Which characteristic is NOT associated with hydroponic systems?

Hydroponic systems are defined by their method of growing plants in a nutrient solution without the use of soil. Instead, plants receive the minerals and nutrients they need directly from this solution. This approach allows for greater control over the growing environment and can lead to more efficient nutrient uptake.

The characteristic of requiring a nutrient solution is fundamental to all hydroponic systems, as this is the primary means of providing essential elements to the plants. Utilizing artificial lighting is also common in hydroponics, particularly in controlled environments where natural light may be insufficient, enhancing growth and yield regardless of external conditions. Furthermore, hydroponic systems can be automated, allowing for more efficient monitoring and management of nutrient delivery and environmental conditions.

Thus, the use of soil as a growing medium is directly contradictory to the principles of hydroponics, highlighting that it does not align with the core characteristics of hydroponic systems.