The study examined the benefits of upward tapping over
downward tapping for agro-physiological reasons in rubber clones GT 1 and PB
260 in Southwest Côte d'Ivoire. It was discovered that, in comparison to
downward tapping, upward tapping increased rubber productivity by 35% for GT 1
and 37% for PB 260 clones. Regardless of the tapping direction, the examination
of physiological parameters revealed that both clones had high dry rubber
contents, indicating efficient latex regeneration during tapping. Regardless of
the clone and tapping mechanism, the study also discovered that the
physiological profiles of the trees and the dryness of the tapping panel were
in good balance. The downward tapping on the virgin bark of the lower panel
(BO) is immediately followed by the upward tapping on the virgin bark of the
upper panel (HO), consecutively. To determine the agro-physiological advantages
of one tapping over another, a study of the downward and upward tapping of the
GT 1 and PB 260 clones of Hevea brasiliensis was carried out in southwestern
Côte d'Ivoire. For this purpose, the rubber trees were tapped in a downward
half-spiral (S/2) at the opening for nine consecutive years, followed by upward
quarter-spiral tapping (S/4U) for four consecutive years. The agronomic
parameters (rubber production and vegetative growth), tapping panel dryness and
the latex micro-diagnosis, were evaluated. For the GT 1 clone, the transition
from the downward tapping panels to the upward tapping panels resulted rubber
productivity gain of 35%. Meanwhile for PB 260, rubber productivity gain was
37%. The isodiametric development of the tree trunk was found to decrease with
increasing rubber production of a corresponding tapping panel, regardless of
the clone and tapping direction. The combination of latex harvesting
technologies and clones had no effect on the physiological profile of the trees
or the dryness of the tapping panel. In summary, upward tapping yields higher
productivity than downward tapping; nonetheless, the clone determines how much
more rubber may be produced.
Author(s)details:-
A. P. Moro
Nangui Abrogoua University, UFR of Natural Sciences, Laboratory of Biology
and Improvement of Plant Production, BP 801 Abidjan 02, Ivory Coast.
B. Y. C. Adou
National Center for Agronomic Research (CNRA), Plant Agrophysiology
Laboratory, Hevea Program, Bimbresso Station, 01 BP 1536 Abidjan, Ivory Coast.
M. Diarrassouba
Ecole Nationale Supérieure d’Abidjan, Plant Physiology, 08 BP 10 Abidjan
08, Ivory Coast.
D. Konan
National Center for Agronomic Research (CNRA), Plant Agrophysiology
Laboratory, Hevea Program, Bimbresso Station, 01 BP 1536 Abidjan, Ivory Coast.
E. F. Soumahin
Jean Lorougnon Guédé University, UFR Agroforestry, Plant Physiology and
Pathology Laboratory, BP 150 Daloa, Ivory Coast.
T. H. Kouakou
Nangui Abrogoua University, UFR of Natural Sciences, Laboratory of Biology
and Improvement of Plant Production, BP 801 Abidjan 02, Ivory Coast.
S. Obouayeba
National Center for Agronomic Research (CNRA), Plant Agrophysiology Laboratory,
Hevea Program, Bimbresso Station, 01 BP 1536 Abidjan, Ivory Coast.
Please See the book
here :- https://doi.org/10.9734/bpi/racas/v9/134
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