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Explanation:
1
The hydroponics definition states that it is the cultivation of plants in water. It is a subcategory of hydroculture and is a useful technique of growing plants without soil. ... Furthermore, through this method, one can grow plants in liquid, sand or gravel by simply adding some nutrients to it.
2 That is, if a farmer's land yields only a quarter of what it takes to feed the family, one possible fix is to apply more fertilizer, or plant legumes to deliver a crop that also adds nitrogen to the soil.