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Welcome to Basic Soil-Plant-Water Relationships!

In order to understand how to apply and manage water effectively ina plant's root zone, you will need to understand the basicrelationships between the soil, the plant, and the water.

The tutorials can be viewed as many times as needed. However, youmust view every tutorial all the way through in order to receive creditfor completing the "activity". It will be marked as complete with acheck mark in the box to the right of the tutorial name after you havefinished watching it all the way through. Most tutorials contain one ormore self-quiz questions that must be answered correctly before youcan continue with the video. You can answer as many times as you

need to get it right -- These questions are there to make sure you understand the concepts! To helpyou take notes or follow along, you can download and print the "Tutorial Notes" for each video, or theglossaries for each module.

Tutorials

Objectives - Basic Soil-Plant-Water Relationships (1:48)

Glossary - Basic Soil-Plant-Water Relationships

Soil Water Terminology

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Soil Moisture Content

We will first discuss concepts related to the amount of moisture inthe soil. We will cover terms such as saturation, field capacity,permanent wilting point, and others, so that we have a commonvocabulary to talk about how the plant uses the water in the soil,and how to make sure the moisture is adequately replaced.

Soil Moisture Content (9:15)

Tutorial Notes - Soil Moisture Content

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Available Water Holding Capacity (AWHC)

One of the most important soil-water terms is the Available WaterHolding Capacity (AWHC). This is the amount of water in the soilthat is actually available for the plants to use.

Available Water Holding Capacity (11:09)

Tutorial Notes - Available Water Holding Capacity

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Managing the Water in the Soil

The MAD is the percentage of the AWHC that the plants will beallowed to use before the irrigator refills the soil profile. A closelyrelated term is SMD, which is the depth of moisture depletion fromfield capacity. Both terms are used when deciding when and howmuch to irrigate.

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Final Exam

MAD: Management Allowable Depletion (2:46)

Tutorial Notes - MAD

Selection of MAD (7:29)

Tutorial Notes - Selection of MAD

Soil Moisture Depletion (2:46)

Tutorial Notes - Soil Moisture Depletion (SMD)

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Soil Water Potential (SWP)

Water "potential" is a measure of the water energy level in the soil orplant. A good knowledge of water potential can help you understandhow plants take up water, as well as how much available water ishelpd by the soil.

Soil Water Potential (5:22)

Tutorial Notes - Soil Water Potential

Ready to Take the Exam?

The final exam will only be visible under this image after allactivities in this module are marked as complete. In other words,once you have viewed all of the tutorials all the way through, andthere is a check mark in the box to the right of each tutorial name.

When the exam becomes available, you will have 3 opportunitiesto pass the exam with a 70% or better. If you do not pass the exam on the first attempt,you can review any of the tutorials, if you like, and try again. You will not need to watch allthe tutorials again! Once you begin the exam, you can't exit it. So please make sure thatyou are comfortable with the materials presented in this module before starting the exam.

This exam is timed. You will have 30 minutes to complete 15 questions.

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