Excretory materials of animals and dead and decayed bodies of different organisms and their parts also supply nutrients for plants. Cow dung and faces of animals ans decayed straw and green plants, ash, bone, food, etc. are some of their examples. All of them are obtained from different types of plants and animals.
Thus, those fertilizers which are obtained from the body organisms are called organic fertilizers. Such fertilizers contain varieties of nutrients for plant but their amount is less. Such types of fertilizers are required in large amount to be used in land. They lose their fertility by their storing for a long time.
These fertilizers are cheap and Eco-friendly too. They are also known as manure or natural fertilizers.
Some examples of organic fertilizers
- compost manure
The organic fertilizers, which are prepared by decaying urine and fasces of animals, straw, leaves etc., are compost fertilizers. Such fertilizers are made in pits by aerobic and anaerobic method. In cities special types of plastic tanks are available to make compost fertilizers inside them. Their main supply is nitrogen.
b. Green manure
This type of organic fertilizer is made by decaying young green plants in field. In terai fast growing leguminous plant like hemp and jute are used for this purpose. They mainly supply nitrogen. Decaying is made easier in damp or wet land.
Ash is obtained by burning different parts of plants. Such fertilizers are rich in potassium. Volcanic ash is equally enriched in potassium though it is not organic manure.
d. Bone meal
Bone meal is bone powder of dead animals it mainly supplies calcium and phosphorus for the plants in the soil.
Advantages of organic fertilizers
1. It supplies all the required nutrients to the plants.
2. It does not degrade the quality of soil.
3. It does not cause any chemical pollution.
4. It contains varieties of nutrients required for plants.
5. It is cheap and easily available everywhere.
Disadvantages of organic manure
1. They contain fewer amounts of nutrients for plants. So they need to be used in large amount.
2. They cannot be stored for long days as their fertility decreases due to the process of denitrification.
3. They need more labor to prepare, to transport and mix up with soil.
4. During their preparation they mix up bad odor with the air in the atmosphere.
5. It releases green house gases and increases green house effects.
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