Browsing by Author "Sileye, T."

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    Coconut Carbon Sequestration Part 1 / Highlights on Carbon Cycle in Coconut Plantations
    (2008) Roupsard, O.; Lamanda, N.; Jourdan, C.; Navarro, M.N.V.; Mialet Serra, I.; Dauzat, J.; Sileye, T.
    This article reviews scientific information in order to prepare application of coconut plantations to the Clean Development Mechanism CDM of the Kyoto Protocol. It sums up some theories for describing the C cycle within a given plantation, separating the coconut trees, the under-storey and the soil. It synthesizes recent reports about the C cycle (stocks and fluxes) of a chronosequence of coconut plantations, considered to be a reference for productivity (high level of fertility, no drought). It gives figures for the potential C balance of a coconut plantation and compares them to other tropical humid evergreen forests. Although the results should not be extrapolated without caution, they highlight some main traits of this peculiar crop, such as a high productivity and a large C allocation into organs display ing rapid turnover (bunches of fruits, fine roots, leaves, peduncle and spikelets), the fate of which is to be turned into litter. Moreover, results bring new insights into the physiology of this plant, which is of high interest for understanding the components of yield, such as reserve dynamics. They also confirm that litter management is crucial for the C fixation and the sustainability of coconut cultivation, especially when the levels of inputs are low.
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    Preliminary Results on the Production of Heart of Coconut in Vanuatu. Effect of the Planting Density on the Yield
    (2009) Labouisse, J.P.; Sileye, T.; Hamelin, C.; Bonneau, X.; Rouziere, A.
    This article presents the results of a field experiment on the production of heart of coconut (HOC) in Santo Island, Vanuatu. It demonstrated that the production of HOC is possible under the conditions of northern Vanuatu without irrigation and with low inputs. Only sodium chloride was applied as a fertiliser and the use of scrap copra sacks as a mulch was proved particularly efficient to reduce the weeds invasion and to preserve moisture. In this experiments, 3 densities of planting in an equilateral pattern with a spacing of 0.8 m, 1.4 m and 2.0 m were tested, and the growth parameters of the seedlings and the yield of the final product over a period of 2 years were recorded. It appeared that the higher the density of planting, the lower the weight of each HOC and the higher the yield by area unit. Two years after planting, the yield of HOC was 11.8 MT/hectare (0.8 m spacing), 7.7 MT/hectare (1.4 m) and 6.4 MT/hectare (2.0 m) with an average weight of HOC of 688 g, 1372 g and 2330 g respectively. The market requirement for HOC individual weight must be taken into account to choose the appropriate spacing and duration of cultivation. A strong relation between the stem girth and the HOC weight that can be described in the form of an allometric equation makes easy to estimate at any time the potential yield of HOC by measuring the stem girth of the whole palm.