What is the primary use of electrical conductivity (EC) measurements in horticulture?

The primary use of electrical conductivity (EC) measurements in horticulture is to measure nutrient levels in the substrate. EC indicates the ability of a solution to conduct electricity, which is directly related to the concentration of dissolved salts in that solution. In the context of horticulture, these dissolved salts often include essential nutrients for plant growth, such as nitrogen, phosphorus, potassium, and various micronutrients.

By measuring the EC of the substrate solution, growers can assess whether plants are receiving sufficient nutrients or if there are deficiencies or excesses that need to be addressed. Lower EC readings could indicate nutrient deficiency, while higher readings might suggest nutrient accumulation or even potential toxicity. Consequently, monitoring EC helps in making informed decisions regarding fertilization and nutrient management practices, ensuring optimal plant health and growth.

In contrast, determining plant temperature, testing atmospheric humidity, and assessing light intensity pertain to different aspects of plant growth but do not provide direct information about nutrient levels in the substrate. Understanding these distinctions is essential for effective horticultural management.