relative stem diameter (RSD)—expressed as a percentage of maximum stem diameter—showed strong linear relationships with leaf photosynthetic rate and leaf water content across the growing period, though temporal variation and harvest timing required consideration. The findings suggest RSD is a practical, real-time indicator for automated irrigation control systems in restricted root-zone hydroponics aimed at optimising fruit quality.
Regional applicability
This controlled-environment hydroponics study is not geographically specific to United Kingdom conditions but the methodology is potentially transferable to UK protected cropping systems. Adoption would require validation under UK greenhouse conditions and integration with existing irrigation infrastructure, though the approach aligns with UK horticultural interest in water-efficient, high-value crops.
Key measures
Relative stem diameter (RSD), stem diameter (SD), maximum stem diameter (MSD), leaf photosynthetic rate (Pr), relative water content (RWC) of leaves
Outcomes reported
The study validated relative stem diameter (RSD) measured by laser sensor as a non-destructive indicator of plant water stress in tomato hydroponics. RSD showed strong linear correlation with leaf photosynthetic rate and relative water content, demonstrating its utility for automated irrigation scheduling.
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