Chemical Fertilizer – Science
- Fertilizers are those substances by use of which we can increase the fertility of the soil.
- Organic Fertilizer: Organic fertilizers are the natural fertilizers obtained from the decay and decomposition of animal remains poultry droppings and dead plants. They provide necessary nutrients for the growth of plants but in less amount than chemical fertilizers. They have very less amount of nitrogen. Some examples of organic fertilizers are ash, bone meal, green fertilizers, etc. Some of the most used types of organic fertilizers are given below: Green manure: Fertilizers obtained from green plants like grasses, leaves, used plants etc. are green manure.
They provide necessary nutrient for the plant. These plants are grown first and after its use, they are turned into the soil to increase the fertility of the soil. They increase crop yields, protect the plant from various pests and increase the overall fertility of the soil.
Compost manure: Compost manure is a natural fertilizer obtained from dead and decayed things or the mixture of cattle dung, poultry droppings, and crop residues. For the preparation of compost manure, at first all unnecessary or used decomposable things and wastes of animals are mixed and kept in a pit. They are left for some days. Lime is also added to make good fertilizers. They are decomposed by microorganisms and are converted to compost which can be used to increase the fertility of the soil.
Advantages of Organic Fertilizers
- They supply nutrients slowly for the plants, so they last longer.
- Food produced by using organic fertilizers is free from harmful chemicals.
- They are biodegradable and does not pollute the environment.
- It can be produced by produced locally or by a single person him/herself.
- It maintains the fertility of the soil for hundreds of years and does not affect the ecosystem of the soil.