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Soil Water – AGRI 345-02 – Summary Notes and Practice Question

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This document summarizes key topics from AGRI 345-02 on soil and water dynamics, including how water moves through soil, infiltration processes, water retention, and water movement. It includes structured summaries and multiple-choice practice questions with correct answers clearly marked. The content focuses on soil texture, porosity, permeability, water potential, and hydraulic concepts. Ideal for test prep or reinforcing lecture material.

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Samantha Wilson Y




AGR 345-02
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Soil Water
·0 How Water Moves Through Soil
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Summary: Soil is composed of sand, silt and clay which all provide different abilities for
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water passage throughout the soil as a whole. The texture, structure and gravity influence how the
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Ywater moves. Soil is also composed of macro and micro pores which water will move in and out
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of when they are connected to one another. Depending on the percentage of either sand, silt or cla
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y will control the hydrology and how healthy the soil is for different uses.
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1. is how easy something moves through soil (A)
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A.Permeability

B. Infiltration

C.Conductivity

D. Saturation

2. As particle size
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Y Y (C)

A.decreases; increases Y




B. decreases; decreases Y




C.increases; decreases Y




D.increases; increases Y




3. What is the percent of air or open space between the particles?
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A.Permeability

B. Porosity

C.Saturation

D.Infiltration

4. is the amount of sand, silt, or clay soil particles. (A)
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A.Texture

, B. Structure

C.Porosity

D.Saturation

5. What are the two forces that guide water through soil? (D)
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A.Capillary and Infiltration Y Y




B. Capillary and Hydrolic Y Y




C.Gravitational and Hydrolic Y Y




D.Gravitational and Capillary Y Y




·1 Visualizing Soil Properties: Water Infliltration
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Summary: Soil infiltration refers to the soil’s ability to allow water movement into and th
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rough the soil profile. It allows the soil to temporarily store water, making it available for uptake
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by plants and soil organisms. Infiltration rates are a measure of how fast water enters the soil and
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are typically expressed in inches per hour.
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1. The maximum rate is known as: (B)
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A.Infiltration Rate Y




B. Infiltration Capacity Y




C.Rate Capacity Y




D. Rate Intensity Y




2. Rapid movement towards the channel is: (A)
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A.Overland Flow Y




B. Overland Infiltration Y




C.Infiltration Flow Y




D. Infiltration Rate Y




3. is the attraction of soil surfaces for water molecules. (D)
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A. Infiltration

B. Retention

C.Cohesion

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