Rubber production and, more significantly, growth are both dependent on the stimulation of the latex-producing metabolism. Is it possible to boost yield without using exogenous hormones by activating the latex-producing metabolism of the rubber tree? Many studies were carried out over a nine-year period in Southern Côte d'Ivoire on 15 clones (IRCA 18, IRCA 209, IRCA 111, IRCA 130, PB 235, PB 260, PB 280, PB 330, PB 310; GT 1, BPM 24, RRIC 100; PB 217 and PR 107) of the active, moderate, and slow metabolisms, respectively, using two main statistical designs. On a modest scale, in a "one-tree plot" design, the same latex collecting device was used for all treatments, tapping in d4 with different hormonal stimulation regimens (0/y; 2/y; 4/y; 6/y; 8/y; 13/y; 18/y; 26/y, 39/y, and 78/y). Various tapping frequencies (d2, d3, d4, d5, and d6) as well as hormonal stimulation (0/y, 4/y, 8/y, and 10/y) were used in a randomised full block design. The mean g.t-1.t-1 of the unstimulated control (56) of the active metabolism clones (PB 235, PB 310, IRCA 111, and IRCA 130) over 9 years was done statistically in the same sequence as the stimulated patterns, regardless of the stimulation regime (54). The control (60) had a lower average g.t-1.t-1 than the clones with the highest producing stimulation patterns (67). (PB 330, PB 280, PB 260, IRCA 18 and IRCA 209). The unstimulated control's mean g.t-1.t-1 was significantly lower (49) than the highest yielding stimulated treatment (57) of moderate metabolism clones (GT 1, BPM 24 and RRIC 100). The unstimulated control's mean g.t-1.t-1 was much lower (39) than the most yielding stimulated treatment (70) of slow metabolism clones (PB 217 and PR 107). The unstimulated latex harvesting system (d2 0/y) revealed an average outcome of (2341; 2266 and 1849 kg.ha-1.year-1 for the active, moderate, and slow metabolisms, respectively) statistically comparable to those of the highest yielding tapping frequencies d3, d4, d5, and d6 for all latex harvesting systems combined for the clones studied on a large scale and at tapping frequency (d2) for the active, moderate, and slow metabolisms (2388; 2348 and 2256 kg.ha- 1.year-1). These findings show that natural rubber can be created without the use of exogenous hormone stimulation by deliberately controlling tapping intensity.
Author(S) Details
Obouayeba Samuel
Centre National de Recherche Agronomique (CNRA), Laboratoire d’Agrophysiologie Végétale, Programme Hévéa, Station de Bimbresso, 01 BP-1536 Abidjan, Côte d’Ivoire.
Diarrassouba Moussa
Ecole Nationale Supérieure d’Abidjan, Physiologie Végétales, 08 BP 10 Abidjan 08, Côte d’Ivoire.
Konan Djézou
Centre National de Recherche Agronomique (CNRA), Laboratoire d’Agrophysiologie Végétale, Programme Hévéa, Station de Bimbresso, 01 BP-1536 Abidjan, Côte d’Ivoire.
Obouayeba Abba Pacôme
Université Jean Lorougnon Guédé, UFR Agroforesterie, Laboratoire de Physiologie et Pathologie Végétale, BP 150 Daloa, Côte d’Ivoire.
Soumahin Eric Francis
Université Jean Lorougnon Guédé, UFR Agroforesterie, Laboratoire de Physiologie et Pathologie Végétale, BP 150 Daloa, Côte d’Ivoire.
Koffi Antoine
Université Jean Lorougnon Guédé, UFR Agroforesterie, Laboratoire de Physiologie et Pathologie Végétale, BP 150 Daloa, Côte d’Ivoire.
Adou Bini Christophe
Centre National de Recherche Agronomique (CNRA), Laboratoire d’Agrophysiologie Végétale, Programme Hévéa, Station de Bimbresso, 01 BP-1536 Abidjan, Côte d’Ivoire.
Ballo Espérance Kouadio
Université Jean Lorougnon Guédé, UFR Agroforesterie, Laboratoire de Physiologie et Pathologie Végétale, BP 150 Daloa, Côte d’Ivoire.
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