Page 9 - Genius Kidz Prudence Learning Sc-8

3. Adding Manures and Fertilizers : Why do (a) Chemical fertilizers : These are
we add fertilizers when surplus supply of synthetic inorganic fertilizers. Common
nutrients is already available in soil? types include NPK (Nitrogen

This is because soil becomes deficient in some Phosphorus Potassium), CAN (Calcium
particular nutrient sometimes or the plants Ammonium Nitrate), Ammonium
have additional requirement of a particular Sulphate, Superphosphate and urea.
mineral. In such a situation fertilizers are used (b) Manures : These are organic fertilizer.
and the corresponding demand of a specific They include plant and animal wastes.

nutrient is fulfilled. Manures are of three types :
Definition : Any organic or inorganic material Cow dung + urine +
either of natural or synthetic origin that is left over cattle feed + litter (bedding of

added in the soil to meet the nutrient demand cattle) form farmyard manure.
of plants is called a fertilizer. Compost :
Forms of fertilizers: These can be in the form of ® subjected to composting forms
a powder or a tablet or in liquid form. compost.

Types of fertilizers: On the basis of their origin, Vermicompost :
these can be chemical fertilizer or organic earthworms' action is vermicompost.
manure.
Activity 2

Stick the photograph of at least 5 different types of chemical fertilizers in the space provided and also write their
names along with composition in the space provided.
Name of the fertilizer Composition of the fertilizer
1.

_________________________ _________________________

2.

_________________________ _________________________

3.

_________________________ _________________________

Field following, crop rotation and multiple cropping are the natural processes that aid in replenishment of soil
nutrients.

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