Which factor is NOT involved in evaluating the grade quality of crops?

Evaluating the grade quality of crops involves various factors that directly impact the quality and marketability of the produce. Test weight, for instance, refers to the weight of a specific volume of the crop and is essential for assessing density and quality. Odour can indicate freshness or spoilage and is often considered as part of quality evaluations. The presence of foreign material is another critical factor since it can affect purity and overall quality; higher amounts can lead to lower grades.

Soil pH, however, does not directly relate to the grade quality of the crops themselves at the point of sale or evaluation. While it is an important factor in crop production because it influences nutrient availability and plant health, it does not determine the specific qualities of harvested crops like odour, test weight, or foreign material content. Thus, soil pH is not involved in the grading process of the crops once they are harvested and evaluated.