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India's biofuel industry is currently producing ethanol by fermentation of a by product of sugar industry called molasses. Tewaria et al. (2007) found that the conversion efficiency of current manufacturing methods of ethanol in India is 6 - 8 % only, carbon dioxide; a very important green house gas is also emitted during the fermentation of molasses. The remaining dilute molasses is utilized in producing more than 90 % pure alcohol.

For the successful production of biofuels, the availability of raw material is very important factor. According to results found by Gonsalves (2006), actual yield of sugarcane is different for different regions. The yield is 77 tonnes/ ha and 53 tonnes/ha for tropical and subtropical provinces respectively. The energy efficiency of sugarcane is deeply studied due to intensive utilisation of molasses in the preparation of ethanol. Careful studies carried out by Gonslaves (2006) reported that the production of sugar from one tonne of sugarcane was 105 kg and molasses produced from this quantity was 40 kg. This 40 Kg molasses out of one tonne sugarcane can be yields 10 litres of ethanol only. From business point of view this efficiency is very important to assess the cost of production for ethanol in India.

It is also important to note that all the cane is not utilized for sugar production; only 60 % of the total cultivated sugarcane reaches sugar industry while more than 30 % is utilized for the production of artificial sweeteners. The remaining yield of sugarcane conserved as seed for the next crop. Molasses is available in abundant supplies due to large scale production of sugar in the country and it is being used as a major raw material of biofuel industry. The same studies by Gonsalves (2006) revealed that if the entire sugarcane plant is used as biomass in biofuel industry it may yield up to 70 litres of biofuel from one tonne of sugarcane plant.

Indian biofuel industry is producing very low yield of ethanol and biodiesel due to sole dependence on the sugarcane crop and molasses. The use of sugarcane molasses is a limiting factor in the efficiency of biofuels in India. The chief reason for this inefficiency is the resource intensive nature of sugarcane crop; it requires a lot of energy input in the form of nutrients, insecticides, and more water than other food as well as feed stock crops. Another disadvantage is the long growing period of crop extended up to twelve to thirteen months. According to report published by GPZ (2007), two best alternatives for the sugarcane that are available in Include the sorghum and sugar beet which require less energy inputs and growing period while provide large amount of biomass for the efficient generation of biofuels.

A comparison of the aforementioned three crops shows that sugar beet and tropical sorghum has clear advantage over sugarcane crop. These crops have the property of drought tolerance along with less resource utilization, moreover the harvesting process is very simple fir these two when compared with the sugarcane. The tropical sorghum has a very short l本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。