Potato Quality Control

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Questions and Answers

What percentage of potatoes with perforations or galleries are allowed in the Yellow Potato grade?

20 percent

5 percent

15 percent

10 percent (correct)

What is the tolerance for wet rottenness in the Extra grade?

0 percent (correct)

15 percent

10 percent

5 percent

What percentage of potatoes with sprouted growth are allowed in the Yellow Potato grade?

5 percent

3 percent (correct)

2 percent

1 percent

How are tolerances for different damages or defects referred to in the grading process?

Product weight percentage Signup and view all the answers

What is the criteria for grading potatoes that have been stored?

The same requirements as the present norm Signup and view all the answers

What determines the commercial value of a potato grade?

The larger the potato, the higher the commercial value Signup and view all the answers

What is the minimum size of a white potato to be classified as Extra Grade?

8 cm wide Signup and view all the answers

What percentage of potatoes with contusions are allowed in First Grade potatoes?

10% Signup and view all the answers

What is NOT allowed in Extra Grade potatoes?

Verdant or sprouting potatoes Signup and view all the answers

What is the minimum size of a yellow potato to be classified as Second Grade?

Not specified Signup and view all the answers

What is the main criterion for grading potatoes for consumption?

Sanity and maturity stage Signup and view all the answers

Which of the following defects is allowed in First Grade potatoes?

Perforations or galleries Signup and view all the answers

What is the categorization for potatoes that do not meet the Standard grade requirements?

They are sold at a lower price than Second grade Signup and view all the answers

What is the weight range for First grade seed potatoes?

Tubers among 60 g to 80 g Signup and view all the answers

What is the purpose of drying in post-harvest operations?

To reduce the moisture content of potatoes Signup and view all the answers

What is the advantage of harvesting potatoes in water?

It reduces blue stains and external damage Signup and view all the answers

What is the purpose of curing or conditioning in post-harvest operations?

To heal wounds and reduce moisture loss Signup and view all the answers

What is the diameter range for Second grade seed potatoes in terms of their traverse dimension?

Tubers among 45 to 59 mm Signup and view all the answers

Study Notes

Grading of Potatoes

Potatoes are classified into grades based on their size, shape, and quality.
Grades include Extra, First, and Second, with different minimum size requirements for each.
Extra grade potatoes must be at least 8 cm wide for white potatoes, 7.5 cm for colored potatoes, and 6 cm for yellow potatoes.
First grade potatoes must be at least 5.5 cm wide for white potatoes, 5 cm for colored potatoes, and 4 cm for yellow potatoes.
Second grade potatoes have the same minimum size requirements as Extra grade potatoes.

Characteristics of Each Grade

Extra grade potatoes:
No perforations, wounds, or cracks
Less than 5% with contusions
No verdant or sprouted potatoes
First grade potatoes:
Up to 5% with perforations or galleries
Up to 5% with deformations
Up to 3% with wounds or courts
Up to 10% with contusions
No verdant or sprouted potatoes
Second grade potatoes:
Up to 10% with perforations or galleries
Up to 5% with wounds or courts
Up to 10% with healing
Up to 15% with contusions
Up to 5% verdant potatoes
Up to 3% sprouted potatoes
Up to 10% with deformations

Tolerances for Damage

Permitted tolerances for different types of damage vary by grade
Examples of tolerated damages include dry and wet rottenness, mechanical damages, plague damage, and physiological damages

Additional Rules

Up to 10% of product weight can be a different size than suitable for each grade
Tolerances for damages or defects are based on product weight percentage
Potatoes with multiple damages or defects are graded individually
Stored product grade qualification follows the same requirements as fresh product

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Description

This quiz covers the tolerances for different types of damage in potatoes, including wounds, galleries, and deformations. Learn about the acceptable percentages of damaged potatoes in post-harvest operations.