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The effect of cane variety and other agricultural factors on juice composition.

Juice extracts from clean, fresh cane stalks from nineteen runs of the 1999 South African Sugar Association Experiment Station varietal trial program have been used. Twenty-six varieties from seven geographical locations in South Africa were involved. In addition, factors such as cane age, ratoon number, burnt or trashed, rainfed or irrigated were available. The extracts were analysed for brix, colour, phosphates, silica, gums, calcium , potassium and sulphated ash. The paper presents these results and discusses the impact of the factors, particularly variety and location. The concentration of gums, which influences processing and sugar quality, is shown to be highly dependent on location and on variety, while colour is predominantly a varietal effect.