Pigeon pea for fallow improvement in slash-and-burn systems in the hills of Laos? |
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| Authors: | W Roder S Maniphone B Keoboulapha |
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| Institution: | (1) IRA/ICRAF Project, P.O. Box 2067, Yaounde, Cameroon |
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| Abstract: | Calliandra calothyrsus has been reported to have potential for agroforestry in the humid lowlands of West and Central Africa. Provenance evaluation
of the species was initiated in Yaounde, Cameroon with the objective of identifying adapted provenances with desirable traits
for inclusion in evaluation of the management of various agroforestry technologies being developed for the humid lowlands
of the region. Fifteen provenance seed collections from Central America and southeast Asian sources were included in the trial.
Results indicate that enormous genetic variation exists between these provenances. The highest yielding provenance produced
1.8 and 2.5 times, respectively, wood and leaf biomass compared to the lowest yielding provenance. Most of the provenances
evaluated flowered during the first six months after establishment while all the provenances (15) flowered by the end of the
first year. However, this initial flowering did not result in productive pod development and seed setting. Two years after
planting, the trees were cut at a height of 0.05 m above ground level, and more than 80% of the stumps of all the provenances
re-sprouted. Leaf nitrogen content ranged between 2.25% and 2.78% of dry weight. Six provenances had above average values
in at least five of the six desirable traits considered i.e.: height, growth, stem development, leaf biomass, wood biomass,
leaf litter productivity and total nitrogen content of leaves; these are recommended for further testing for inclusion in
appropriate technologies for soil fertility improvement.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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| Keywords: | acid soil biomass genetic variation phenology provenance soil fertility |
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