Humic acid are a principal  component of humic substances, which are the major organic constituents of soil (humus),peat and coal.It is also a major organic constituent of many upland streams,dystrophic lakes, and ocean water.It is produced by bio degradation of dead organic matter. It is not a single acid; rather, it is a complex mixture of many different acids .Not only in China ,but also in North of America , Europe or some other place have many. 

Here need mention is North of China ones are the most affordable one with great quality.​ 

Specification :

 Appearance:Black                            
Humic acid (dry basis):50%               

Organic matter: :60% min  
Moisture:20% max                      
PH:4-6                                  
Size:2-4mm ball

 Application
• Soil Application: 10-15kg/ha
• Irrigation: 10-15kg/ha
• Foliar Application: 8-10kg/ha with the dilution rate of 1:500-600​ 

 Benefits & Function 
• Increases organic matter of soil
• Improves potash fertilizer utilization
• Increase the release of potassium
• Improves stress tolerance of crops
• Enhances water holding capacity of soil
• Reduces soil erosion and improves work ability of soil