Bwa-yo - Société Audubon Haiti

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Figure 5.5 Natural regeneration ofS. glauca under a harvested mango tree, where birds
once perched and dropped seed after eating the sweet pulp.
Seed-coat dormancy can be overcome by extracting the kernel from the endocarp
or by cracking the endocarp prior to sowing (Timyan and Vaval, 1993). Both these treatments
showed significant improvements in germination over the control, increasing
total germination 2-fold in the nursery. Soaking the seed in either cold or hot (80 0
C)
water for 24 hours did not affect germination. However, height growth was slower for
seedlings that germinated from the extracted kernels than for the other seed treatments.
Growth Performance: Both species generally exhibit good to excellent survival, even
on poor sites with shallow soils and drought periods extending to 4 months (e.g.,
Bombard and Lapila). However, the species are out of their range on low-elevation sites
receiving less than J000 mm rainfall or sites above 900 m elevation (see Table 5.1 and
Table 5.2). Annual stcm increments are slightly higher for S. glauca than S. berteroana,
with the latter species exhibiting a more slender stem, less erect form, and branchier
crown.
Figure 5.6 S. glauca is propagated as bare-root seedlings in a CARE nursery.