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Agronomy Final Exam Question and answers verified to pass
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Agronomy Final Exam Question and answers verified to pass Soil Temperature - correct answer usually cooler than air temperature in the spring, plant too early and seeds struggle to germinate, wait too long and plants will lose part of the growing season Crop Species - correct answer early...

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  • February 24, 2025
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  • 2024/2025
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Agronomy Final Exam Question and
answers verified to pass
Soil Temperature - correct answer ✔usually cooler than air temperature in
the spring, plant too early and seeds struggle to germinate, wait too long and
plants will lose part of the growing season


Crop Species - correct answer ✔early crops can be planted when the soil is
average 40 degrees, summer crops can be planted when soil temp is average
50 degrees


Alfalfa - correct answer ✔Minimum Soil Temp= 34 degrees
Optimal soil temp= 77 degrees


Corn - correct answer ✔Minimum Soil Temp= 50 degrees
Optimal Soil Temp= 61-90 degrees


Oat - correct answer ✔Minimum Soil Temp= 41 degrees
Optimal Soil Temp= 68-75 degrees


Soybean - correct answer ✔Minimum Soil Temp= 50 degrees
Optimal Soil Temp= 77 degrees


Wheat - correct answer ✔Minimum Soil Temp= 39 degrees
Optimal Soil Temp= 68 degrees

,Enzyme - correct answer ✔regulate all functions within the plant, warmer
temperatures stimulate activity


Q10= 2 rule - correct answer ✔for each 10 degrees Celcius rise in
temperature, the enzyme reaction rate will double (will double rate of reaction)


Cool Season Plant - correct answer ✔C3 plants are called temperate, utilize
the C3 dark reaction to fix carbon, 30-50% of carbon lost in photorespiration
which increases warmer air temperatures, optimal temp is 65-75 degrees


Warm Season Plant - correct answer ✔C4 plants are often called tropical,
utilize the C4 dark reaction to fix carbon, highly efficient and little fixed CO2 is
lost in photorespiration, optimal temp is 85-95 degrees


Heat Unit - correct answer ✔used to estimate the rate of crop development
and maturity based on air temperature
Average Daily Temperature - Base Temperature
Main problem is that they tend to overestimate growth when the days are hot


Wheat - correct answer ✔Base Temperature = 40* F


Corn - correct answer ✔Base Temperature = 50*F


Soybean - correct answer ✔Base Temperature = 50*F


Cotton - correct answer ✔Base Temperature = 60*F

, Growing Degree Days (GDD) - correct answer ✔places limits on the low and
high daily temperature so only temperature that result in plant growth are
considered


Corn - correct answer ✔GDD= [(Tmax + Tmin) / 2)] - Tbase
Tmax= max daily temperature and is set to 86* if temp exceeds 86*
Tmin= minimum daily temp, set to 50* if temp fall below 50*
Tbase= base temperature (50*)


Seasonal GDD - correct answer ✔calculated by summing the daily GDD
during the growing season


Heat Stress - correct answer ✔almost always occurs in conjunction with
drought stress, rarely by itself


Heat Stress Symptoms - correct answer ✔Drooping leaves, loss of green
foilage color, withering flowers/buds, little root growth


Sterility - correct answer ✔flowing can be inhibited or flowers wither,
resulting in partial or complete loss of seed yield


Transpiration - correct answer ✔the escape of water from stomata, 99% of
water is lost through this process


Upright Leaf Angle - correct answer ✔defense mechanism to heat stress,
adjust to optimize sunlight


Leaf Rolling - correct answer ✔a response of the plants like corn to
insufficient plant moisture during hot temperatures, bulliform cells collapse

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