Abstract
The experiments were conducted to determine suitable sowing time in order to achieve high plant biomass and sugar content of sweet sorghum for bioethanol manufacture. The results showed that germination rate reached > 80% in all trial times (p > 0.05). The growth and development speed of sweet sorghum reduced when seeds were sowed in August and was significantly different from other sowing times (p < 0.05). Sowing from March to June obtained the highest plant height during all growth and development stages. Lodging and diseases observed in all periods of sowing, and planting began in July and August had lower percentage. In contrast, the productivity of fresh weight (1310.4 g/whole plant), sugar content (14.9% Brix), biomass yield (122.4 tons/ha) and theoretical converted ethanol yield (5 tons/ha) were the highest when sweet sorghum planted from March to June. It was observed that sowing sweet sorghum in four periods of month from March to June had the desirable biomass for bioethanol production.
Highlights
Renewable energy resources have been intentionally pursuing as the current sources of energy that have gradually exhausted [1] [2]
Bioethanol could be collected from the microbial metabolism or plant biomass production [2] [4]-[6]
In 2007, Vietnamese government has suggested the promotion for bioethanol production from sugarcane and cassava biomass grown in many appropriate areas [7]
Summary
Renewable energy resources have been intentionally pursuing as the current sources of energy that have gradually exhausted [1] [2]. In 2007, Vietnamese government has suggested the promotion for bioethanol production from sugarcane and cassava biomass grown in many appropriate areas [7]. Those crops have respectively been feedstock for sugar manufacture and consumption, and they are usually affected by trading cost. The Northern region seems to be more appropriate for cultivating sweet sorghum, and Thai Nguyen province is firstly chosen for trial cropping because of its salubrious climate An instance of this is the range of temperature which varies from 18 ̊C to 20 ̊C, and the rainfall in this region changes approximately from 2000 to 2500 mm annually [15]. It is necessary to evaluate the effects of sowing time from March to August on the germination rate, growth, development, and especially the quality of the desirable product as sugar content
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