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Effect of Genotype and Genotype x Nitrogen Rate Interactions on Color in Juice and Raw Sugar from Sugarcane

^a CSIRO Plant Industry, Davies Lab., PMB, PO Aitkenvale, Qld. 4814 Australia
^b Bureau of Sugar Experiment Stations, Meiers Road Indooroopilly, Qld. 4068 Australia
^c Bureau of Sugar Experiment Stations, Gordonvale, Qld. 4865 Australia
^d CSIRO Plant industry, Queensland Bioscience Precinct, 306 Carmody Road, St Lucia, Qld. 4066 Australia
^e Bureau of Sugar Experiment Stations, Bundaberg, Qld. 4670 Australia
^f Dep. of Biological and Physical Sciences, Univ. of Southern Queensland, West St, Toowoomba, Qld. 4350 Australia
^g CSR Ltd, Kalamia Mill Estate, Ayr, Qld. 4807 Australia

View larger version (16K): [in a new window]   Fig. 1. Color (I.C.420) at pH 4 and 9, and color (at pH 7) at 1% impurity, versus color at pH 7, across 12 genotypes in Exp. 2. This experiment evaluated genotypes across three contrasting N rates, and the average of genotypes across all N levels is shown. Vertical and horizontal bars indicate least significant differences (P < 0.05).

View larger version (29K): [in a new window]   Fig. 2. Performance of genotypes in Exp. 3 for: (a) Color (I.C.420) in 2000 versus 2001, (b) color at 1% impurity in 2000 versus 2001, (c) color at 1% impurity versus mean color averaged across 2000 and 2001, and (d) amino N levels in 2000 versus 2001. In this experiment genotypes were tested across three N rate treatments and two time of harvesting treatments in a plant crop (2000) and ratoon crop (2001). Genotype x N rate or time of harvesting effects were not significant and the average of genotypes across treatments in each year are shown here. Vertical and horizontal bars indicate standard errors.