Table 4 Cost of producing biochar from pigeonpea and maize (given in INR: Indian rupees)
Capital investment per kiln | INR per kiln |
|---|---|
Cylindrical metal drum | 600 |
Gas cutting of vents | 500 |
Handle fitting and top lid | 400 |
Total cost | 1500 |
Operational cost of biochar production | |
Kiln operation (1 man-day) | 300 |
Processing of residues (2 man-days) | 600 |
Cost of production | 900 |
Conversion efficiency of pigeonpea | 28% |
Conversion efficiency of maize | 23% |
Cost of production | 900 |
Pigeonpea stalk biochar (kg) | 28% |
Maize stalk biochar (kg) | 23% |
Market price of biochar | 50% |
Gross income- from pigeonpea | 1400 |
Gross income- from maize | 1150 |
BCR-pigeonpea* | 1.6 |
BCR-maize* | 1.3 |