The effects of different organic fertilizers on yield, soluble sugar content and free amino acids content of the double cropping rice in southern China were studied by using field plot test. The results showed that the treatment D that using 20% of pig manure compost to instead of 20% of chemical fertilizer and treatment C that using 10% of pig manure compost to insteadof 10% of chemical fertilizer had the highest yield; the yield of early rice in treatment D increased by 123.38% than that in treatment with no fertilization and by 8.41% than that in treatment with pure chemical fertilizers; th...