Assessment of hedgerow species for seed size, stand establishment and seedling height
- 55 Downloads
The relationships between seed size, emergence, stand establishment and seedling height were examined in a trial comparing tree and shrub species as hedgerows for alley cropping in four environments in Haiti. Logarithmic functions relating % emergence, % stand establishment and seedling height to seed weight were positive and significant. These relationships were stronger when species weighing > 10 g 100−1 seed were excluded from the analysis. Higher R2 values were obtained regressing % stand than regressing % emergence on seed weight. Although exceptions were noted, a majority of species having seed weights between 2.5 g and 10 g 100−1 had good stands. Establishment was poor or inconsistent for species with seed < 2.5 g 100−1. The effect of seed size on height was more important for seed weights < 5 or 8.8 g 100−1, depending upon the site, than for larger seed. Species with < 2.5 g 100−1 seed are unsuitable for direct seeding where the chance of drought is high.
Key wordsagro-ecological zones alley cropping emergence Haiti trees
Unable to display preview. Download preview PDF.
- Brook RM, Kanua MB and Woruba MG (1992). Multipurpose tree species evaluations in Papua New Guinea: early results. Nitrogen Fixing Tree Res Rep 10: 77–80Google Scholar
- Guthrie RL, Isaac L, Alexis G, Bernard C and Blemur M (1995) Soil profile descriptions for research sites in Haiti. SECID/Auburn PLUS Report No. 29. South-East Consortium for International Development and Auburn University, Petionville, Haiti. USAID, HaitiGoogle Scholar
- Harper JL (1977) Population Biology of Plants. Academic Press, London, 892 ppGoogle Scholar
- Lantagne DO (1980) Tree species selection for reforestation of the Jean Rabel area of Northwest Haiti. MS Thesis. Virginia Polytechnic Institute and State University, Blacksburg, VAGoogle Scholar
- Leishman MR and Westoby M (1994) The role of seed size in seedling establishment in dry soil conditions —experimental evidence from semi-arid species. J Ecol 82: 249–258Google Scholar
- Organization of American States (1972) Ecologie, République d'Haiti. Map, 1:500,000. Washington, DCGoogle Scholar
- Osunkoya OO, Ash JE, Hopkins MS and Graham AW (1994) Influence of seed size and seedling ecological attributes on shade-tolerance of rain-forest tree species in northern Queensland. J Ecol 82: 149–163Google Scholar
- Qiu J and Mosjidis JA (1993) Genotype and planting depth effects on seedling vigor in sericea lespedeza. J Range Manage 46: 309–312Google Scholar
- Timyan JC (1993) Status of seed orchards and tree improvement trials in Haiti and Plan of Activities 1993–1994. SECID/Auburn PLUS Report No. 1. USAID, Haiti, 72 ppGoogle Scholar