Substrate and root zone

Practice question

When does a move from soil to substrate make sense, and what does it require in investment, skills, service and waste management?

Local relevance

Many greenhouses in the region grow in soil, often with sandy or saline conditions. Substrate cultivation can give better control over water and nutrients, but changes daily operations, purchasing and waste streams. The decision depends on crop, water quality, investment capacity and available support.

Possible interventions

• Interpreting signals from the root zone and drainage water
• Structured comparison of growing media under comparable conditions
• Planning for end-of-life, reuse and waste handling
• Training in substrate irrigation strategy

Conditions

• Comparable growing conditions for any comparison
• Clear system boundaries, crop, season and measurement design
• Local supply and technical service

Research questions

• Which substrate strategies fit existing low- and mid-tech greenhouses?
• What are the full costs over the lifetime, including waste?

Measurement points

• Root zone EC and pH, drainage percentage
• Yield and quality per m²
• Purchase, replacement and disposal costs