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Question
Complete the following table with reference to the soil.
| Action | Effect | Result (w.r.t. fertility) |
| Construction of embankments | ||
| Wind speed decreased | ||
| Farmland is kept fallow for some period | ||
| Humus content increased. | ||
| Trenches are dug across a slope | ||
| Litter is burnt on the farm. | ||
| Proves favorable for micro-organisms | ||
| The salt content in the soil increases | ||
| Chemical fertilizers used excessively |
Solution
| Action | Effect | Result (w.r.t. fertility) |
| Construction of embankments | Reduction in the erosion of soil due to heavy rains. | Increase in Fertility |
| Planting trees | Wind speed decreased | Increase in Fertility |
| Farmland is kept fallow for some period | The fertility of soil gets maintained. | Increase in Fertility |
| Use of organic manures | Humus content increased. | Increase in Fertility |
| Trenches are dug across a slope | Check over the velocity of water running along the slopes and hence reduction in soil erosion | Increase in Fertility |
| Litter is burnt on the farm. | The proportion of ash in the soil gets increased. | Decrease in Fertility |
| Use of organic manures | Proves favorable for micro-organisms | Increase in Fertility |
| Excessive irrigation | The salt content in the soil increases | Decrease in Fertility |
| Chemical fertilizers used excessively | Decrease the number of microorganisms and so the proportion of humus in the soil | Decrease in Fertility |
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