What is the primary source of water for soil?

• Atmospheric moisture

• Groundwater

• Surface water

• All of the above

Which of the following is not a classification of soil water based on availability to plants?

• Gravitational water

• Capillary water

• Hygroscopic water

• Precipitation water

What is the term for the water that drains freely through the soil under the influence of gravity?

• Capillary water

• Hygroscopic water

• Gravitational water

• Absorbed water

Which soil water classification is most readily available to plant roots?

• Gravitational water

• Capillary water

• Hygroscopic water

• Adsorbed water

What is the term for the water held tightly by the soil particles and not available to plants?

• Gravitational water

• Capillary water

• Hygroscopic water

• Adsorbed water

Which factor plays a significant role in determining soil water retention?

• Soil texture

• Soil color

• Soil temperature

• Soil topography

What role does organic matter play in soil water retention?

• Increases water retention

• Decreases water retention

• Has no effect on water retention

• Only affects gravitational water retention

Which of the following is not a factor affecting soil water movement?

• Soil structure

• Soil permeability

• Soil salinity

• Soil porosity

What is the term for the water that plants can absorb directly from the soil?

• Capillary water

• Gravitational water

• Hygroscopic water

• Available water

In soil water terminology, what does the field capacity refer to?

• The maximum water content a soil can hold

• The water content of soil after excess water drains away

• The water content of soil at saturation

• The water content of soil at permanent wilting point