Dry matter production in an association of Cenchrus ciliaris - Leucaena leucocephala subjected to a deferring use during the dry season
2008
In a semi-arid region in western Venezuela at Zulia state, we studied
the effect of four periods of deferment of use (PDU: 42, 84, 126, and
168 days) after the first cut on the accumulation of biomass in an
association of buffel grass ( Cenchrus ciliaris ) and Leucaena (
Leucaena leucocephala ), estimating production of its components in
the grass (leaves, stems, and dead material) and the legume fine
fraction (leaves, leaf stalk, and stems with diameter less than 5 mm)
and thick fraction (stems with diameter above 5 mm). Plant samples were
taken at three strata for buffel (0-15, 15-30, and > 30 cm) and
leucaena (0-60, 60-120, and > 120 cm). After every PDU cut, plots
were harvested every 42 days to evaluate regrowth. A randomized block
experimental design with three replicates was used. Results indicated
yields for both species with values of 1,146 and 1,925 kg DM/ha for
buffel and leucaena, respectively. There were found differences among
treatments (P>0.05) only on the legume being the best PDU 42 and 0
days. The highest leaf proportion and the lowest dead material content
(P<0.05) for the grass was found on the upper layer. Meanwhile,
leucaena highest values of fine fraction was found on the medium layer.
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