Fig. 5
Results of questionnaire about rice husk silica fertilizers. (a) What kinds of effects do you expect silica fertilizer made from rice husks to have on to rice plants? (b) What factors influence your purchase of a silica fertilizer? (c) What states of fertilizer do you prefer? (d) What do you expect from silica fertilizer made from rice husks? (e) How much silica fertilizer would you apply to 100,000 m2? and (f) How much would you be willing to pay for silica fertilizer made from rice husks for an area of 100,000 m2?