Apes

Based on the data in the graph, which of the following illustrates the approximate percent increase in total water withdrawals between 1970 and 2010 ?

36

Based on the data in the graph, which of the following proposed solutions would have the greatest effect on reducing global water withdrawals?

A coordinated public information campaign in rural...

If the trend in total water withdrawal represented in the graph continues, which of the following is most likely to happen in the future

Aquifers will be depleted if demand is higher that recharge rate

Which of the following is the correct order of soil particles in order of increasing size?

Clay-silt-sand

...is the loss of more than 10% of soil productivity in arid areas due to such factors as erosion, soil compaction, overgrazing, and forest removal.

Desertification

This type of irrigation is often used by small scale farming operations with 95% efficiency it adds water directly to soil so less is wasted

Drip

This type of irrigation, often used in orchards growing tree crops, distributes water to plants through small parallel channels between crop rows but often leads to increased soil erosion in the field.

Furrow

Which of the following properties is most likely associated with soils that contain more sand-sized particles than soils that contain more clay-sized particles?

High permeability

A farm is experiencing extensive crop loss due to high rains causing overly saturated soils. Which of the following approaches would best help the farmer alleviate the problem?

Improving the soil with sand to increase the permeability of the soil

Alternating bands of different types of vegetation planted

Intercropping

The soil pictured in Figure 8-4 is a

Loam

...is the federal agency responsible for preventing soil erosion and protecting waterways in agricultural areas of the United States.

Natural resources conservation service (NRCS)

The fundamental geological material for soils in a particular area

Parent material

Which of the following techniques is a realistic solution for farmers to decrease the amount of fertilizer and sediment runoff into aquatic ecosystems?

Practicing crop rotation

The O horizon

Primarily composed of organic material

Irrigation can result in the salinization of soils because...

Salts in the water are deposited on the soil surface as water evaporates

What are the proportions of sand, silt, and clay for the soil at point T

Sand 60%, silt 30%, clay 10%

Based on the soil texture triangle, which of the following would describe soil that was 25%clay,25% silt, and 50%sand?

Sandy clay loam

Corn is a crop that grows best in soil that drains well. Which of the following soils is best suited to grow corn?

Sandy loam because it has large amounts of sand and less than 20% clay

The planet loses 5 to 7 million hectares of productive cropland per year to...

Soil degradation

Which of the following problems is best addressed with contour plowing?

Soil erosion

This type of irrigation uses a large system of sprinklers that must be manually moved from field to field and has very large evaporative losses.

Spray

Which of the following is the best method for preventing soil erosion in an agricultural area?

Terrace farming

The Dust Bowl of the early 1930s led to the creation of...

The soil conservation act

Shelterbelts are to ... as terraces are to ...

Wind erosion, water erosion

Irrigation can result in the salinization of soils because...

salts in the water are deposited on the soil surface as water evaporates

Factors involved in soil formation include...

weathering of parent material and the addition of organic material