Influence of electric conductivity management on greenhouse tomato yield and fruit quality

Summary

This review synthesises evidence on how manipulating electrical conductivity in hydroponic nutrient solutions can be used to balance tomato yield and fruit quality in greenhouse systems. The authors demonstrate a trade-off: whilst increasing EC above 2.3–5.1 mS·cm⁻¹ reduces marketable yield and fruit size, EC levels of 3.5–9.0 mS·cm⁻¹ improve sensory and compositional quality attributes such as sweetness and dry matter. The authors emphasise that optimisation requires careful management of nutrient ratios, cultivar selection, and climate control to mitigate yield penalties and physiological disorders.

Regional applicability

The findings are directly applicable to UK protected horticulture, particularly glasshouse tomato production systems which commonly use soilless culture. UK growers can apply these EC management principles to balance yield and quality in commercial production, though cultivar response and specific environmental interactions will depend on local growing conditions and market preferences for fruit size versus flavour intensity.

Key measures

Electrical conductivity (mS·cm⁻¹), marketable yield, fruit size, dry matter content, sugar:acid ratio, titratable acids, potassium, nitrogen, sodium content, blossom-end rot incidence, light intensity, humidity, temperature, ambient CO₂ levels

Outcomes reported

The study examined how electrical conductivity (salinity) of nutrient solutions influences tomato marketable yield, fruit size, dry matter content, and quality attributes including sugar:acid ratio, titratable acidity, and mineral composition. It also explored interactions between EC management and climatic factors, environmental controls, and cultural practices.

Topic tags