Is refractometric field brix an unreliable predictor of sugar content ?
| MSI99P3398 | |
| Mamet, L. D. | |
| Is refractometric field brix an unreliable predictor of sugar content ? | |
| Periodical article | |
| 1999 | |
| Proc. int. Soc. Sug. Cane Technol. | |
| 23 (2): 522-523 | |
| abstract only | |
| En | |
| The preliminary stages of many sugar cane selection programmes throughout the world are based on the premise that refractometric field Brix is a reliable estimate of sucrose content. This relationship is questioned in this paper. Data from two trials in Mauritius were used to study the stability of field Brix at three dates, the predictive value of field Brix for sucrose content at ta later date, and the temporal repeatability of this criterion. The results clearly indicate that, when field Brix measurements and laboratory analysis for pol per cent cane are measured on the same sample, the relationship between the two parameters is very strong irrespective of vartiety, family or date of sampling (r2=0.70-0.90). When Brix is measured on standing cane and destructive samples were taken for laboratory analysis at another date (from a different sample from the same plot) the relationship weakens considerably but is still positive (r2=0.43-0.62). The inter-relationships between field Brix measurements at ten dates, from pre-harvest (April) to mid- season harvest (September), were also studied and the results indicated that there are large temporal differences in repeatability (r2=-0.03-0.08). It is concluded that the reliability of refractometric field Brix as a predictor of sucrose content depends upon the method and the time of sampling for Brix. | |
| SUGARCANE BREEDING | |
| MAURITIUS | |
| Cane breeding and genetics | |
| 2000-07-28 | |
| En | |
| cat | |
| PB Biom Biom |