can affect the wheat cultivation for food in the future. 3.3. Sugarcane Sugarcane grows only in tropical areas and it is a very efficient and productive crop for biofuels. Brazil is the major sugarcane producer, where the production of ethanol from sugar cane started in the 1980s and has grown to 22.24 billion liters in 2007 (Zuurbier, 2008). Sugarcane is used as a feedstock for producing bioethanol and the residual leftover bagasse - is used in heat and power generation. That is one of the characteristic that gives sugarcane production an advantage over other fuels. But sugarcane is also the major source of sugar in the world; about 80% of today's sugar is made from sugarcane, cultivated in tropical and subtropical areas of the southern hemisphere. In Brazil, however, sugarcane utilisation for biofuels does not pose competition for sugar
However, for imparting spe- tration affects the optical density of the cific color or flavor to some products, wood smoke. The optical density is proportional to from other trees that are rich in resins, includ- the number of particles in a unit volume of ing coniferous, as well as heather, may be the smoke. In constant conditions, when the used. In some areas, other carbohydrate- dimensions of the particles do not change, the rich material (e.g., bagasse [sugarcane], beet optical density is correlated to the mass con- refuse from sugar making, or coconut husks) centration of the dispersed components in the is used. smoke. Thus photo optical measurements can The smoke consists of gaseous products be used for the determination of smoke of thermal degradation and subsequent partial density, which reflects the contents of all
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