What is typically the primary source of nutrients in hydroponic systems?

In hydroponic systems, the primary source of nutrients is a nutrient solution. This solution consists of water mixed with essential minerals and nutrients that plants need to grow, such as nitrogen, phosphorus, potassium, calcium, and trace elements. The advantage of using a nutrient solution is that it allows for precise control over the nutrient levels and pH, creating an optimal growing environment for the plants.

Soil, while a traditional source of nutrients in agriculture, is absent in hydroponic systems; therefore, it cannot provide the necessary nutrients for plant growth in this context. Rockwool is used as a growing medium in some hydroponic systems to provide support to the plants but does not supply nutrients on its own. Pesticides are applied to control pests and diseases but do not serve as a nutrient source for plants. Thus, the nutrient solution is the foundation for growth in hydroponics as it directly meets the plants' nutritional requirements, promoting healthy development.