Teeltmedium

Teeltmedium is a Dutch term for the substrate used to grow plants in horticulture, especially in greenhouse production. It functions as the rooting medium, providing physical support, storing water, delivering nutrients, and allowing sufficient air to the roots. Teeltmedium is typically used in soilless or substrate-based cultivation and can replace or augment natural soil.

Common teeltmedia are designed to be nutrient-poor and are often composed of organic or mineral materials. Typical components include peat-based substrates, coconut coir, bark fibers or wood fiber, perlite, vermiculite, and rockwool. They are usually sold as loose media or in preformed blocks that expand when wetted. The media are selected for defined physical properties such as water retention, drainage, and aeration, as well as chemical characteristics like pH, electrical conductivity (EC), and cation exchange capacity.

In practice, teeltmedium requires management through fertigation to supply nutrients, since many substrates lack substantial inherent fertility. pH and EC are monitored and adjusted to optimize nutrient availability for the crop. The advantages of using teeltmedium include precise control over water and nutrient delivery, consistency in crop performance, and the possibility of reusing or recycling media where feasible. Environmental and sustainability considerations influence media choice, with increasing use of renewable materials and concerns about peat extraction driving interest in alternatives such as coco coir and wood fibers. Proper sanitation, irrigation scheduling, and regular substrate testing are important to prevent disease and salt buildup.

Overall, teeltmedium is a key element of modern greenhouse cultivation, enabling efficient, controlled, and crop-specific production.