Important Trees of Haiti

52 Kajou PeyieeeKajou Efranje
directly to the sun from shade, requiring acclimation to full-sunlight conditions.
Damping off and root-rot problems are the most serious nursery diseases and can be
controlled by proper watering and fungicide treatments. The root plug ofthe species is
loose and special precautions are required in lifting out the seedlings.
Growth Performance: The growth data on S. mahagoni in Haiti are surprisingly
sparse considering the widespread occurrence of the species (Table 6.1). It is more
drought hardy than S. macrophylla (Table 6.2) and generally exhibits higher survival
and growth on sites receiving less than 1000 mm rainfall. The trial at O'Gorman is typical
of the performance of S. mahagoni in Table 6.1 compared to S. macrophylla in
Table 6.2 on a dry site. Survival is 4-fold and mean annual diameter increments are 2fold.
.Even height growth is faster for the more drought-tolerant native species. On
favorable and wetter sites such as Fauche, growth ofS. macrophylla is rapid, achieving
twice the annual height increments of S. mahagoni. Whereas S. macrophylla can
achieve 2 m yr- 1 , S. mahagoni rarely grows faster than 1 m yr-l, even on sites where
moisture and soil depth are not limiting. Figure 6.8 and Figure 6.9 compare the height
Table 6.1 Site and growth parameters of S. mahagoni trials in Haiti.
SITE ELEVATION ANNUAL AGE SURVIVAL HEIGHT DBH 2
(m) RAINFALL (yr) (%) M.A.!.1 M.A.I.
(rom) (m) (em)
Fauche 5 1436 3.0 84 1.4 1.4
Marmont 280 1450 3.0 71 1.2 1.2
Marmont 280 1450 3.0 44 1.0 0.9
Roche Blanche 130 1030 3.0 48 1.1 1.2
Terrier Rouge 20 1293 3.0 71 0.6 0.3
O'Gorman 70 830 9.0 85 0.6 0.6
Vaudreuil 55 830 10.0 89 0.8 1.1
1M.A.I. =Mean annual increment. 2 DBH =Stem diameter at 1.3 m above ground level, in em.
Table 6.2 Site and growth parameters of S. macrophylla trials in Haiti.
SITE ELEVATION ANNUAL AGE SURVIVAL HEIGHT DBW
(m) RAINFALL (yr) (%) M.A.I. 1 M.A.I.
(mm) (m) (em)
Berault 25 1950 3.0 53 2.0 2.2
Labordette 375 1350 3.0 44 0.6 1.0
Fauch- 5 1436 3.0 47 2.2 2.1
Marmont 280 1450 3.0 32 1.4 1.5
Marmont 280 1450 3.0 44 1.0 1.0
Roche Blanche 130 1030 3.0 30 1.0 1.0
O'Gorman 70 830 5.3 22 0.4 0.3
Vaudreuil 55 830 10.0 75 1.0 1.2
1M.A.I. =Mean annual increment. 2 DBH =Stem diameter at 1.3 m above ground level, in em.