Don't say dirt
It's what's for dinner!
Pests and pets
The Cycles of Life
Water 'bout it + LD50
100
As you travel from the O-horizon to the C-horizon the levels of nutrients in the soil... (increase or decrease)
decrease
100
The practice of planting crops with the shape of a hillside, resulting in reduced soil erosion and increased water retention
Contour plowing
100
CAFO stands for this
Concentrated Animal Feedlot Operation
100
This biogeochemical cycle does not have an atmospheric component
Phosphorous
100
How do irrigation practices lead to salinization?
salts are left behind after irrigated water evaporates, saltwater intrusion in coastal areas can also contribute
200
As you travel from the O-horizon to the C-horizon the soil becomes _(more or less)__ like the parent material...
more
200
Green manure involves planting cover crops and incorporating them into the soil. Benefits of this include (list two)...
Adding nutrients, erosion control, attracting pollinators
200
This is one major downsides of overuse of pesticides in agriculture
Pesticide resistance, harming non-target species, EDCs in our food
200
Humans are currently altering the carbon cycle through these practices
Deforestation, fossil fuel extraction, burning fossil fuels
200
Which irrigation method has the smallest negative impact on water use and erosion?
drip irrigation
300
Which soil texture likely has the highest percolation rate?
Sand
300
Two disadvantages in the practice of monoculture include these
decreased genetic diversity, increased risk of disease/pests, soil degradation, poor pollinator health
300
Livestock operations are less efficient than farming traditional crops because they use more of this.
Land
300
What are 2 sinks/reservoirs of water in the hydrological cycle (other than the ocean)
groundwater, rivers, lakes, polar ice caps, glaciers
300
Which substance has the highest toxicity?
Paclitaxel
400
What soil texture is a sample with 40% silt, 30% sand and 30% clay
Clay loam
400
This practice involves burning down areas of forest and using using the resulting ash to enrich the soil. This is common in tropical regions.
Slash-and-burn
400
One major downside of CAFOs would be this
antibiotic overuse (which leads to resistance), increased greenhouse gas emissions, increased grain prices, disease spread, eutrophication (from waste)
400
Livestock practices impact the carbon cycle by the release of these two carbon based compounds
CO2 and CH4 (methane)
400
The germination rate of radish seeds in the presence different concentrations of salt was studied. 600 seeds were planted in the study.
After 3 days, the 3% concentration had 500 germinated seeds, the 4% concentration had 450 germinated seeds, the 5% concentration had 376 germinated seeds, the 6% concentration had 300 germinated seeds and the 7% concentration had 225 germinated seeds. What is the LC50?
6% the concentration that killed 50% of the population (300/600)
500
Another name for the A-horizon AND 2 things it contains
Top-soil. Contains: Humus, minerals, worms, microbes
500
Erosion is harmful to agricultural land because it removes nutrient rich topsoil. Two practices that reduce soil erosion include...
windbreaks, crop rotation, cover crops
500
An example of a cultural control for integrated pest management would be this.
strip cropping, crop rotation, changing irrigation methods, changing planting time
500
Humans are currently altering the phosphorous and nitrogen cycles through the use of what?
What is one disadvantage of this practice?
fertilizers. disadvantage: pollution (water and soil), eutrophication, lowered soil quality over time, cost
500
This central U.S. aquifer is being depleted by agricultural practices that draw water faster than it can be recharged
Ogallala Aquifer