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ARS Home » Southeast Area » Canal Point, Florida » Sugarcane Field Station » Research » Publications at this Location » Publication #161721
Title: THE EFFECT OF GENOTYPE ENVIRONMENT AND TIME OF HARVEST ON SUGARCANE YIELDS IN FLORIDA, USA

Author
item GILBERT, ROBERT - UNIVERSITY OF FLORIDA
item SHINE, JAMES - SUGARCANE GROWERS COOP
item Miller, Jimmy
item RICE, RONALD - SUGARCANE GROWERS COOP

Submitted to: Field Crops Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/12/2005
Publication Date: 1/31/2006
Citation: Gilbert, R.A., Shine, J.M., Miller, J.D., Rice, R.W., Rainbolt, C.R. 2006. The effect of genotype, environment and time of harvest on sugarcane yields in Florida, USA. Field Crops Research. 95:156-170.

Interpretive Summary: Sugarcane in Florida is harvested over a five month (October - March)period. Different cultivars have different maturity dates and cultivars sometime respond differently when planted under different conditions (soil types, fertility levels, water tables depths). Three sets of data were analyzed to determine the effects of cultivar, environment and time of harvest on sucrose content of the cane (KST) cane yield per hectare (TCH) and yield of sucrose (TSH) for recently released cultivars in South Florida. Early harvest (October) reduced yield of sucrose by 28% compared to a February harvest date. Sucrose yield varied from 2-46% across environments, with the most productive being the "warmland" site near Lake Okeechobee. Sucrose content varied up to 51% across these tests. CP 89-2143 had the highest sucrose content of all cultivars tested at all sampling dates. However, other cultivars had significant cultivar X environment interactions so multilocation yield tests are still needed.

Technical Abstract: In Florida, sugarcane (Saccharum spp.) is grown across different production environments and is harvested over a 5-month (October ' March) period. While many studies have examined genotype x environment interactions and their implications for breeding program design, knowledge is limited regarding interactions of genotype, environment and time of harvest and their implications for growers. Three non-confounded data sets ('case studies') were analyzed to determine the effects of these three factors on kilograms of sugar per ton (KST), tons of cane per hectare (TCH) and tons of sugar per hectare (TSH) for recently-released cultivars in south Florida. Cultivar (genotype), environment, time of harvest and their interactions had significant effects on KST, TCH and TSH. Sugarcane KST and TSH were reduced by 28 and 29%, respectively, when harvested in mid-October compared to optimum harvest dates in February. TSH varied from 2-46% across environments. The Lakeview 'warmland' site near Lake Okeechobee recorded significantly higher TCH and TSH than other sites, and cultivars CP88-1508 and CP88-1834 recorded higher relative yields at Lakeview. Cultivar TSH varied up to 51% across the case studies. CP89-2143 had significantly higher KST than other cultivars in all 21 pairwise comparisons in the three case studies, and a remarkably high, stable KST ranking across environments. Growers in the Everglades Agricultural Area interested in improving sugarcane crop sucrose concentration should plant CP89-2143. However, significant cultivar x environment interactions for other cultivars support continued multi-locational evaluation of sugarcane germplasm both during the breeding program and following cultivar release.