Which of the following is not used in determining a lime recommendation?

The correct choice is that Exchange Sodium Percentage is not typically used in determining a lime recommendation for soil management practices. Lime recommendations are primarily aimed at adjusting soil pH and improving soil conditions for crop growth, which is influenced by factors such as soil pH levels, soil texture, and cation exchange capacity.

Soil pH levels are critical because lime is applied to raise pH and reduce acidity, which can enhance nutrient availability to plants. Soil texture impacts the amount of lime needed; for example, sandy soils may require different lime rates compared to clay soils due to their differing abilities to retain moisture and nutrients. Cation exchange capacity reflects the soil's ability to hold positively charged ions, such as calcium and magnesium, which are important for maintaining soil health and fertility. Though the Exchange Sodium Percentage is important in assessing soil salinity and sodium-related issues (such as sodicity), it does not directly affect lime recommendation decisions. Therefore, it does not serve as a primary factor in determining how much lime to apply to enhance soil properties and crop growth.