000			01767nam a2200229Ia 4500
008			220216s9999 xx 000 0 und d
100			_aLe Roux Y
245		0	_aSeasonal and clonal variations in the latex and raw rubber of Hevea brasiliensis
260			_bJournal of Rubber Research _c2000
300			_a142-156
520			_aThe variation in the quality of raw natural rubber causes serious problems associated with processing and grading with the quality of processed crop varying with changes in season, clonal origin and especially with the maturation time of the cuplump material. This study was undertaken to evaluate the contribution of these sources of variation and where possible, identify latex physiological parameters as early markers of properties of the processed crumb. Relationships between certain physiological parameters of latex analysed by micro-latex diagnosis technique and some relevant technological properties of raw rubber were estimated for some selected clones. These were found to be greatly influenced by eco-climatic conditions. Highly significant clonal variations were also observed in the physiological parameters of latex while these variations were not so consistent for most of the technological properties. Finally, significant correlations were observed between some technological properties and physiological parameters notably between the inorganic phosphorus and plasticity retention index and between the total solid content and the Mooney viscosity.
650			_aClonal variation
650			_aHevea brasiliensis
650			_aRaw rubber
700			_aEhabe E
700			_aGobina S
700			_aNgolemasango F
700			_aNkeng J
700			_aNkengafac J
700			_aSainte-Beuve J
942			_cJS
999			_c68483 _d68483