Abstract: A two-season located field experiment was conducted to study the effects of products developed from insoluble potassium mineral: granular silicon-calcium-potassium fertilizer (Granular fertilizer) and microporous mineral fertilizer (Microporous fertilizer) substitute for potassium chloride on yield, economic efficiency and K absorption and utilization of late rice and early rice in the southern rice region. Effects of the products developed from insoluble potassium mineral on rice yield, economic efficiency and K absorption and utilization were analyzed through application of granular silicon-calcium-potassium fertilizer and microporous mineral fertilizer compared with application of potassium chloride and application of no potassium. The results showed that application of potassium chloride and the products developed from insoluble potassium mineral increased the yield of late rice by 377.2-715.0 kg/hm2 and increased the income of late rice by 568-1616 yuan/hm2. Products developed from insoluble potassium mineral substitute for potassium chloride (except for the 100% granular fertilizer treatment) increased the output/input ratio of late rice. Application of potassium chloride and the 100% products developed from insoluble potassium mineral increased the yield of early rice by 383.1-1339.6 kg/hm2 and increased the income of early rice by 584-3107 yuan/hm2. Application of 50% products developed from insoluble potassium mineral decreased the yield of early rice by 16.5 kg/hm2 and 122.9 kg/hm2. Products developed from insoluble potassium mineral substitute for potassium chloride decreased the output/input ratio of early rice. Application of potassium chloride and the products developed from insoluble potassium mineral increased the total amounts of K uptake of late rice and early rice. Products developed from insoluble potassium mineral substitute for potassium chloride decreased the total amounts of K uptake of late rice and early rice. Products developed from insoluble potassium mineral substitute for potassium chloride improved the K use efficiency of late rice and early rice. Products developed from insoluble potassium mineral substitute for potassium chloride can meet the needs of late rice growth, but cannot meet the needs of early rice growth. Increasing the application rate of products developed from insoluble potassium mineral or combined application products developed from insoluble potassium mineral with potassium chloride for the early rice planting should be considered.