Table 6 Revenue from the sale of silica fertilizer
| Item | Income (USD) | Remarks |
|---|---|---|
| Ash fertilizer sale | 46,200 USD = 50 kg h− 1·6 h d− 1·220 d yr− 1·0.7 USD kg− 1 |
50 kg h− 1: effective silica 6 h d− 1: dairy operation 220 d yr− 1: yearly operation 0.7 USD kg− 1: fertilizer price |