The Types of Organic Fertilizers
Organic fertilizers can be roughly classified into the following four categories:
- manure and urine: including human and animal excrement and manure, poultry manure, sea bird manure, and silkworm.
- Stacking manure: including compost, manure, straw and biogas fertilizer.
- Green manure: including cultivated green manure and wild green manure.
- Miscellaneous fertilizers: including peat and humic acid fertilizers, oil mites, soil fertilizers and sea fertilizers.