Productivity-based evaluation of elite sugarcane cultivars for sustainable sugar production
Main Article Content
Keywords
efficient production period, excessive sucrose recovery, maturity stage, quality indices, sugarcane varietal performance
Abstract
This study was aimed at screening out local and exotic sugarcane clones based on productivity. Twenty-three early sugarcane varieties cultivated at model farms of Sugar Research Institute Shakkarganj (Pakistan) on September 2008 were examined periodically for juice extract, Brix, Pol, purity and sucrose recovery during the October to March crushing season of 2009-2010. A steady rise in quality was seen from the 11-12 month growth period until maturity with a clear decline afterwards to follow a quadratic equation given a strong correlation coefficient r2?1. A highly significant difference (P<0.01) was observed within varieties and harvest period for all quality parameters. Juice extract (75.60%) and purity (87.65%) were recorded at a maximum in CP-77-400 and CP-80-1827 cultivars, respectively, whereas Brix (20.44%), Pol (17.10%) and sucrose recovery (11.03%) were highest in the CSSG-676 variety. Screening of cultivars was implemented on the basis of a logically developed productivity scale based on high sucrose recovery (?9.5%). The validity of the technique was ascertained by comparing varietal potentials on a productivity scale with those at ‘full maturity’ and from ‘mean estimates’. Based on productivity, CSSG-676, HoSG-2875, HSF-240, CP-77-400 and CP-87-1628 were demonstrated to be outstanding cultivars resistant to climatic stresses giving 7.69-9.78% excessive sucrose recovery. The CP-65-357, CPF-243, CP-85-1491, HoSG-1257, CP-72-2086, CP-80-1827, HoSG-104 and CPF-237 were also shown to be promising varieties with a high excessive sugar yield. Ganjbakhsh, Hoth-127 and SPSG-26 varieties did not perform well, and the cultivar GT-11 could not even reach the established minimum sucrose recovery level. The study would certainly be helpful in improving the gloom scenario of the sugar industry worldwide
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