The level of inorganic nutrients is a room property in Creatures 2. Some plants use inorganic nutrients to determine where they will grow; for example, the potatoes will only grow in rooms that have an inorganic nutrient value between 130 and 200. Like other room properties, it can be tracked with the Ecology Kit.
The inorganic nutrient value of a room does not change over time, and different values were intended to be used consistently across a world to break it up into different soil types:
|Inorganic nutrient value range||Soil region|
|10-20||Caves - bare|
|70-120||Caves - fertile|