Cost benefit analysis for Grevillea robusta in Ethiopia: linking establishment of a breeding seedling orchard to the economic returns of quality plantings

Abstract

References AppendicesAppendix I Appendix II iv List of Tables in main text1. Summary of trials and genetic variability studies on grevillea. Entries are organised alphabetically by first author of the study and then date of publication 2. Sites IDs assigned to three quality scenarios for assessed grevillea planting 3. Assumptions used for different planting options when estimating contribution margins 4. Summary of costs over a single cycle of production for grevillea planting options and quality scenarios 5. Summary of NPV, IRR and EAC values over a single cycle of production for grevillea planting options and quality scenarios 6. Summary of mean annual increments over a single cycle of production for grevillea planting options and quality scenarios List of Figures1. A Grevillea robusta plantation in Masinagudi, India (Creative Commons Attribution-Share Alike 4.0 International license, "Masinagudi Habitat -Silver Oak Grevillea robusta Plantation" by P. Jeganathan) 2. Modelled predicted growth of grevillea for unique IDs (sites, coloured lines) and for the general data pool (black line). Figures A and B show predictions for tree height and DBH, respectively 3. Growth curves of height (A) and DBH (B) fitted to data segregated by three quality scenarios (AY = actual yield, CYG = closing yield gap, PY = potential yield), with derived profiles of aboveground biomass (C, AGB) and under-bark volume (D, V u ) 4. A tree-map where BSO establishment costs are represented. Different squares areproportional in area to specific costs 5. Cumulative NPV (Birr ha-1) for grevillea for the planting options of agroforestry and woodlots and three quality scenarios. Note the difference in x-axis scaling between quality scenarios, reflecting the different lengths of a single production cycle (long, intermediate and short for AY, CYG and PY, respectively) 6. The difference in cumulative NPV nationally between each of the CYG and PY quality scenarios and the business-as-usual AY scenario, based on the establishment of a grevillea BSO in year 1. The vertical lines indicate when the cumulative NPV shifts from negative to positive for both comparisons. The grey profile corresponds to an average level of tree improvement between CYG and PY scenarios 7. Mean Annual Increment for AGB (t ha -1 y -1 ) and V u (m 3 ha -1 y -1 ) over time for grevillea production for agroforestry and woodlot planting options and three quality scenarios. The y-axis reflects one production cycle which varies in length for the quality scenario v