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The flashcards below were created by user
jenmuz
on FreezingBlue Flashcards.
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Factors influencing corn dry down?
- Genetic (pericarp, husk, ear declination)
- Environment (temp, humidity, sunshine, rain)
- G*E+Management (time of maturation)
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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
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In wheat, what determines the maximum head number and tiller?
Jointing
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In wheat, the head size, number of spikelets per spike, is determined by what?
mid to late tillering
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when is kernel number per spikelet in wheat determined?
Jointing
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what determines kernel size in wheat?
resource availability and crop health beginning at flag leaf emergence through grain fill
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When should you sow winter wheat in southern MO?
Oct 14
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Why the Oct. 14 date?
- Usually within two weeks of frost
- Hessian-fly-free-date
- Also, aphid injury/disease
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When would you sow spring type wheats in s. mo?
March, early April
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Winter wheat - problems if you plant too early?
Too much tillering could "joint", get winter injury
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Winter wheat - potential trouble from planting too late?
Thin stands, fewer tillers
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Diploid and tetraploid wheat probably occurred when and where?
Before 8000 BC in fertile crescent
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Most bread wheat today is what kind of "ploid"?
hexaploid
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Wheat was sown in the earliest settlements in N America about when?
1602, 1611, 1621
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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)
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