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What makes farms vulnerable to erosion?
Mostly annual plants are planted as crops; tiling the soil leaves dirt loose; livestock overgraze; crops are often planted in rows
What is the difference between annual plant root length and perennial root length?
Annual plants have shallow roots; Perennial plants have long roots that keep the soil in place
What is the problem with crops being planted in lines?
Creates a line for water to run off in while carrying the soil with it
What nutrients do plants need from the soil? How much of each nutrient is needed?
Macronutrients (large amounts), secondary macronutrients (medium amounts), micronutrients (small amounts)
What is soil compaction?
The compression of soil by either natural weight of overlaying sediments or human-related forces
Are there bad side effects to using synthetic fertilizers? If so, what are they?
Yes. They leach into drinking water, they runoff into waterways and cause algae blooms
What is eutrophication?
Depletion of oxygen in the water from massive decomposition of algae in water
What is the problem to mostly annual plants being planted as crops? What is the solution?
Problem: They don't hold very much soil in place
Solution: Add some perennials to the crops
What is the problem with tiling the soil? What is the solution?
Problem: Leaves dirt loose and vulnerable to being blown away
Solution: No till agriculture
What is the problem with livestock overgrazing? What is a solution?
Problem: Decrease in plant growth
Solution: Limit the amount of time grazers spend on a plot of grass
What is pivot farming?
Crops planted on flat surfaces. Reduces runoff because runoff is caught in all directions by crops
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