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प्रश्न
What are fertilizers ? Classify fertilizers.
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उत्तर
Fertilisers are organic or inorganic materials that are mixed in the soil to provide plant nutrients essential to the growth of plants. Fertilisers supply nitrogen, phosphorous, and potassium (NPK).
Fertilisers are classified into four groups:
1. Nitrogenous fertilisers: They contain nitrogen as the major nutrient.
2. Phosphatic fertilisers: They contain phosphate or phosphorus as the major nutrient.
3. Potassic fertilisers: They contain potassium as the major nutrient.
4. Complex fertilisers: They contain a combination of multiple nutrients.
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संबंधित प्रश्न
What are macro-nutrients and why are they called macronutrients?
Why are manures and fertilizers used in fields?
Give two limitations of using manure.
Explain various methods of fertilizer application
Write about three main criteria which should be considered while selecting the crops for rotation?
Classify plant diseases depending upon their occurrence and transmission.
What are crop's pests? Suggest preventive measures to control pests.
Explain what will happen if in a cultivated field only manures are supplied and in another field only fertilizers are supplied, keeping all other conditions similar.
Compare between mixed cropping and intercropping. Write down from advantage of both of these techniques.
Discuss the various methods which are used to control plant diseases.
