OBOUAYEBA,  Samuel DIARASSOUBA, Moussa TUO, Seydou CAMARA, Brahima <br/><br/>
Adaptation of latex harvesting technoloqies to the three metabolic activity classes of rubber clones according to socio-economic conditions in Cote d'Ivoire 
= Adaptation des technologies de recolte du latex aux trois classes d'activites metaboliques des clones d'heveas selon les conditions socio-economiques en Cote d'Ivoire 


 - Abidjan  American Journal of Food and Nutrition  Janv 2022 
 - 2021 
<br/><br/> Two concerns of rubber farmers are the development of latex harvesting technologies to improve the<br/>production potential of the trees and the availability and cost of labour for tapping. To achieve this, some rubber<br/>farmers opt for over-harvesting the trees. This way of doing things disturbs the physiological balance of the rubber<br/>trees, which leads to the increase of tapping Panel dryness (TPD) and rather to the fall of the production. To solve<br/>this problem, the present study proposes to define one or more latex harvesting technologies by metabolic class<br/>allowing the improvement of plantation yield and the increase of the economic life of the trees. To achieve this, the<br/>clones IRCA 111, IRCA 130 and PB 260 from the active metabolic class, GT 1, RRIC 100 and BPM 24 from the<br/>moderate metabolic class; PB 217 and PR 107 from the slow metabolic class were used as plant material. Results<br/>showed that clones in the slow metabolism class were less susceptible to TPD and performed better in intense latex<br/>harvest than those in the active and moderate metabolism classes. Regardless of metabolic class, the reduction in<br/>tapping frequency had no negative effect on the vegetative state of the trees. Instead, the reduction in tapping<br/>frequency was compensated by a large number of annual stimulations, which resulted in high dry rubber production.<br/>Analysis of dry rubber production, rubber tree radial growth and TPD rate indicates that the metabolically active<br/>class clones performed better with the S/2 d3 6d/7 ET2 latex harvesting technologies. 5% Pa1(1) 4/y; S/2 d4 6d/7<br/>ET2.5% Pa1(1) 4/y; S/2 d5 6d/7 ET2.5% Pa1(1) 8/y and S/2 d6 6d/7 ET2.5% Pa1(1) 10/y. Those of the moderate<br/>metabolism class are with the motifs S/2 d3 6d/7 ET2.5% Pa1(1) 6/y; S/2 d4 6d/7 ET2.5% Pa1(1) 6/y and S/2 d5<br/>6d/7 ET2.5% Pa1(1) 10/y. For the slow metabolism class clones, the following latex harvesting technologies were<br/>recommended: S/2 d3 6d/7 ET2.5% Pa1(1) 8/y; S/2 d4 6d/7 ET2.5% Pa1(1) 12/y and S/2 d6 6d/7 ET2.5% Pa1(1)<br/>18/y 
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