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प्रश्न
What are fertilizers ? Classify fertilizers.
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?
Compare the use of manure and fertilizers in maintaining soil fertility.
What are advantages of using manure ?
How does chemical nature of the soil change due to continued use of chemical fertilizers ?
Explain advantages of irrigation.
Write down disadvantages of crop rotation.
Give two examples each of
(a) Narrow leaved rabi season weed.
(b) Broad leaved kharif season weed.
What are crop's pests? Suggest preventive measures to control pests.
Explain various types of irrigation systems in India. How can efficiency of applied water be increased in agriculture.
Discuss the various methods which are used to control plant diseases.
