Test 2

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

Percent of water that’s ocean water. Ice? all other water? ground water?

Back (Answer)

97.25% 2% <0.05% 0.7%

Front (Question)

percent lake water? Soil moisture? Atmosphere? Rivers

Back (Answer)

60% 33% 6% 1%

Front (Question)

What are two restrictions of water movement?

Back (Answer)

Rate of water supply from soil to root. Rate of loss from leaves through evaporation.

Front (Question)

Evapotranspiration is affected by?(5)

Back (Answer)

Radiant energy- 540 calories to evaporate 1g water. Atmospheric vapor pressure Temperature wind soil moisture supply

Front (Question)

Different crops lose moisture at different rates(T/F)

Back (Answer)

True

Front (Question)

Transpiration ratio-

Back (Answer)

kg of water needed to produce 1kg of dry weight.

Front (Question)

Water vapor losses from soil surface and plants are determined by(4)

Back (Answer)

Climate Plant cover Water use efficiency Length and season of plant growing period

Front (Question)

Ways to control soil evaporation?

Back (Answer)

Encourage soil cover Mulches Paper plastic mulches- high cost/high value crops crop residue and conservation tillage- requires herbicide use.

Front (Question)

Percolation-

Back (Answer)

subsurface drainage, downward movement of water through soil. -loss of soluable salts

#10

Front (Question)

runoff-

Back (Answer)

surface drainage

#11

Front (Question)

Leaching losses

Back (Answer)

loss of fertilizer soil and water pollution problems abated through split applications of fertilizers.

#12

Front (Question)

infiltration-

Back (Answer)

absorption of water by soil

#13

Front (Question)

If rate of rainfall exceeds rate of infiltration what happens?

Back (Answer)

soil ponding or surface runoff occurs.

#14

Front (Question)

Land drainage occurs in what two regions?

Back (Answer)

Delta and flat coastal plains.

#15

Front (Question)

Ex. of subsurface drains?(3)

Back (Answer)

Mole drain-lasts one season Perforated plastic pipe- 90% of todays systems Clay tile drains- to expensive for ag. popular 20-30 years.

#16

Front (Question)

Benefits of drainage?(5)

Back (Answer)

reduces frost brewing helps soils warm up faster in spring Aeration easier to work fields Maintains productivity of irrigated soils.(no salting out)

#17

Front (Question)

Perc test is used for what? how do you do one?

Back (Answer)

to determine percolation test. and determine solubility for a septic tank drainfield. measure water in a hole over time.

#18

Front (Question)

Aeration-

Back (Answer)

process of maintaining a supply of O2 to the soil

#19

Front (Question)

Oxygen is important why?

Back (Answer)

respiration organic matter decay release organic nutrients(N,F,S) reducing toxicities of elements( Mn and S)

#20

Front (Question)

Diffusion-

Back (Answer)

random motion of molecules from an area of high concentration to an area of low concentration.

#21

Front (Question)

Partial pressure-

Back (Answer)

the pressure a gas would exert if it alone were present in volume occupied by a mix.

#22

Front (Question)

Factors affecting diffusion-

Back (Answer)

Texture- Structure- Water Content-

#23

Front (Question)

Texture-

Back (Answer)

finer textures soils have more micropores

#24

Front (Question)

Structure-

Back (Answer)

introduces large pores into fine textured materials.