Abstract:
The study on the comparison of seedling growth of Okoumé (Aucoumea klaineana Pierre) in
nursery compared to harvested seedlings (wild plants) in dense forest in Africa takes place at the
Nursery of Youbi, a locality located in the department of Kouilou in the Republic of Congo.
Initially, eight hundred seeds of Okoume (Aucoumea klaineana Pierre) had undergone a direct
germination test in the same nursery, then we made a selection of thirty (30) seedlings that
should constitute the transplanting device in lute with the thirty (30) other seedlings (wildlings)
from harvests in natural forest.
In both cases, the work equipment was the same. The transplants in the field should have the
same correspondences, therefore the same parameters. The observations were made as well as
the measurements. During the treatment of the results, we noticed some differences of growth in
both cases, in particular in the follow-up of the development of the plants (average height of the
stem). In seedlings, we found an increase of 11 cm in 12 weeks with an average growth rate of
8.3%; the curves are stationary during the first two weeks as in the other case, along the
experiment we have a broken line curve but here we see a slight growth rate of 9.22 cm.
The average number of leaves in 12 weeks showed that seedlings and wild plants produced an
average of 6 leaves.
In the case of the length and the growth of the leaves, it appears that the growth, whatever the
seedling or the wild, it is synchronized. Leaves do not develop in the same way in both seedlings
and wild plants. The average number of nodes, for example, has been observed, a production of
nodes similar to that of the leaf production at the level of the seedlings whereas in the wild, the
pace reflects that of the average number of leaves, but it differs with the first two weeks when it
remains stationary. The rate of increase of the leaf area remains as insignificant as 16.15 cm2 for
seedlings and 17.52 cm2 for wildlings. This competition should be applied in the majority of
nurseries of the National Reforestation Service (SNR) in order to choose plants with good
behavior before transplanting into the forest.
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