advantages and disadvantages of crop rotation
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Answers:regenerates the soil.
Answers:C. Rotating nitrogen fixing legume crops with non-legume crops each year.
Answers:CRP is still used throughout the midwest. There are government subsidies for farmers who take advantage of it. This typically involves a period of 3-5 years where the land is left alone to become overgrown with native plants, as well rotating the cycles of cash crops as you mentioned.
Answers:Advantage: Pests which spread diseases (think mosquitoes) are eliminated. Crops are preserved. Disadvantage: Pesticides are poisonous and need to be regulated... unregulated pesticides kill humans and animals. Also, pesticides don't distinguish between bad pests (ie - aphids) and helpful pests (ie - ladybugs or bees).