Natural rubber remains today an unavoidable elastomer for the manufacture of technical articles such as tyres, engine mounts, etc. This is due to its specific properties, such as: - low heat build-up under dynamic stress, which is paramount for tyres (especially heavy goods vehicles). - good dynamic properties, essential for shock absorbers. - excellent adhesive properties. Unfortunately, manufacturers criticize the excessive variability of some of its properties, which leads to higher manufacturing costs, output losses and large percentages of reject end-products. In order to overcome this problem, it was felt necessary to identify the main factors responsible for the variability of certain characteristics, and quantify the contribution of each of them. Various earlier studies showed the effect of certain agronomic factors, such as the clone, on technological characteristics mesured on natural rubber crumb made from field latex. Two clones were selected with reputations for giving rubbers with different PRI values: PR 107 and PB 217. PRI did not affect the final viscosity of compounds. In particular, it appeared that rubbers with a low PRI plasticised faster and led to compounds with lower Mooney viscosities during timed mastication. Rubbers with a low PRI are less energy-intensive during processing. However, we did not find any relation between PRI and properties (tensile strength, hardness, tear and dynamic vibrations) and the ageing performance of vulcanizates.