Modules 1 - 5: Quizzes Flashcards
agricultural land comprises what percent of our ice-free global land area?
37%
rank the top 3 categories of agricultural crops based on land area harvested
- cereals
- oilcrops
- fruits, veggies, and nuts
the core principle to sustainable agriculture is?
balancing the triple bottom line
on a global basis, human withdrawls of water exceed losses due to evapotranspiration on an annual basis.
false
a ___ is the land that water flows across or under on its way to a river, lake, stream, or bay. water travels over farm fields, forests, suburban lawns, and city street, or it seeps into the soil and travels as _____
watershed; groundwater
label
- nutrients from the land run off into the pond
- excess nutrients cause algae to bloom
- dying algae sink to the bottom of the pond
- bacteria consume the decaying algae
- oxygen is used up by the bacteria
- low oxygen “dead” zones harm other aquatic life
in the process of eutrophication, which step involves the production of oxygen?
algae grow, algal blooms form
wet weather events are required for ___ whereas _____ are a source rain or shine
nonpoint source pollution
point source pollution
point source pollution remains the largest source of impairment to the waters of the united states
false
the vegetable and agronomic crops BMP manual published by FDACS was reviewed and edited entirely by growers and farmers.
false
non-point sources of pollution can be controlled through
BMP
information on soils is important for:
- nutrient management
- pesticide management
- wetland delineation
- land use planning
- mapping current drought conditions
what single soil forming factor has the greatest impact on predicting soil types on landscapes (continental) scale
climate
a soil’s texture is determined by the amount of
sand, clay, and silt
rank the 3 mineral particle-size designations in order of increasing coarseness (smallest = 1 and largest = 3)
- clay
- silt
- sand
during a drought, most plants are water stressed. under these conditions, what primarily fills soil pore space?
air
during a flood, most plants are oxygen deprived. under these conditions, what primarily fills soil pore space?
water
what type of soil takes years to drain water out?
clay
which soil type has the largest surface area?
clay
which soil type is dominated by micropores?
clay
when drained, which container is likely to have soil characterized by macropores filled with air?
sand
when drained, which container is likely to have the highest water content at field capacity?
clay
according to the our world in data article, which plant group dominates global arable land use by area?
cereal crops
globally, we use less land per person to grow cereal crops in 2014 than we did in 1961
true
