Fall 2002:
Do You Know This About Magnesium? |
1. In plant nutrition, magnesium (Mg) is a(n) _____.
A.
Macronutrient
B.
Micronutrient
C.
Nanonutrient |
2. Let's see who the plant chemistry pro is? Each molecule of chlorophyll
contains ______ Mg.
A.
0.5%
B.
2.3 %
C.
6.7% |
3. Which nutrient is dependent on Mg for uptake in plants?
A.
Arsenic
B.
Phosphorous
C.
Einsteinium |
4. Mg plays a role in which of the following plant metabolic functions?
A.
Enzyme activation
B.
Protein synthesis
C.
Cell division
D.
All of the above |
5. You've just gotten back your soil test report. Soil Mg levels
are below 35 lb/acre. Did your soil make the grade or fail miserably?
A.
A+
B.
C-
C.
F |
6. The Earth's crust contains roughly _____ Mg.
A.
2%
B.
73%
C.
87% |
7. Below a soil pH of _____, Mg can become a limiting factor in plant
growth.
A.
2.0
B.
4.2
C.
5.8 |
8. Adding high Ca limestone to soil can _____ Mg deficiencies.
A.
Postpone
B.
Promote |
9. Take a walk on the wild side! Which of these describes serpentine
soils?
A.
Home to Puff the Magic Dragon
B.
A good refuge for reptiles
C.
Supplied with excessive amounts of Mg |
10. For soils with a good soil nutrient exchange, a desirable ratio
of soil Ca to Mg is about _____.
A.
1000 to 1
B.
1,000,000,000 to 1
C.
10 to 1 |
11. The primary losses of soil Mg and Ca are by:
A.
Leaching
B.
Erosion
C.
Plant removal |
12. Where are Mg deficiencies most likely to occur first?
A.
In new leaf growth
B.
In old leaf growth
C.
In seed |
13. Excessive applications of which nutrients can induce Mg deficiencies?
A.
Calcium
B.
Potassium
C.
Ammonium
D.
All of the above |
14. Which region would be most susceptible to losses of Mg, Ca, and
K?
A.
Regions of high precipitation, such as Washington
B.
Dry, desert country, such as New Mexico
C.
Permafrost soils of Alaska |
15. Which of these is NOT a symptom of Mg deficiency?
A.
Loss of color between leaf veins
B.
Thin, brittle leaves that curve upward
C.
Reddish-purple tips and edges of leaves
D.
Blue and yellow fuzz on leaves |
