When Laterlite Agri Expanded Clay is used as an improver in a substrate based on organic substances (e.g. peat or compost) it:
For these reasons Laterlite Agri is a fundamental component in substrates, and ensures the long-term efficiency of the plant+pot system.
Good substrate drainage and aeration are in fact indispensable for a plant to absorb the water and mineral salts it requires for all its physiological functions (branching, flowering, fruiting, etc.) whereas poor drainage or aeration will retard root respiration and may encourage root disease and parasitic fungi.
Similar problems may result if the substrate in the pot becomes compacted due to the growth of the roots themselves, the decomposing organic components, or the movement of irrigation water. Laterlite Agri Expanded Clay significantly reduces these effects.
The correct proportions of Laterlite Agri and growth substrate will depend on the plant type and the irrigation system. In general they range from 20% (1 part Laterlite Agri + 4 parts organic component) to 40% (2 parts Laterlite Agri + 3 parts organic component).
For particular plant types (e.g. orchids) the substrate can be made from expanded clay only.