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प्रश्न
Give a short account of biofertilizers.
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उत्तर
Organisms that increase the nutrient content of the soil are called as bio-fertilisers. They are nitrogen-fixing microorganisms used for specific crop plants such as pulses, legumes, oil seeds, and rice. They can play a supplementary role in supplying nitrogen to specific crops under specific soil conditions. They do not pollute and can be renewed.
Example: Rhizobium is a bio-fertiliser used by farmers who grow pulses, legumes, etc.
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संबंधित प्रश्न
How do plants get nutrients?
Choose plant’s micronutrients and macronutrients from the following Iron, Chlorine, Sulphur, Copper, Nitrogen, Calcium, Manganese, Potassium, Zinc, Magnesium, Molybdenum, Phosphorus.
Explain the term eutrophication with suitable example
How does chemical nature of the soil change due to continued use of chemical fertilizers ?
Explain various methods of fertilizer application
Define manure. What are different manures and how do they affect the soil ?
What is green manuring ? Give suitable examples for green manures.
Why is irrigation essential ?
How does excessive irrigation lead to soil salinity ?
Mention three different ways in which insect pests can attack the crop plant.
