What is the goal of zone sampling?

• A. To determine the average soil test values for uniform zones in a field.
• B. To map irrigation equipment locations.
• C. To identify crop yield potential across the entire field.
• D. To measure rainfall distribution.

Answer: (A)

Zone sampling aims to capture soil fertility differences within a field by dividing it into uniform management zones and taking samples within each zone. The goal is to determine the average soil test values for those uniform zones so fertilizer and lime recommendations can be tailored to each zone, matching inputs to soil needs and reducing waste. This approach improves nutrient use efficiency and minimizes environmental risk compared to applying a single rate across the entire field. It’s not about mapping irrigation equipment, predicting overall yield potential, or measuring rainfall distribution, which are separate concerns.