Agriculture Reference
In-Depth Information
Harvest (16 weeks)
12 weeks old
3 weeks old
gm
kg/ha
3000
cm
cm
100
200
20
50
80
6
2000
60
30
4
100
10
40
1000
2
20
10
0
Number of
leaves per
plant
mean
height of
plants
Number of
leaves per
plant
mean
height of
plants
Yield per
plants
To t a l
yield
Area of dense bittergrass
Area free of bittergrass
FIGURE 11.4
Allelopathic inhibition of corn by bitter grass (Paspalum conjugatum), Tabasco, Mexico.
Rain washes
phytotoxins off of dead and living parts of the grass, and additional compounds are exuded from the roots. (Data from Gliessman
S.R. In A. Amador ed.,
Memoirs of Seminar Series of Ecology
. pp. 1-8. Colegio Superior de Agricultura Tropical: Cardenas,
Tabasco, Mexico. 1979.)
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