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Table 6.4
Crop transpiration eficiency factor
μ
(Eq.
6.35
) for various C
3
and C
4
crops
Crop
Type of CO
2
ixation
μ
(Pa)
Sorghum
C
4
13.8
Maize
C
4
7.4-10.2
Wheat
C
3
3.1-6.2
Barley
C
3
4.0
Oat
C
3
2.9-4.2
Potato
C
3
5.9-6.5
Lucerne
C
3
4.3
Soybean
C
3
4.0
Pea
C
3
3.8
Fava bean
C
3
3.1
From Ehlers and Goss (
2003
).
60
C
4
plants
Maize, sorghum, sugar cane
50
Efficient C
3
plants
Soybean, cotton, lucerne
40
30
Less efficient C
3
plants
Tobacco, red clover, cock's-foot grass
20
C
3
plants, growing in shade
lvy, philodendron, monstera
10
0
-10
0
20
40
Radiation (% of full sunlight)
60
80
100
Figure 6.18
Idealized light response curves for leaves of different plant species.
The dashed horizontal line marks the light compensation point LCP, where the CO
2
uptake rate due to photosynthesis is the same as the CO
2
release rate from respiration.
(After Gardner et al., 1985).
of growth. The curve was developed for sugar cane in Hawaii, but shows a similar
pattern at other crops. Kirkham (
2005
) summarizes moisture-sensitive periods for
selected crops during which a water deicit depresses the economic yield much more
than other periods.
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