Sweet sorghum bagasse – A source of organic manure

Sawargaonkar, G L and Wani, S P and Pavani, M and Ravinder Reddy, Ch (2013) Sweet sorghum bagasse – A source of organic manure. In: Developing a Sweet Sorghum Ethanol Value Chain. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh, India, pp. 155-162. ISBN 978-92-9066-555-7

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Bagasse or silage is an important by-product in the sweet sorghum-based ethanol industry. Above ground biomass distribution in sweet sorghum forms 90% of the total biomass produced and that includes stem, leaves and panicle with grain. It is estimated that bagasse makes 30% of the total biomass of sweet sorghum, which is composed of cellulose (15-25%), hemi cellulose (35- 50%) and lignin (20-30%) with Net Calorific value: 4,125 Kcal kg-1 (ash free); depending on the genotypes (Grassi 2001). Approximate composition of sweet sorghum bagasse is given in Table 1. It is estimated that 6-7 kg of bagasse will be produced for every liter of ethanol produced from sweet sorghum. Even though bagasse has multiple uses such as being a source for energy cogeneration, animal feed and organic manure, it is important to work out the trade-offs between its uses as a source of bio-fuel and carbon balance in the whole production-to-consumption chain. In this context, recycling of bagasse into organic manure and using it in the crop husbandry is an environmentally safe measure of sequestering carbon in the soil. Sweet sorghum is promoted in the semi-arid regions where organic carbon content in the soil is generally low and the application of bagasse as organic manure assumes great importance for sustaining the soil fertility. The direct application of bagasse to the soil causes temporary lock up (immobilization) of soil nitrogen (N) due to wider C: N (~35:1) ratio and hence, it is important to bring down the C: N ratio by vermicomposting to use it as organic manure. Composting is the value addition method for enriching organic residues with low N content and this can be done either through microbial flora or along with earthworms. Generally, composting of organic residues with earthworms is referred to as vermicomposting, which is a rapid and simple method. The composition of vermicompost is superior in terms of macro and micro nutrients; besides, it is rich in plant growth promoting substances. The composting of sweet sorghum bagasse with earthworms is focused in the project and protocol was standardized for the same through laboratory and on farm trials.

Item Type: Book Section
Divisions: RP-Dryland Cereals
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Sorghum
Subjects: Mandate crops > Sorghum
Depositing User: Mr Siva Shankar
Date Deposited: 24 Jan 2014 11:22
Last Modified: 19 Oct 2016 06:16
URI: http://oar.icrisat.org/id/eprint/7369
Acknowledgement: UNSPECIFIED
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