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Write a paragraph on the various methods used to replenish the nutrients in the fields

9/13/2015 CBSE


Crops utilise nutrients present in the soil. These nutrients have to be replenished for the further cropping. Various methods and products are used for this purpose.



(i) Fertilizers:
Fertilizers are the chemicals which replenish the soil with all the nutrients. They are produced in the factories and are inorganic products. Every fertilizer is rich in a particular nutrient. Some examples of fertilizers are urea, ammonia sulphate, potash, NPR etc. They help in getting better and healthy yields. But, excessive use of these chemicals is also harmful.



(ii) Manure: Manures are the organic products, which are obtained by the processing of dead bodies of plants and animals. Dead bodies of plants and animals are dumped in pits. They get decomposed to become manure. Using manure not only improves the texture of the soil but also, improves the water holding capacity of the soil.



(iii) Fallowing: Sometimes continuous growing of crops makes the soil barren or infertile. It needs to be left uncultivated so that it can regain its nutrients and fertility. This process of leaving soil uncultivated for one crop season is called fallowing.



(iv) Crop Rotation:
Same crop is grown in the field year after year� leads to the deficiency of certain minerals
as� same crop requires same type of nutrients. So farmers are encouraged to grow one pulse crop in � between two cereal crops in the field.
This method of successive cultivation of different crops in an orderly manner on the same fields, in contrast to a one-crop-system or to haphazard crop successions is known as
crop rotation.



For example, growing
legumes as fodder in one season and wheat in the next season. The roots of
legumes have so many nodules which contain nitrogen fixing bacteria. These
convert free atmospheric nitrogen into nitrates and increase the fertility of
the soil.




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