Approbation percentage
A metric indicating the degree of varietal purity of a crop field, determined during official field inspection to ensure adherence to seed quality standards.
Также говорят: varietal purity, percentage of varietal purity
The approbation percentage reflects the varietal integrity and quality of the seed stock still standing in the field. This metric is calculated by comparing the number of true-to-type plants against the total sample size, accounting for off-types, different varieties, or weed contamination.
This figure is crucial for classifying seeds into specific categories such as elite or certified classes. A high percentage confirms that proper agricultural practices were followed and that mechanical mixing was avoided during planting.
A common error during assessment is inspecting the field at the wrong growth stage, when diagnostic varietal characteristics are not yet fully visible. It is also vital to ensure the sampling method is statistically representative to avoid skewed data caused by localized patches of contamination.