What role does soil pH play in relation to plant growth?

Soil pH is a critical factor influencing plant growth because it directly affects the solubility of nutrients and minerals in the soil. When the pH of the soil is within an optimal range, essential nutrients such as nitrogen, phosphorus, and potassium are more available for plant uptake. If the soil pH is too low (acidic) or too high (alkaline), it can lead to nutrient deficiencies or toxicities, which may hinder plant growth, health, and development.

In contrast, soil pH does not directly determine the color of plants, indicate growth rates, or affect a plant's resistance to pests in a straightforward manner. These factors may have connections to pH, but they do not encapsulate the primary function of pH in relation to the nutrients that are essential for plant health. Hence, controlling material solubility through the management of soil pH is pivotal for successful horticultural practices.