Question

concept | explain how these improve soil fertility
crop rotation |
green manure |
adding limestone |

mc practice:
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

which of the following problems is best addressed with contour plowing?
a eutrophication
b denitrification
c the pesticide treadmill
d soil erosion
e soil salinization

summarize the key takeaways from the video.

Explanation:

First MC Question (Minimize Soil Erosion)

To determine which option minimizes soil erosion, we analyze each:

• A. High - yield crops: Focus on yield, not erosion control.
• B. Deforestation: Removes vegetation, increases erosion.
• C. Herbicide use: Kills plants, reduces ground cover, increasing erosion.
• D. Annual plowing: Disturbs soil, makes it more prone to erosion.
• E. No - till agriculture: Leaves soil undisturbed, keeps crop residues, reducing erosion.

Contour plowing is for soil erosion on slopes. Analyze options:

• A. Eutrophication: Related to nutrient pollution, not addressed by contour plowing.
• B. Denitrification: A nitrogen - cycling process, not related.
• C. The pesticide treadmill: About pesticide use, not related.
• D. Soil erosion: Contour plowing slows water runoff on slopes, reducing erosion.
• E. Soil salinization: Related to salt buildup, not addressed by contour plowing.

Answer:

E. No - till agriculture

Second MC Question (Best Addressed by Contour Plowing)