Organic fertilizers

thumb|Animal manure is often a mixture of animal feces and bedding straw, as in this example from a [[stable.]]

thumb|upright=1.3|Community-level composting in a rural area in Germany

fertilizer developed from natural processes

flour made from dried and ground fish or parts of fish

Ground mixture of bone and slaughterhouse waste products used as a fertilizer, and other uses

animal waste thinned with water and used as fertilizer

residue powder left after the combustion of wood

right|thumb|Blue-green Algae|Blue-green algae cultured in specific media. Blue-green algae can be helpful in agriculture as they have the capability to fix atmospheric nitrogen to soil. This nitrogen is helpful to the crops. Blue-green algae is used as a biofertilizer.

powder made from blood used as fertilizer and animal feed

cow urine, liquid by-product of metabolism

fermentation process for food waste and similar organic matter

material formed from calcination of bones

A bioeffector is a viable microorganism or active natural compound which directly or indirectly affects plant performance (biofertilizer), and thus has the potential to reduce fertilizer and pesticide use in crop production.

fine-grained, silt-sized particles of rock

poultry feather product

circular concrete structure holding liquid manure

agricultural practice

liquid fertilizer or phytopharmaceutical from fermented plant biomass

feces of chickens used as an organic fertilizer, especially for soil low in nitrogen

by product from the olive oil mill extraction process

thumb|300px|Pumpkin seedlings planted out on windrows of composted biosolids Biosolids are solid organic matter recovered from a sewage treatment process and used as fertilizer. In the past, it was common for farmers to use animal manure to improve their soil fertility. In the 1920s, the farming community began also to use sewage sludge from local wastewater treatment plants. Scientific research over many years has confirmed that these biosolids contain similar nutrients to those in animal manures. Biosolids that are used as fertilizer in farming are usually treated to help to prevent disease-