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Bio-fertilizers are normally the name given to manure and compost, although there are other materials which qualify.
Advantages- wider range of nutrients, particularly micronutrients
- help increase soil organic matter content
- relatively inexpensive
- no (or negligible amounts) of harmful materials such as heavy metals
- much lower nutrient density -- requires large amounts to get enough for most crops
- requires a different type of machine to apply than chemical fertilizers
- sometimes hard to locate in certain areas
- odor
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