PI-009: Seed Potato Tuber Inspection
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9a: Tubers not firm
Firm is a term used in the Seeds Regulations Part II to indicate tuber quality for germination. Graded seed potatoes should be mature and firm (turgid). It should be remembered that as tubers age in storage they begin to lose moisture and turgidity. In some instances, when shipments are made late in the shipping season (i.e. late April or May), tubers may have difficulty meeting the firmness requirements.
- Tubers not firm (or flabby tubers) should be scored based on the descriptions given below:
- Firm means that the potato is compact, solid, not shrivelled, flabby or pliable, and is unyielding to moderate pressure.
- Flabby means that the potato is soft, limp, pliable and yields to moderate pressure.
9b Outgrown Spourts
- At Domestic Shipping Point:
Outgrown sprouts are scored when the length exceeds 3/4 inch (20 mm).
- At Domestic Destination:
Outgrown sprouts are scored when the length exceeds 1 inch (25 mm).
- In scoring outgrown sprouts, a tolerance of 10% by count, means that 10% of the tubers may have sprouts exceeding the maximum length allowed, but the remaining 90% of the tubers must not have sprouts exceeding the maximum length allowed.
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