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RRG611S - RANGELAND REGENERATION - 2ND OPP - JULY 2023 |
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n Am I BI A u n IVER s I TY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF HEALTH, NATURAL RESOURCESAND APPLIEDSCIENCES
SCHOOL OF AGRICULTURE AND NATURAL RESOURCESSCIENCES
DEPARTMENT OF AGRICULTURAL SCIENCESAND AGRIBUSINESS
QUALIFICATION: BACHELOR OF SCIENCE IN AGRICULTURE
QUALIFICATION CODE: BAGA
COURSE CODE: RRG6 l l S
LEVEL: 7
COURSE NAME: RANGELAND REGENERATION
SESSION:
JULY 2023
PAPER:
THEORY
DURATION:
3 HOURS
MARKS:
100
SECOND OPPORTUNITY/SUPPLEMENTARY EXAMINATION QUESTION PAPER
EXAMINER($) Dr Edgar Mowa
MODERATOR: Dr Hilma Amwele
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLE MATERIALS
1. Examination question paper
2. Answering book
THIS QUESTION PAPER CONSISTS OF 3 PAGES (Including this front page)
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1. Define the following:
(3)
(a)
Decreaser species
(b)
Increaser II species
(c)
Benchmarks
2. Label the leaf bases below (a-g): -
[7]
l
a
b
C
d
e
f
g
3. Discuss how a farmer in the Omaheke region can set-up a benchmark in his farm and how he
[8]
will benefit from setting-up the said benchmark. Currently, his farm has 7000ha of rangeland
but it fails to support 100 Large Stock Units from one rainfall season to the next.
4. How do you determine if a leaf is simple or compound?
(4]
5. Suppose that during a drought, and grass species A is still alive in both the benchmark and the [SJ
surroundings, grass species B is found to have died in both the benchmark and the
continuously grazed surroundings, grass species C is found to have died out in the surroundings
but survived in the benchmark:
a. Which species is resistant to continuous grazing?
b. Which is likely to be a mesophyte?
c. Which species is likely to be a palatable xerophyte?
d. Which species is likely to be an unpalatable xerophyte?
e. Which species would you collect seeds from to re-establish in the surrounding areas after
the introduction of good grazing management?
6. Name any 2 plant species with compound leaves and any 2 with simple leaves? (Scientific
[4]
names only).
7. Name any 2 plant species with paripinnate compound leaves and any 2 with imparipinnate
[4]
compound leaves? (Scientific names only).
8.
Suppose a farmer with rangeland of 9000ha estimates at the end of the growing season
(10]
that a representative square with sides of 45m is required by one LSUday and that the dry
season will last for 250 days.
9. Draw and fully label a flower and its parts; inferior vs superior.
(10]
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10. Suppose a rangeland of 12000ha yields an average of 70gDM/m2. Using the objective method, [10]
calculate the number of Large Stock Unit (LSU)and Small Stock Unit (SSU)that the farmer
should stock for that year?
Differentiate between assumptions of the Subjective and Objective methods of grazing
(10]
capacity estimations.
11. Explain rangeland management that could cause cattle not to conceive.
[10]
12. Suppose that monitoring by a farmer shows that, in order to prevent overgrazing, the
[6]
maximum grazing period should not exceed 40 days while the minimum rest period should be
at least 160 days.
13. How can you combine herding and fencing to effectively benefit on your farm?
(4]
14. Describe the main methods used for control of bush and weed encroachment.
[SJ
2