Effect of EC Level of Irrigation Solution on Tomato Growth and Inorganic Ions of Root Zone in Soilless Culture of Tomato Plant Using Coir Substrate

Summary

This experimental study investigated how electrical conductivity (EC) of nutrient solution affects tomato growth and root zone ion dynamics in coir-based soilless culture. An EC level of 1.5 dS·m⁻¹ optimised yield and fruit quality across six harvests, whilst higher EC levels (2.0 and 3.0 dS·m⁻¹) resulted in excessive ion accumulation in drainage, reduced fruit weight, and increased blossom-end rot incidence. The findings suggest that EC management is critical for maintaining optimal root zone conditions and minimising nutrient imbalances in coir-based hydroponic tomato production.

Regional applicability

This study is directly applicable to protected horticulture in the United Kingdom, particularly commercial glasshouse tomato production where soilless systems are increasingly used. The use of coir substrate and EC-based nutrient management reflects practices common in UK horticultural operations, though local water quality and environmental conditions may necessitate adaptation of the optimal EC values identified.

Key measures

EC level of irrigation solution (1.0, 1.5, 2.0, 3.0 dS·m⁻¹); fruit weight; fruit number; total yield; blossom-end rot incidence; drainage ion concentrations (NO₃-N, P, Ca, Mg); soluble solids content

Outcomes reported

The study measured tomato fruit weight, yield, fruit number, blossom-end rot incidence, and inorganic ion concentrations in drainage solution across four EC levels of irrigation solution. Results showed optimal EC level of 1.5 dS·m⁻¹ for yield and fruit quality, with higher EC levels causing ion accumulation in drainage and reduced fruit size.

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