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Buffel grass (Cenchrus ciliaris)
growth, biomass allocation to root and shoot, water use efficiency and
photosynthetic activity were measured in response to two defoliation heights
(5 and 3 cm). Results showed that plants clipped at 5 cm showed a significant
increase of diameter and water use efficiency as well as higher leaf water
potential with a subsequent increase of stomatal conductance and photosynthetic
activity. On the other hand, plants clipped at 3 cm presented an increase
in photosynthetic activity parameters but a significant decrease in all
growth parameters and water use efficiency.
