What is one key factor that must be evaluated when testing soil?

When testing soil, evaluating nutrient levels and pH is essential because these factors directly influence soil fertility and plant health. Nutrient levels indicate the availability of essential elements like nitrogen, phosphorus, and potassium, which are crucial for plant growth. If the levels of these nutrients are inadequate, plants may struggle to thrive or exhibit deficiencies, affecting yield and quality.

The pH of the soil is a critical measure because it affects nutrient availability as well. Certain nutrients become less accessible to plants at specific pH levels. For instance, in highly acidic soils, certain nutrients like calcium and magnesium may be deficient, while others may become toxic. Maintaining an optimal pH range allows for better nutrient uptake and ensures that plants can access the necessary elements for robust growth.

In summary, assessing both nutrient levels and pH provides a comprehensive understanding of soil health and fertility, enabling informed decisions on amendments necessary for crop productivity.