Grain Crops 3

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  1. Factors influencing corn dry down?
    • Genetic (pericarp, husk, ear declination)
    • Environment (temp, humidity, sunshine, rain)
    • G*E+Management (time of maturation)
  2. What is the average moisture dry down per day? Does it matter what month the corn matures in?
    Yes. .8 percent point/day if August. .4 if crop matures in mid-September
  3. In wheat, what determines the maximum head number and tiller?
  4. In wheat, the head size, number of spikelets per spike, is determined by what?
    mid to late tillering
  5. when is kernel number per spikelet in wheat determined?
  6. what determines kernel size in wheat?
    resource availability and crop health beginning at flag leaf emergence through grain fill
  7. When should you sow winter wheat in southern MO?
    Oct 14
  8. Why the Oct. 14 date?
    • Usually within two weeks of frost
    • Hessian-fly-free-date
    • Also, aphid injury/disease
  9. When would you sow spring type wheats in s. mo?
    March, early April
  10. Winter wheat - problems if you plant too early?
    Too much tillering could "joint", get winter injury
  11. Winter wheat - potential trouble from planting too late?
    Thin stands, fewer tillers
  12. Diploid and tetraploid wheat probably occurred when and where?
    Before 8000 BC in fertile crescent
  13. Most bread wheat today is what kind of "ploid"?
  14. Wheat was sown in the earliest settlements in N America about when?
    1602, 1611, 1621
  15. The US produces more wheat varieties in volume than other countries. Largest variety produced?
    • Hard red winter wheat (about 50 percent of all wheat crops)
    • Followed by red spring (about 1/5 of all wheat crops)
    • Soft red winter and white (about 1/4)
    • Durhum (roughly 5 percent)
Card Set
Grain Crops 3
grain crops test 3
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