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Subelement Y3

YAM HARVESTING AND STORAGE

Section Y3A

Harvest timing and indicators

What is the primary indicator that yams are ready for harvest?

  • Flowering of the vines
  • Correct Answer
    Senescence (yellowing and dying back) of the vines
  • Exactly 90 days after planting regardless of variety
  • First appearance of new shoots
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How long after planting are most varieties of Dioscorea rotundata (white yam) typically harvested?

  • 2-3 months
  • 4-5 months
  • 6-7 months
  • Correct Answer
    8-11 months
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What traditional technique is used to determine if yams are mature enough for harvest?

  • Correct Answer
    Carefully exposing the top of the tuber to check its size
  • Measuring leaf size
  • Counting the exact number of leaves
  • Testing soil acidity
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What time of year are yams typically harvested in tropical West Africa?

  • March to April
  • June to July
  • Correct Answer
    November to January
  • Throughout the year regardless of season
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What happens to yam tuber quality if harvesting is significantly delayed after maturity?

  • They become more nutrient-dense
  • Correct Answer
    They may become fibrous or begin to rot
  • They transform into sweet potatoes
  • They develop an ability to photosynthesize
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Which factor most significantly affects the timing of yam harvests in traditional farming systems?

  • The phase of the moon
  • Government regulations
  • Industrial processing schedules
  • Correct Answer
    Seasonal precipitation patterns
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What harvest timing consideration is specific to water yams (Dioscorea alata)?

  • Correct Answer
    They can have a longer growing season than white yams
  • They must be harvested before sunrise
  • They must be harvested during rainfall
  • They can only be harvested during full moons
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Which visual indicator in the field helps farmers determine yam harvest timing?

  • Appearance of flowers on nearby trees
  • Migration patterns of local birds
  • Correct Answer
    Senescence of the vines and drying of leaves
  • Change in soil color from brown to red
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What harvest timing practice is used in the "milking" system of yam cultivation?

  • Harvesting only during morning hours when dew is present
  • Correct Answer
    Early partial harvest followed by a final harvest at full maturity
  • Harvesting only female plants first, followed by male plants
  • Harvesting exclusively during nighttime hours
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