Concept explainers
Interpretation: The issues involving the use of fertilizers and pesticides should be discussed.
Concept Introduction:
Fertilizers: Fertilizers are compounds that are added to plants to promote growth.
They include following types: 1. Organic fertilizer: Carbon based composed contains organic matter like vegetables, plants, cow urine etc.
2. Inorganic fertilizer: It contains inorganic chemicals like nitrogen, phosphorus and potassium etc.
For good results use of fertilizer, farmer should know the exact combination of fertilizer.
Pesticides:It is any substance or mixture of substances intended for preventing, destroying any pest. Pesticides are also those works like herbicides, fungicides, and others controlling pests.
Types: As per pests they can kill -
- Insecticides − Insects
- Herbicides − Unwanted plants and weeds
- Rodenticides − Rodents (rats & mice)
- Bactericides − Bacteria
- Fungicides − Fungi
- Larvicides − Larvae
Pesticides can also be divided as:
Biodegradable:Those which can be broken down by microbes and other into harmless compounds and which do not remain disintegrated for years
Persistent: Those which may take months or years to break down.
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Chapter 20 Solutions
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