AGRY 525 Quiz V

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Author:
MRK
ID:
271325
Filename:
AGRY 525 Quiz V
Updated:
2014-04-21 15:56:54
Tags:
yield components plant growth
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Yield components
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  1. Yield components for: Small Grains, Corn, Soybeans
    • SG: heads/acre * seeds/head * mass/seed
    • Corn: pop set, ears/plant * seeds/ear * weight/seed
    • Soybean: pods/plant * seed/pod * weight/seed
  2. Visualize Yield as cube
    • Yield = volume
    • homeostasis: consistent performance across enviroments
    • Dimentions can change as long as volume consistant
    • No G x E interactions
  3. Sequential/Determinate Plants
    • Corn, oats
    • when problem shows up later, harder to compensate
    • most crops
    • Not flexible
  4. Indeterminate Plants
    • Soybean
    • all three components are determined simultaniously
    • pods/plant biggest change
    • seeds/pod pretty constant
  5. Yield for turf/forage/Vegetative
    grasses, Legumes
    • Grasses: # tillers/area * mass/tiller = mass yield / area
    • Legumes: plants/area (ie persistence) * tillers/plant * mass/tiller
  6. Tall Fescue Turf v. Forage
    Same yield but turf has more small tillers
  7. Tissue temperature
    • ≠ air temp
    • If transpiration impaired = warmer
    • if rapid transpiration = cooler
    • latent heat of transpiration
  8. Lethal dose of Heat
    • temperature and time required to Kill 50% of the plants
    • Potato: 43, Corn: 50, Wheat: 60
  9. Influence of N fert on Tall Fescue
    • reach optimum tiller density
    • Then just add weight
    • For yield want big tillers b/c will run out of space
    • but usually either or
  10. Plant/a x shoots/plant x mass/shoot = yield/A
    For forage
    • plant/acre: is an optimum
    • shoots/plant: declines, but some better at low
    • mass/shoot: No G x Pop interaction, some just better
  11. N fertilizer affect on growth of rice
    • panicles/m2 is the biggest difference
    • increase in seeds/panicle
    • no change in weight
    • IE yield increased
  12. Yield and yield components for soybeans
    • pods/plant changes
    • seeds/pod is usually set for vareity
    • seed size is set but can differ between
  13. Turf NAR
    low, like clover canopy (shading)
  14. yield in tall fescue
    • yield/area is very similar to yield/tiller
    • density is maxed out
    • in breeding should  shouldn't pick many tillered
  15. Era study
    • Yield: 50 % higher
    • Ears/plant: more
    • Kernals: more
    • early and late grain fill
    • Upright leaves

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