Latex micro diagnosis, modern management tool of rubber plantations of clones with moderate metabolism GT 1, RRIC 100 and BPM 24

Objective: The cultivated rubber clones are sensitive to latex harvesting regimes according to their laticiferous metabolism. This study was done to determine the best latex harvesting system (s) of clones with moderate metabolism (GT 1, RRIC 100 and BPM 24).Methodology and Results: Six latex harvesting technologies were  applied to these clones in a bulk statistical device from Fisher to four rehearsals. The rubber trees were tapped in downward half spiral stimulated or not, for nine years after the opening of the tapping panel. The agronomic parameters (latex production, vegetative growth), the tapping panel dryness and those of the latex micro diagnosis were  evaluated. The results indicate that these clones independently of the latex harvesting system have good rubber productivity (2234 kg.ha-1.y-1) with good radial vegetative growth (2.4 cm.y-1). Their trees showed a well-balanced physiological profile and an acceptable sensitivity to the tapping panel dryness (3.2 %). However, the physiological index, the bark consumption and the sensitivity to the tapping panel dryness lead to retain the latex harvesting technology "S/2 d4 6d/7 Pa1 (1) ET2.5% 4/y” for the best.Conclusion and application of results: This index, favourably  influencing the choice of technologies adapted to clones with active metabolism, contributes to the modern and efficient management of a rubber plantation.Key words: latex-harvesting technology, rubber clones, moderate  metabolism, tapping panel dryness, physiological parameter

Contribution of Latex Micro Diagnosis to Modern Management of Rubber Plantations: Case of Clones With Low or Slow Metabolism PB 217 and PR 107

The cultivated rubber clones are sensitive to latex harvesting regimes according to their laticiferous metabolism. Thus, in order to determine the best latex harvesting systems of clones with low or slow metabolism, six latex harvesting technologies are applied to them in a bulk statistical device from Fisher to four rehearsals. The rubber is tapped in downward half spiral stimulated or not for nine years after the opening of the tapping panel. The agronomic parameters (production, vegetative growth), the tapping panel dryness and those of the latex micro diagnosis were evaluated. The results indicate that these clones independently of the latex harvesting system have good rubber productivity (2310 kg.ha -1 .y-1 ) with good radial vegetative growth (2.9 cm.y -1 ). Their trees show a well-balanced physiological profile and an acceptable sensitivity to the tapping panel dryness (4.9%). However, the physiological index, the bark consumption and the sensitivity to the tapping panel dryness lead to retain the latex harvesting technologies "S/2 d3 6d/7 Pa1(1) ET2.5% 4/y, S/2 d4 6d/7 Pa1(1) ET2.5% 4/y and S/2 d4 6d/7 Pa1(1) ET2.5% 8/y” for the best. This index, favorably influencing the choice of technologies adapted to clones with active metabolism, contributes to the modern and efficient management of a rubber plantation

Latex Micro Diagnosis, Modern Management Tool of Rubber Plantations of Clones With Active or Rapid Metabolism IRCA 18, IRCA 130, PB 235, PB 260 and PB 330

The cultivated rubber clones are sensitive to latex harvesting regimes according to their laticiferous metabolism. Thus, in order to determine the best latex harvesting systems of clones with active or rapid metabolism (IRCA 18, IRCA 130, PB 235, PB 260 and PB 330), six latex harvesting technologies are applied to them in a bulk statistical device from Fisher to four rehearsals. The rubber is tapped in downward half spiral stimulated or not for nine years after the opening of the tapping panel. The agronomic parameters (production, vegetative growth), the tapping panel dryness and those of the latex micro diagnosis were evaluated. The results indicate that these clones independently of the latex harvesting system have good rubber productivity (2310 kg.ha -1.y1) with good radial vegetative growth (2.9 cm.y-1). Their trees show a wellbalanced physiological profile and an acceptable sensitivity to the tapping panel dryness (4.9%). However, the physiological index, the bark consumption and the sensitivity to the tapping panel dryness lead to retain the latex harvesting technologies “ S/2 d3 6d/7 Pa1(1) ET2.5% 4/y and S/2 d4 6d/7 Pa1(1) ET2.5% 4/y ” for the best. This index, favorably influencing the choice of technologies adapted to clones with active metabolism, contributes to the modern and efficient management of a rubber plantation

Effect of design and planting density on the agrophysiological parameters of clone GT 1 Hevea brasiliensis Muell Arg in southwestern Côte d'Ivoire

The design and planting density can influence certain agronomic  parameters. To enable Hevea brasiliensis clone GT1 to better express their agrophysiological potentialities and sensitivity to the tapping panel dryness a study, of the design and planting density was undertaken at the SCASO experimental site in southwestern of Ivory Coast. The experimental design applied, split-plot of three treatments (designs in lines separated from 6 or 7 m and staggered) and three sub-treatments (350; 510 and 650  trees/ha) with four repetitions, was installed on 12, 22 ha. Only one latex collection system was applied (S/2 d/4 6d/7 ET 2.5 % Pa 1 (1) 6/y). The parameters measured were rubber production, circumference increase, physiological profile and tapping panel dryness sensitivity. The rate of trees present in the plots was good (87.27 %) and have not varied with the design and planting density. Vegetative growth tapping (2.69 cm.year-1), and mean yield (1926 kg.ha-1.year-1) were influenced by density unlike design. Despite good productivity, the physiological state of the rubber trees was good, characterized by a well-balanced physiological profile and a low tapping panel dryness rate (2.73 %), independently of design and planting density. The density and the suitable planting design were planting in separate rows of 6 m / 650 t/ha.Keywords: Hevea brasiliensis; density and planting design; Rubber  production; GT 1; Vegetative growth tappin