Question
Explain how fertilisers are different from manure .
| Manure | Fertiliser |
| Manure is a natural substance obtained by the decomposition of animal wastes like cow dung, human waste and plant residues. | Fertiliser is a man-made inorganic salt which contains necessary plant nutrients. |
| Manure is relatively less rich in plant nutrients. | Fertiliser contains a rich amount of nutrients like nitrogen, phosphorus and potassium in concentrated form. |
| Manures are prepared in the field by decomposing wastes. | Fertilisers are prepared in the factories |
| Manure provides humus to the soil in large amount. | Fertiliser does not provide any humus to the soil. |
| Manures are not soluble in soil, therefore absorbed by plants at a very slow rate. | Fertilisers are highly soluble in water and readily absorbed by the plants. |
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| Column I | Column II | ||
| $(i)$ | Polyester | $(a)$ | Prepared by using wood pulp |
| $(ii)$ | Teflon | $(b)$ | Used for making parachutes and stockings |
| $(iii)$ | Rayon | $(c)$ | Used to make non-stick cookwares |
| $(iv)$ | Nylon | $(d)$ | Fabrics do not wrinkle easily |