Question

In seed technology, the term 'dockage' is commonly used to describe-

• A. Genetic purity of the seeds
• B. Genetic impurity of the seeds
• C. Physical purity of the seeds
• D. Physical impurity of the seeds

Hint:

Dockage represents the physical waste and foreign matter that can be mechanically cleaned out of a seed lot. It should not be confused with genetic impurity, which refers to off-types and cross-contamination.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
In seed technology and trade, seed lots are evaluated for both genetic and physical quality. Physical purity refers to the percentage of pure seeds of the designated crop in a seed sample compared to foreign matter.

Step 2: Detailed Explanation:
The term dockage refers to all foreign materials that can be easily separated from a seed sample using standard screening, aspiration, and cleaning machinery.
These foreign materials include:
1. Inert matter (such as dirt, stones, sand, and plant debris).
2. Weed seeds.
3. Seeds of other crops.
4. Broken or severely damaged grains.
Because dockage represents non-seed or foreign physical matter present in the harvest, it is used as a direct measure of the physical impurity of the seed lot.
Determining the dockage percentage is essential for calculating clean seed yield and assessing commercial price deductions during seed trade.

Step 3: Final Answer:
Thus, dockage is commonly used to describe the physical impurity of the seeds.