000			01965nam a2200337Ia 4500
008			220216s9999 xx 000 0 und d
100			_aVarghese Y A
245		0	_aEarly evaluation in Hevea: Growth and yield at the juvenile phase
260			_bIndian Journal of Natural Rubber Research _c1993
300			_a19-23
520			_aThirteen clones, with yield levels ranging from high to low, were evaluated for juvenile growth, yield and yield components at the nursery stage to identify early selection parameters. Computation of growth and performance indices revealed that, in general, high yielders recorded higher values in comparison to medium and low yielders. Correlations of juvenile yield with the yield components, plugging index, DRC and panel length at the age of three years were highly significant and 54.5 per cent of the total variability for juvenile yield could be accounted for by these three variables. Correlations for girth and juvenile yield between two and four years of age were also highly significant. The results reveal that based on girth and yield at two years, high yielders could be selected. However, certain vigorous medium yielders are also likely to record high juvenile yield. A rational approach to reduce progeny size as well as to ensure evaluation of all potential high yielders would be to select all genotypes giving better performance index than the general mean.
650			_aEarly evaluation
650			_aEarly evaluation
650			_aGrowth index
650			_aGrowth index
650			_aHevea brasiliensis
650			_aHevea brasiliensis
650			_aIndia
650			_aIndia
650			_aPerformance index
650			_aPerformance index
650			_aPlant breeding
650			_aPlant breeding
650			_aYield components
650			_aYield components
700			_aJohn A
700			_aPanikkar A O N
700			_aPremakumari D
700			_aSethuraj M R
942			_cAR
999			_c47190 _d47190