Excessive use of pesticides leads to a sharp decline in the number of earthworms in a field. What effect does this have on the soil as a result?
Decrease in soil fertility
To understand the impact of excessive pesticide use on soil fertility, particularly through the decline in earthworm populations, let's explore the role of earthworms in soil ecosystems.
- Role of Earthworms: Earthworms are critically important for maintaining soil health. They help in breaking down organic matter, which in turn improves nutrient availability in the soil, aiding in the decomposition process and enhancing soil structure.
- Effect on Soil Fertility: A decline in earthworm populations leads to reduced decomposition of organic matter, lesser humus formation, and consequently, a decrease in soil fertility. This is because earthworms help mix layers of the soil, allowing for proper aeration, moisture, and nutrient mixing, which are vital for plant growth.
- Excessive Pesticide Use: When excessive pesticides are used, they can be toxic to earthworms, disrupting their population. The sharp decline in earthworms can result in compaction of the soil, reduced aeration, and diminished nutrient cycling, all leading to a decrease in soil fertility.
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Justification of Answer: Given the critical role of earthworms in maintaining healthy, fertile soil, the correct option here is "Decrease \, in \, soil \, fertility." The other options do not apply as effectively:
- Improved aeration: Without earthworms, soil tends to compact, reducing aeration.
- Increase in water retention: Soil compaction from lack of earthworm activity generally decreases water retention.
- Enhanced decomposition: Decomposition is reduced without earthworms to process the organic material.
Therefore, the decrease in the number of earthworms due to excessive pesticide use results in a decrease in soil fertility.
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