 |
RRG611S- RANGELAND REGENERTION - 1st Opp - JUNE 2022 |
|
|
1 Page 1 |
▲back to top |
nAmlBIA unlVERSITY
OF SCIEn CE Ano TECHn OLOGY
FACULTYOF HEALTH,APPLIEDSCIENCESAND NATURALRESOURCES
DEPARTMENTOF AGRICULTUREAND NATURAL RESOURCES
QUALIFICATION: Bachelor of Science in Agriculture
QUALIFICATIONCODE: 07BAGA
LEVEL: 6
COURSECODE: RRG611S
COURSENAME: Rangeland Regeneration
DATE:June 2022
SESSION: June
DURATION: 3 Hours
MARKS: 100
FIRSTOPPORTUNITYEXAMINATION QUESTION PAPER
EXAMINER(S)
MODERATOR:
Mr Richard Kamukuenjandje
Dr Hilma Amwele
INSTRUCTIONS
1. Write clearly and neatly.
2. Number your answers clearly.
3. Make sure your student number appears on the answering script.
4. Include the formulas used for each calculation.
PERMISSIBLEMATERIALS
1. Calculator
THIS EXAMINATION QUESTION PAPERCONSISTSOF 3 PAGES(Excluding this front page)
1
|
|
2 Page 2 |
▲back to top |
Question 1
Name the 13 vegetation types of Namibia labelled in the map below {Fig. 1) ?
Fig.1
Question 2
Plant identification is important for a rangeland scientist. Below is a list of different plant
species that fall under different plant types or classes such as annual grasses, perennial
grasses, forbs(dicots), forbs (monocots), bushes and trees:
Acacia erio/oba, Anthephora pubescens, Cynodon dactylon, Boscia a/bitrunca,
Commelina benghalensis, Cleome gynandra, Schmidtia ka/ahariensis, Brachiaria
nigropedata, Tarchonanthus camphoratus, Aristida congesta,
21f>age
|
|
3 Page 3 |
▲back to top |
In the table below, rearrange the above-mentioned species into their respective
classes: annual grasses, perennial grasses, forbs(dicots), forbs (monocots), bushes
and trees:
An?:_~agl r.ciss~-s~te'.r_e;n'nJ.91 -,- · For_bs(di~ots.)·., Forbs
Bushes and
. ··
grasses ;,
· ,.., ·:.:.· .. ':',. - (mqri6cots) tre~s ·
[10]
Question 3
Whenever you are looking at a rangeland to assess its condition, it is always useful to look at
the nearest benchmark for comparison. Answer the following questions about establishing a
benchmark?
3.1 Which two factors should a benchmark normally be protected from?
(2)
3.2 Why should a benchmark have a gate?
(2)
3.3 What are two reasons why the shape of a benchmark is normally square?
(2)
3.4 Which two types of problem are likely to arise if a benchmark is too small,
i.e. less than 30 x 30 m
(2)
3.5 If, during a drought, you find some grasses dying in the benchmark due to lack of water,
would you irrigate them to keep them alive? Give the reasons for your answer
(2)
[10]
Question 4
4.1 Briefly explain the overall purpose of the restoration work that you participated in at
farm Krumhuk in March, in relation to the hydromorphic grassland.
(4)
Then explain the function of each of the following, in contributing to the overall purpose:
4.2 Suspension filters.
(2)
4.3 Diversion filters.
(2)
4.4 Road humps.
(2)
[10]
Question 5
Suppose that monitoring by a farmer shows that, in order to prevent over-
grazing, the maximum grazing period should not exceed 7 days under fast
growth and 28 days under slow growth. While the minimum rest period should
be at least 36 days under fast growth and 150 days under slow growth.
However, he can only afford to allocate four paddocks per herd of cattle.
Make use of a table, like that below, to show your figures:
3jf'age
|
|
4 Page 4 |
▲back to top |
Grazing
period
Based upon maximum
Based upon minimum rest
Fast growth Slow growth Fast growth Slow growth
Rest
period
IZI= correct timing IZ=I slight overgrazing IZIIZ=IIZdIestructive overgrazing
[8]
Question 6
Name and explain different methods used to construct and maintain fire breaks
(10]
Question 7
Drought occurs naturally in Namibia; the year 2013 was declared a drought year due to below
average rainfall received in most parts of the country. As an extension officer, you are asked
to put in place advanced management strategies in order to reduce the negative impact of a
drought. What would you advice the farmers in this regard.
[10]
Question 8
Name any five (5) fodder plants grown in Namibia for livestock production.
[5]
Question 9
Resting of rangelands can be achieved by herding or fencing.
9.1 Briefly explain the relative advantages and disadvantages of each.
(5)
9.2 Suggest two ways whereby you could lobby for the use of herding to be promoted. (4)
[9]
Question 10
Holistic management provides long rest with short grazing periods, whereas the grazing
strategy of Riaan Dames provides long rest with long grazing periods. Explain the differences
between the effects of these two grazing strategies on each of the following:
10.1 The abundance of dense patches of annual grasses
(5)
10.2 The vigour of perennial grasses
(5)
10.3 The growth rate of cattle
(5)
[15]
TOTAL: 100
41Page