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प्रश्न
Classify nutrients according to their sources.
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उत्तर
Nutrients are classified into three groups according to their sources.
| Source | Nutrients | |
| 1. | Air | Carbon (C) and oxygen (O) |
| 2. | Water | Hydrogen (H) |
| 3. | Soil | Nitogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulphur (S), iron (Fe), manganese (Mn), boron (B), zinc (Zn), copper (Cu), molybdenum (Mo), and chlorine (Cl) |
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संबंधित प्रश्न
How does chemical nature of the soil change due to continued use of chemical fertilizers ?
Give a short account of biofertilizers.
Explain why a legume crop does not require nitrogenous fertilizers ?
Why water should be used judiciously ?
Explain, how efficiency of irrigation can be increased.
Write about three main criteria which should be considered while selecting the crops for rotation?
Explain the methods of controlling insect pests.
Give two examples each of
(a) Narrow leaved rabi season weed.
(b) Broad leaved kharif season weed.
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.
Differentiate between the following
Mixed cropping and Intercropping
