Lab 4 Worksheet - Abiotic Stressors
pdf
keyboard_arrow_up
School
University of Guelph *
*We aren’t endorsed by this school
Course
2470
Subject
Industrial Engineering
Date
Jan 9, 2024
Type
Pages
6
Uploaded by MasterTurkey2112
AGR*2470
Lab 4: Abio0c Factors and Crop Adapta0on
As with Lab 3, There are two parts to this lab:
Part 1
involves observing plants subjected to various treatments, all related to abio0c stress.
Part 2
involves listening to the presenta0on from your TA and reading the informa0on
posted from the OCCA Study Guide and then answering ques0ons on the lab sheet.
Please note that some of the ques0ons will require addi0onal sources of informa0on and
research to properly explain you answers to the ques0ons.
A large por0on of Part 2 will be independent work
Part 1:
-
There will be popcorn seedlings planted on Sep 15.
-
They are subjected to four different stressors:
o
drought;
o
flood;
o
salt (high urea applica0on);
o
cold treatments
-
Observe the plants and record the following in the spaces provided on the
worksheet:
o
Visual observa0ons of the symptoms from different abio0c stressors
▪
Base your observa0ons on the differences discussed in lecture that
you can see
o
Measurements of the environmental condi0ons of those stress-imposed
treatments
▪
Soil temperature
▪
Soil pH
▪
Soil moisture
▪
Electrical conduc0vity (EC)
-
Take photos of the plants and include them in your assignment
-
Answer the ques0ons related to your observa0on on the worksheet
1.
Describe the symptoms of the three species from different abio0c stressors. Be as
specific as possible and include photos with each descrip0on that you record
(5
points for each treatment)
i)
Treatment 1
ii)
Treatment 2
iii)
Treatment 3
iv)
Treatment 4
2.
Record the following soil condi0ons for each treatment
(10 points)
3.
Diagnose each treatment from these op0ons: cold, drought, flood, salt stress (1 point
for each treatment)
1)
Treatment 1:
2)
Treatment 2:
3)
Treatment 3:
4)
Treatment 4:
Part 2: Based on the lecture in lab, the reading material from the OCCA study guide, and any
addi0onal sources of informa0on, please answer the following ques0ons to the best of your
ability:
1.
A light spring frost on corn at the three-leaf stage is most likely to result in (
1 point
):
(A) faster growth
(B) no damage
(C) death of the en0re plant
(D) death of the leaves aboveground
E1
-‘Explain’ your answer (
1 point
)
2.
Which of the following perennial grasses does not survive consistently in Ontario (
1
point
)?
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
(A) perennial ryegrass
(B) smooth bromegrass
(C) orchardgrass
D) 0mothy
3.
The impact of excess water in the field on crop growth and quality (
1 point
):
(A) is less significant in a no 0ll system
(B) is independent of temperature
(C) can depend on the crop phenological state
(D) does not involve pathogens and insects either directly or indirectly
4.
Which of the following is FALSE? (
1 point
)
(A) Corn is less sensi0ve than soybean to drought during germina0on and emergence.
(B) Soybean is less tolerant to brief weather stresses than corn.
(C) All seeded crops are sensi0ve to abio0c stresses during pollina0on, fer0liza0on and early
seed development.
(D) Adequate moisture for germina0on and emergence is cri0cal in all crops.
E2
-‘Explain’ your answer for
(
1 point
)
5.
Narrowing row spacing in soybeans (
1 point
):
(A) can decrease the risk of white mold
(B) increases compe00on between plants if the plant popula0on is held constant
(C) tends to improve yield at higher plan0ng popula0on
(D) tends to decrease the energy-use efficiency for sunlight and yield
E3
-‘Explain’ your answer for
(
1 point
)
6.
Which of the following are all factors to consider when selec0ng seeding depth? (
1 point
)
(A) soil organic maeer content, soil temperature, soil crus0ng
(B) depth to soil moisture, soil temperature, soil fer0lity
(C) depth to soil moisture, soil fer0lity, plan0ng method
(D) depth to soil moisture, soil temperature, soil crus0ng.
7.
Plan0ng corn less than 2.5 cm deep is not recommended because it ofen results in
(
1 point
):
(A) increased risk of damage from soil insects
(B) increased risk of frost damage
(C) poor development of nodal roots
(D) delayed emergence in moist soil
8.
In Southwestern Ontario, the recommended seeding dates in a specific year for various
crops are in the following order (from 1
st
to last seeded). (
1 point
)
(A) spring canola, spring cereals, winter wheat, corn, white beans, soybeans
(B) spring cereals, spring canola, corn, soybeans, white beans, winter wheat
(C) alfalfa, spring cereals, corn, soybeans, white beans, winter wheat
(D) winter wheat, spring cereals, spring canola, corn, white beans, soybeans
9.
Developmental responses in crop plants are very sensi0ve to temperature. The Table
below illustrates the influence of various temperature parameters on flower bud forma0on
and stem length in greenhouse-grown chrysanthemums. The data represent the mean of
two experiments in which the day and night were each 12 hours long.
(i)
What can be concluded about the rela0onship between the rate of flower bud forma0on
in chrysanthemum and temperature? Is there a difference between the effect of day0me
temperature vs. nighhme temperature? Be as specific as possible (
2 marks
).
(ii)
What can be concluded about the rela0onship between stem elonga0on in
chrysanthemum and temperature? Again, does there seem to be more of an effect of either
day0me or nighhme temperature? Be as specific as possible (
2 marks
).
(iii)
How might a greenhouse manager take advantage of the rela0onships found above
(
3 marks
)?
10. Table 4.8 shows the propor0on of maximum yield that would be expected for a corn crop
depending on plant popula0on and plan0ng date.
Day temperature (
o
C)
20
10
15
10
20
Night temperature (
o
C)
10
20
15
10
20
Average temperature (
o
C)
15
15
15
10
20
Number of short days to flower bud visible
29.0
29.9
29.4
40.3
23.9
Stem length afer 42 short days (cm)
61.4
36.4
59.9
28.8
52.8
- Based on the data shown in the table, explain the rela0onship between plant popula0on
and plan0ng date (3 points)
- Ul0mately, which factor seems to have the greatest influence on poten0al yield? (2 points)
- Assuming a high cost of corn seed, do you think that there would be value in increasing
plant popula0on from 20,000 PPA to 30,000 PPA if corn is seeded at the ideal date for
Ontario? (2 points)
- When would increasing plant popula0on as described above be advantageous? (2 points)
- Why or why not (include some of the issues with plan0ng outside of the ideal plan0ng
date)? (2 points))
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Related Documents
SUMAPS5200_002_2021_3-INTEGRATIVECAPSTONEWORKSHOPSUMAPS5200_002_2021_3-INTEGRATIVECAPSTONEWORKSHOPTh
SUMAPS5200_002_2023_2-INTEGRATIVECAPSTONEWORKSHOPSUMAPS5200_002_2023_2-INTEGRATIVECAPSTONEWORKSHOPTh