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Bermuda grass (Cynodon dactylon) is a stoloniferous and
rhizomatous prostrate weed displaying high growth
rates under non-limiting conditions. Radiation has been
considered the major factor affecting C. dactylon patch
extension and biomass growth, but little is known about
the influence of water availability on those processes.
C. dactylon green area and biomass growth were
analysed in response to different soil water conditions.
Four experiments comprising eight drought treatments
were carried out during 2 years at different dates, to
generate a wide range of soil water and evaporative
demand conditions. Significant reductions in weed green
area and biomass growth were found between treatments
when low soil water conditions were imposed.
Reductions in green area were of greater magnitude than
reductions in biomass, suggesting a higher effect of
drought on green area increment. There were significant
(P < 0.05) relationships between green area increment
and cumulative incident radiation, although slopes
[relative green area growth rates (RGAGR)] differed
among treatments. A strong logistic relationship was
found between RGAGR and the ratio of plant-available
soil water to potential evapotranspiration. The
approach and parameters generated in this work can
be used to predict C. dactylon growth changes under
CitationAbelleyra, D. [et al.]. Soil water availability affects green area and biomass growth of Cynodon dactylon. "Weed research", Juny 2008, vol. 48, núm. 3, p. 248-256.
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