Which of the following is likely to minimize soil erosion?
a. High-yield crops
b. Deforestation
c. Herbicide use
d. Annual plowing
e. No-till agriculture
The Correct Answer and Explanation is :
The correct answer is e. No-till agriculture.
Explanation:
Soil erosion occurs when the top layer of soil is removed by wind, water, or human activity, leading to the degradation of soil quality and loss of vital nutrients. There are several farming practices that influence the rate of soil erosion, and no-till agriculture is one that significantly minimizes it.
No-till agriculture is a farming practice where the soil is not plowed or disturbed before planting. Instead of tilling the soil to prepare it for planting, seeds are directly sown into the undisturbed soil, using specialized equipment. This method offers several benefits for soil conservation:
- Soil Structure Preservation: Tilling the soil can break up the soil structure and cause compaction, which makes it more prone to erosion. By not disturbing the soil, no-till agriculture helps maintain its natural structure, allowing better water infiltration and root penetration.
- Erosion Reduction: Tillage exposes soil to the elements, especially wind and rain, which can easily wash or blow the soil away. No-till practices leave the soil covered by crop residues (like stalks and leaves), which act as a protective barrier, reducing the impact of rain and wind on the soil.
- Increased Organic Matter: By not tilling the soil, crop residues decompose on the surface, adding organic matter back into the soil, which further improves soil structure and helps retain moisture. This also encourages a healthier soil ecosystem, with increased microbial activity that helps bind the soil particles together.
- Improved Water Retention: No-till agriculture increases the water-holding capacity of the soil, as the surface is more likely to retain moisture, which reduces runoff and the likelihood of erosion.
In contrast, practices like annual plowing (d) and deforestation (b) disturb the soil and remove vegetation, both of which increase erosion. Herbicide use (c) can damage plant cover that helps hold the soil in place. High-yield crops (a) do not inherently reduce erosion, and without appropriate soil management practices, they could actually lead to soil degradation.
Thus, no-till agriculture is the most effective method listed to minimize soil erosion.