There are more than two dozen organic fertiliser companies in the United States that sell a variety of organic fertilisers. Organic fertilisers are divided into three types: animal waste, sludge, and vegetable oil. Animal waste is defined as any waste arising from animal castings, including blood, milk, urine, and other faeces. Sludge is any solid material left over from the production of vegetables, including sewage sludge, industrial waste, and industry waste. Vegetable oil refers to any byproduct of the oil production process, such as lye, salt, soap, and fertiliser.
One of the most significant advantages of using organic fertilisers is that they are significantly better for the environment in general. Organic products are renewable because they include natural nutrients that cannot be depleted through chemical techniques. As a result, they help to preserve biodiversity, conserve water, manage erosion, improve soil fertility, prevent or control plant diseases, and improve soil drainage. They provide no environmental risk because they contain no man-made chemicals.
Organic fertilizers vary in cost depending on the type of nutrients they contain and the amount of organic matter they comprise. Low-priced organic fertilizer often contains just a small amount of both nitrogen and phosphorous, which do not add any plant nutrition. Higher priced organic fertilizers provide higher amounts of both nitrogen and phosphorus. These two nutrients are essential to plant growth and can't be synthesized by plants. Organic fertilizers that contain a large amount of nitrogen or phosphorus will tend to be more expensive than those with a lower amount of these nutrients.
Another benefit of organic fertilizer is that it provides a source of green manure for the home garden. Because manures and wastes contain high levels of nutrients, adding organic matter to the soil is a good way to provide additional plant nutrition. Manures and wastes also contain high concentrations of energy, which can stimulate the germination of seedlings, improve the quality of soil and promote the growth of beneficial bacteria. Beneficial bacteria in the soil to act as a filter that reduces the amount of dangerous nutrients like nitrogen that are introduced into the environment. This filter system reduces the risk of disease and helps to keep weed growth to a minimum.
Sources @ https://www.openpr.com/news/2192667/organic-fertilizer-market-will-generate-massive-revenue
