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Evi chaps 9-10
Terms in this set (23)
make the plant toxic to insects that feed on
them, but also harm bees that pollinate the plant and predator insects that feed on the pests; also enter the soil and water supply, killing other organisms that pose no threat to crops
Can organic agriculture support the world population?
Yes, only if food waste and meat consumption are
reduced, and technology improves.
Partially-decomposed organic matter
Soil with an even mixture of each particle is called
<.002 mm particles
.05-2 mm particles
between clay and sand in size
loamy, dark color, "not clumpy" texture, intermediate pH level
occurs when irrigation oversaturates the soil to the point where water drowns plant roots, depriving them of gases and suffocating them; problem with irrigation
the buildup of salts in surface soil layers; problem with irrigation
a mixture produced when decomposers break down organic matter in a controlled environment.
being caused by Nitrogen and phosphorus runoff causing phytoplankton blooms in coastal regions
the practice of monitoring soil nutrient levels and only applying fertilizer when it is needed.
add fertilizer directly to their water, releasing it only above the plant roots.
Soil Conservation Act of 1935
established an agency that worked with farmers to combat erosion.
alternates the type of crop grown from one season to the next.
plow sideways across a hillside
the creation of level platforms on very steep terrain slows water erosion.
involves planting alternating bands of different crops.
rows of trees or shrubs that serve as windbreaks.
reduces the amount of plowing, since it leaves soil surfaces bare and exposed to wind.
Farmers leave crop residues behind, keeping the soil covered with plant material year-round.
Conservation Reserve Program
pays farmers to
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\convert damaged cropland to conservation reserves
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