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Table 6 Revenue from the sale of silica fertilizer

From: Study of the feasibility of a rice husk recycling scheme in Japan to produce silica fertilizer for rice plants

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