Pak choi
Brassica rapa subsp. chinensis is well suited to hydroponic self-sufficiency in DWC or NFT.
Why this crop makes sense
It has a short growing cycle and a high proportion of edible biomass. The decisive question is not merely whether the plant grows hydroponically, but whether its edible yield, growing period, light requirements, workload and storage life suit the household.
System and root space
DWC or NFT is recommended. The root zone must remain evenly moist, well aerated and protected from light. Record the source water and nutrient solution; returns, pipes and reservoirs must remain accessible and easy to clean.
Suitable system pages: Deep Water Culture (DWC) · Nutrient Film Technique (NFT)
pH, EC and climate
A cautious starting range is pH 5.8–6.5 and EC 1.4–2.0 mS/cm at 15–22 °C. These are not universal target values: cultivar, age, light, source water, temperature, measuring method and development stage may require adjustments.
Sowing and crop management
Heat and long days encourage bolting, so maintain rapid, uniform growth. A small preliminary trial checks germination and system performance. Space plants approximately 18–25 cm apart and regularly inspect root health, leaf colour, pests and uniform water distribution.
Harvesting and storage
Harvest whole plants or individual leaves. For storage, refrigerate briefly. Process only healthy, clean plant parts and follow the food-hygiene requirements of the chosen preservation method.
Troubleshooting
- Tall, soft plants: check light levels, spacing and temperature.
- Leaf-edge damage or chlorosis: check not only EC but also pH, water hardness and nutrient formulation.
- Brown roots: investigate temperature, oxygen supply, hygiene and waterlogging.
- Uneven yields: compare flow rates, emitters, plant spacing and cultivars.