Which factor is NOT part of the effectiveness rating for liming materials?

In the context of evaluating the effectiveness of liming materials, the particle size of the material, as well as the proportion of the material that can pass through specific mesh sizes, are critical factors. These aspects influence how quickly and efficiently the lime can react with the soil, thereby raising pH levels and improving soil health.

The particle size of the material affects its surface area; smaller particles have a larger surface area to volume ratio, allowing for faster dissolution and reaction with soil acidity. Similarly, details about what percentage of the material passes through the 2 mm and 0.25 mm screens are important because these measurements give insight into how fine the material is and how effectively it can integrate into the soil.

In contrast, the color of the liming material is not relevant to its effectiveness in agricultural applications. It does not affect the chemical properties or the reactivity of the lime with soil. Thus, while factors related to the physical and chemical interaction of the material with the soil are vital for determining effectiveness, color does not have any bearing on the performance or outcomes of liming in nutrient management practices.