SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Fertile soil is created when sediment and nutrients are deposited
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Weeds would be wiped out and prevent overpopulation.
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Harmful pesticides would be washed off of crops.
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None of the above
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Detailed explanation-1: -Agriculture: Floodwaters carry nutrients and sediments, which are deposited on flood plains, enriching the soil.. Rice paddies are flooded deliberately to take advantage of this natural fertilization process.
Detailed explanation-2: -Effects of Flooding Flooding also reduces the soil redox potential, increases the pH of acid soils (largely because of a change of Fe3+ to Fe2+), and decreases the pH of alkaline soil (mainly because of CO2 accumulation which eventually forms H2CO3).
Detailed explanation-3: -Today, farmers add numerous soil amendments to enhance soil fertility, including inorganic chemical fertilizers and organic sources of nutrients, such as manure or compost, often resulting in surplus quantities of primary macronutrients.
Detailed explanation-4: -In the long-term, however, floods are considered as an important factor in the process of soil formation and a source of enhancing soil productivity due to deposition of fresh alluvium, which is free of excessive soluble salts and rich in minerals, especially potassium (K).