Sweet potatoes
Ipomoea batatas is suitable for experimental hydroponic production in a deep, broad bed of drip-irrigated substrate.
Why this crop is worthwhile
Leaves and storage roots are separate production goals; both require considerable space and light. The question is not only whether a plant grows hydroponically, but also whether its edible proportion, growing time, light requirements, workload and storage life suit the household.
System and root space
A deep, broad bed of drip-irrigated substrate 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.
Relevant system page: Drip irrigation and Dutch buckets
pH, EC and climate
A cautious starting range is pH 5.5–6.5 and EC 1.8–2.5 mS/cm at 22–30 °C. These are not universal target values: the cultivar, age, light, source water, temperature, measurement method and growth stage may require adjustments.
Planting and crop management
Leaf and storage-root production are separate goals; provide abundant light and a completely dark zone for storage-root formation. Run a small preliminary trial to check establishment and behaviour in the system. Space plants approximately 35–50 cm apart and regularly inspect root health, leaf colour, pests and even water distribution.
Harvesting and storage
Harvest young leaves or mature storage roots. Cure the roots in warm, dry conditions before storing them. Process only healthy, clean plant material and follow the food-hygiene requirements of the chosen preservation method.
Troubleshooting
- Long, soft plants: Check light levels, spacing and temperature.
- Leaf-edge damage or chlorosis: Check not only EC, but also pH, water hardness and the nutrient formulation.
- Brown roots: Investigate temperature, oxygen, hygiene and waterlogging.
- Uneven yields: Compare flow, emitters, plant spacing and cultivars.