Future Farmers of America (FFA) Agronomy Career Development Events (CDE) Practice Exam 2026 - Free Agronomy CDE Practice Questions and Study Guide

The correct choice is sand, as sandy soils typically have larger particle sizes and lower cation exchange capacities compared to other soil types. This characteristic means they hold less acidity and have a naturally higher pH level than clay, silty, or loamy soils. Consequently, sandy soils may already be close to neutral or only slightly acidic, requiring less agricultural lime to adjust the pH.

Clay soils, being more compact and having a higher cation exchange capacity, can retain more acidity and therefore often require more lime to neutralize the pH. Silty soils also retain moisture and nutrients better than sandy soils and can present similar acidity challenges, requiring more lime. Loam, a balanced mix of sand, silt, and clay, possesses moderate cation exchange capacity, making it versatile but also potentially requiring lime adjustments depending on its specific composition and buffering capacity. Thus, when comparing these soil types, sandy soil stands out as needing the least amount of agricultural lime for pH adjustment.