Summary
This hydroponic study examined salt application timing and concentration strategies to optimise tomato fruit quality (sugar content) without excessive yield penalty. By applying salt (2000 ppm) early then switching to standard nutrient solution at flowering stage, growers achieved target Brix levels (8.5–9.7) with less fruit weight loss than continuous salt treatment. In higher-density cultivation with elevated nitrogen and higher EC (6 dS·m⁻¹), salt amendment enabled early achievement of target sugar levels whilst limiting weight reduction in upper fruit clusters.
Regional applicability
The findings are relevant to United Kingdom horticultural practice, particularly for protected tomato production systems using hydroponics or similar intensive methods. However, direct application may require adaptation for UK growing seasons, cultivar choices, and market sugar preferences; the research is specific to Japanese growing conditions and cultivar responses.
Key measures
Total soluble solids (Brix), fruit weight, electrical conductivity (EC) of nutrient solution, nitrogen concentration
Outcomes reported
The study investigated how artificial sea salt addition to nutrient solution affected fruit sugar content (Brix) and weight in hydroponically grown tomatoes. Results showed that early salt application increased sugar content but reduced fruit weight, whilst staged salt reduction during flowering preserved both target sugar levels and fruit weight.
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