Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1572-9680
    Keywords: Ca ; Cordia alliodora ; Erythrina poeppigiana ; evaporation ; interception ; K ; Mg ; N ; P ; shade trees ; Theobroma cacao ; transpiration ; water balances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The hydrological balances for the agroforestry systems of Theobroma cacao with Cordia alliodora or Erythrina poeppigiana were calculated using measurements taken over four years (1983–1987) of the following parameters: climatic (precipitation, evaporation); edaphological (texture, soil moisture tension, hydraulic conductivity, variations in soil moisture content). Water fluxes (interception, simulation of transpiration and percolation) were estimated from one year of measurements (1986–1987). Weekly samples of percolated water were taken from March 1986 – March 1987 using lysimetric capsules at 100 cm soil depth. N, P, K, Ca and Mg concentrations were determined to calculate the annual leaching losses. Nutrient concentration values were extrapolated for the whole 4 years observation period, in order to calculate leaching losses for the whole study period. Precipitation samples were also taken to determine the corresponding annual nutrient inputs.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1572-9680
    Keywords: Agroforestry ; biomass ; cocoa yield ; Cordia alliodora ; Erythrina poeppigiana ; litter production ; organic material ; shade trees ; sustainability ; timber production ; Theobroma cacao
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Predictive models were developed for Cordia alliodora branch and Theobroma cacao branch or leaf biomass,based on branch basal areas (r2 ⩾ 0.79) but the model of C. alliodora leaf biomass, although significant, was of very low accuracy (r2 = 0.09) due to annual leaf fall. At age 10 years, shade tree stem biomass accounted for 80% of the total above-ground biomass of either tree. However, between the ages of 6 and 10 years, the biomass increment of T. cacao branches (3–4t.ha−1.a−1) was similar to that of the shade tree stems. During the same period, the net primary productivity was 35 and 28 t.ha−1.a−1, for the Erythrina poepigiana and and C. alliodora systems, respectively. Cocoa production under either of the shade trees C. alliodora or E. poeppigiana was 1000 kg.ha−1.a−1 (oven-dry; ages 6–10 yr). During the same period, C. alliodora timber production was 9 m3.ha−1.a−1 whilst the leguminous shade tree E. poeppigiana does not produce timber. Litterfall over the same 5 years, including crop and/or shade tree pruning residues, averages 11 and 23 t.ha−1.a−1, respectively. The main difference was due to E. poeppigiana pruning residues (10t.ha−1.a−1). Soil organic material reserves (0–45 cm) increased over 10 years from 198 to 240 t.ha−1 in the E. poeppigiana plots and from 168–184 t.ha−1 in the C. alliodora plots. These values, together with the productivity indices presented, provide evidence that the systems are sustainable. For economic reasons, the use of C. alliodora is recommended under the experimental conditions. however, on less fertile soils without fertilization, the greater biomass and hence nutrient return to the soil surface under E. poeppigiana, might make this the preferable shade tree.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...