Term
If there is stagnant flooding (abrupt rise) in a rice cultivation system the safety mechanism is:
a) elongation
b) submergence
c)fast emergence |
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Definition
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Term
Why is cotton so susceptible to weed competition?
a) in the first stages of its growth it puts its energy into growing its tap root
b) It doesn't attain full cover until later on in its life cycle making it unable to shade out competing plants
c) it is indeterminate
d) a) & b) |
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Definition
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Term
Why is cotton so susceptible to pests?
a)it isn't
b)because of its potential indeterminate growth
c)because of its potential determinant growth |
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Definition
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Term
A pest is classified as this host range if it feeds on exclusively one species:
a)monophagous
b)oligophageous
c)polyphageous |
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Definition
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Term
What does it mean if a pest has the ability to enter facultative diapause?
a) that it can enter a state of increased fecundity
b)it enters a state of over wintering
c) it enters a state which helps it survive periods of low host availability |
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Definition
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Term
Mites, aphids & thrips attack cotton at this stage of growth:
a)late maturing bolls
b)peak formation of squares
c)small buds to near mature bolls |
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Definition
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Term
G. hirsutum in general:
a) is drought resistance but has a shorter staple
b) has a longer staple but needs more water
c)is good for good conditions
d) a) & c) |
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Definition
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Term
Cotton ecophysiology
a) optimal mean temperature of 34 degrees
b) needs a wet period of 150-170 days
c) needs 200 FFD
d) optimal rain fall 500mm |
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Definition
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Term
Cotton growth stages, which is the correct duration for the correct stage?
a) sowing to flowering 60 days
b) ascending phase to flowering 30 days
c) growth of bolls from peak flowering 30 days
d) total time requiring water 120 days
e) maturing of bolls 30 - 50 days
f) all of the above |
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Definition
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Term
Which branch(es) on the cotton plant have a straight growth habit?
a)main stem
b)fruiting branch
c)vegetative branch
d) a) & c) |
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Definition
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Term
When does the cotton plant stop growing?
a) at flowering
b) after tap root establishment
c)when the top bloom is within 5 nodes of the top of the plant |
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Definition
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Term
When is fertilizer applied to the cotton plant?
a) after germination & after first flowering
b) before sowing, before first flowering & during continuous picking
c) after germination, before first flowering & during continuous picking |
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Definition
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Term
Cotton originated:
a) India
b) Asia & Pre Columbian Americas
c) Columbian Central & South America |
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Definition
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Term
Which species of cotton is the most prevalent in cotton production today?
a)Gossypium aboreum
b)Gossypium herbaceum
c)Gossypium hirsutum
d)Gossipium barbadense |
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Definition
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Term
Which match the characteristics of the rice cultivator indica?
a) tropical
b) sub tropical & photo period insensitive (allows 2 - 3 crops per year)
c) sub tropical & photo period sensitive |
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Definition
| a) tropical (just a note it also is photo-period sensitive and is derived from the indicas) |
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Term
Which set of conditions is optimal for rice growth?
a) 10-18 degrees C, 800 mm,
b) 30 - 32 degrees C , 800 mm
c) 30-32 degrees C, 1200 - 1500 mm |
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Definition
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Term
Which best describes an irrigated rice production system?
a) level fields with water control, rice is planted directly into puddle shallow water with anaerobic soil during growth
b) level to sloping depressed fields, more than 10 consecutive days of medium to deep flooding
c) level to slightly sloping fields, submergence doesn't exceed 50cm for more than 10 consecutive
d)level to slightly sloping fields, rarely flooded |
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Definition
a)
[note b) is flood prone, c) is rain-fed lowland and d) is upland. More specific characteristics such as ploughing on slide 11] |
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Term
Which features are characteristic of the Japonica cultivar of rice?
a)long vegetative period, susceptible to lodging & poor response to fertilizer
b)moderate tolerance to unfavourable conditions, good fertilizer response
c)"short and fat"
d)"tall and skinny"
e) b) & c) |
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Definition
c)
[note, all other characteristics are those of indica] |
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Term
Differences in the growth duration of rice are caused by:
a) different rates of germination
b) different lengths in reproduction & ripening phases
c) different lengths in the vegetative phase |
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Definition
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Term
| Stages of Irrigation production in rice: |
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Definition
| primary tillage with plough, secondary tillage with off-set disc,puddling, levelling.planting (transplant/direct seed), weeding by hand, drain and herbicide application, then re-flooding, mostly harvesting by hand and not combine, threshing is done by hand or with a machine |
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Term
Why are there restrictions on irrigation schemes handling the frequency of production?
a) c) & d)
b)its the law
c)weed build up prevention
d)conservation of water |
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Definition
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Term
Which upland rice production system involves clearing of natural vegetation & intercroping & planting at low density?
a)shifting system
b)pioneer system
c)fixed system |
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Definition
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Term
Which progression bellow is correct:
a)LGP increases Northern Guinea---> Sudan--->Sahel
b)as rainfall increases the order of cropping is: millet---> sorghum ---> maize
c)as you move north, the LGP increases |
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Definition
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Term
Why are there different varieties of Sorghum that have different growth durations?
a)To ensure a crop because the rainfall is not predictable. Early ripening varieties are "insurance".
b)For adaptability in the different zones of the west savana.
c)for genetic variation. |
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Definition
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Term
Which crop(s), based on water requirements, would not be be grown in the Sahel Savana?
a) cassava
b)millet
c)ground nut
d) a) & c) |
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Definition
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