The researchers aimed to find the best way to make iron-enriched germinated brown rice. They used brown rice from Jiang-xi and tested different soaking and culture conditions for germination. By treating the rice with ferrous sulphate at various concentrations, they found that the iron content in the rice increased with higher concentrations. The optimal process involved soaking the rice in a 0.25 g/L solution of ferrous sulphate for 9 hours at 28°C, then culturing it for 20 hours at 30°C. This resulted in iron-enriched germinated brown rice with 100 mg/kg of iron and over 80% germination. It was concluded that the ferrous sulphate concentration in the soaking solution should not exceed 1 g/L.