Summary
This study examined nutrient solution dynamics in recirculating hydroponic pepper cultivation under continuous artificial lighting, comparing 12-hour photoperiods with continuous illumination. Under continuous light, nutrient uptake increased approximately 1.8-fold compared to cyclic lighting (except phosphorus). The research identified critical management challenges including rapid pH rise to neutral/alkaline levels and depletion of phosphorus and nitrogen during extended cultivation, and recommends starting solutions at pH 5.6 with half-strength Otsuka A formula (EC 1.4 dS m⁻¹) and progressively acidifying and supplementing nitrogen and potassium in replenishment solutions after approximately one month.
Regional applicability
This research addresses controlled-environment horticulture using recirculating hydroponic systems, which are applicable to United Kingdom glasshouse and vertical farming operations. The findings on nutrient depletion dynamics and pH management in closed systems are transferable, though UK growers would need to adapt recommendations to their specific cultivars, growing conditions, and available nutrient formulations. The study's relevance is primarily to intensive indoor production systems rather than field-based UK horticulture.
Key measures
Electrical conductivity (EC), pH, concentrations of nitrogen (nitrate and ammonia forms), phosphorus, potassium, calcium, magnesium, water uptake, and nutrient absorption under varying CO2 concentrations (340 and 800 ppm) and relative humidity (50% and 80%)
Outcomes reported
The study investigated fluctuations in electrical conductivity (EC), major mineral concentrations, and pH in circulating nutrient solutions during pepper cultivation under continuous fluorescent illumination, and developed management recommendations to maintain optimal nutrient availability over extended production cycles.
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