Organic Fertilizers

Organic Fertilizers


fertilizers containing nutrients in the form of organic compounds of plant or animal origin. Organic fertilizers have varied agronomic effects on soil properties. When they decompose as a result of the vital activity of soil microorganisms, they form humus and compounds of nitrogen, phosphorus, potassium, calcium, sulfur, and other elements that are accessible to plants. The carbon dioxide given off during decomposition fills the soil air and the ground layer of the atmosphere, improving the carbon nutrition of plants. Systematic application of organic fertilizers improves the physicochemical and chemical properties and the water and air conditions of the soil and stimulates the vital activity of useful microorganisms, such as nitrogen-fixing bacteria and ammonia producers. Organic fertilizers serve mainly to implement the soil-plants-animals-soil cycle of nutrients. The use of organic fertilizers makes possible the application of mineral (inorganic) fertilizers in large quantities and high crop yields.

Organic fertilizers include most indigenous fertilizers (manure, liquid manure, peat, compost, and poultry manure), green manure, urban wastes (garbage and garbage composts, sludge, and fecal matter), wastes from the food and tanning industries, sapropel (silt), straw, and guano. The nutrient content of the most common organic fertilizers is given in Table 1.

Table 1. Nutrient content of organic fertilizers (percent by weight)
Liquid manure ....0.25–0.500.10–0.120.4–0.60.06–0.08
Top peat .......0.8––0.10.3–0.5
Bottom peat .....2.0–3.00.2–0.40.1–0.32.0–3.0
Collected compost ......0.3–0.50.2–0.40.3–0.60.5–3.0
Poultry manure .....4.0–6.03.5–5.02.5–3.5

Organic fertilizers have been known since the beginning of farming. They were used in China, Korea, and Japan 3,000 years ago. In the 13th and 14th centuries, manure was already in use in the countries of Western Europe and in what is now the European part of the USSR; green manure has been used in Middle Asia since ancient times. In the second half of the 20th century, annual world consumption of organic fertilizers was 3–4 billion tons, which corresponds to 15–20 million tons of nitrogen, 3–4 million tons of P2O5, and 18–24 million tons of K2O. In the USSR, 360 million tons of organic fertilizer was applied to the fields in 1965, 468 million tons in 1970, and more than 500 million tons in 1973.

Organic fertilizer is applied during plowing (sometimes during cultivation), placed in seed furrows during planting of such crops as potatoes and cabbage, or applied as top dressing. It is also used as a fuel, for making soil mixtures and mixtures with mineral fertilizers, and for mulching planted areas. The amounts of organic fertilizer applied range from 15 to 60 tons per hectare (ha), or up to 80–100 tons per ha for vegetables and hemp, and 5—10 tons per ha for application in furrows. The amounts applied in combination with mineral fertilizers are much lower.

Organic fertilizers are most effective on soddy-podzol soils. The gain in yield, in quintals per hectare, is 50–60 for potatoes, 30 for sugar beets, 60–100 for vegetables, and 6–7 for cereal crops.


Spravochnik po udobreniiam. Moscow, 1964.
Prianishnikov, D. N. Izbr. soch., vol. 1. Moscow, 1965.
Agrokhimiia. Edited by V. M. Klechkovskii and A. V. Peterburgskii. Moscow, 1967.
Primenenie organicheskikh udobrenii. Moscow, 1971.


References in periodicals archive ?
Islamabad -- Ministry of Textile Industry would organize one-day seminar on 'cotton crop nutrition' in order to promote use of organic fertilizers against the use of synthetic fertilizers for enhancing and maintaining the soil health to achieve maximum per-acre output of different crops in the country.
Government initiatives and subsidies promoting the use of organic fertilizers.
In this manner, it is essential to know and understand the dynamics of the N mineralization in the soil and the efficiency index (EI) of the N from organic fertilizers, in order to make feasible to establish agronomic recommendations concerning the correct dosages and period of adhibition (MELO et al.
Farmers have to wait 3 to 14 days before they can use the bokashi and mix it with other organic fertilizers such as vermicompost.
2012) demonstrate the beneficial effects of the application of organic fertilizers including of the application of poultry manure in high doses (tons per ha), which has a low concentration of nutrients compared to mineral fertilizers.
As you complete the final step, steer clear of overpriced organic fertilizers.
Anyway, low oxygen levels there would retard microbial growth, which is necessary to unlock nutrients from most organic fertilizers.
The government should spend funds for development of seed stock, use of biological means of protection and organic fertilizers, he added.
MULTAN -- Agriculture experts have urged growers to apply a mixture of chemical and organic fertilizers in the on-going month of December to get good production.
We are determined to promote organic fertilizers in agriculture as they are environmental friendly.
Inputs permissible for the manufacture and handling of organic fertilizers are regulated by the National Organic Program National List of Allowed and Prohibited Substances (USDA 2009a), a list mandated by the Organic Foods Production Act of 1990 (OFPA) and effective as of October 2002.