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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 advantages of using manure ?
How does chemical nature of the soil change due to continued use of chemical fertilizers ?
Distinguish between farmyard manure and compost manure.
Why water should be used judiciously ?
Distinguish between mixed cropping and intercropping.
Classify plant diseases depending upon their occurrence and transmission.
Explain various effects of weeds on crop plants.
Distinguish between fertilizer and manure. Give suitable examples. What are advantages and disadvantages of using fertilizer?
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.
