41.5. Water Retention Characteristics

Try these first

1. 1.

   What is the Soil Moisture Characteristic Curve?

   Hint

   Think about what happens to water retention as moisture levels change.

2. 2.

   Define hysteresis in the context of soil.

   Hint

   Consider how soil behaves differently when wet versus when dry.

3. 3.

   What does the Soil Moisture Characteristic Curve represent?

   • A relationship between water flow and soil type
   • A relationship between soil moisture and matric suction
   • A fixed value of soil moisture at saturation

   Hint

   Think about what you’ve learned regarding moisture retention capacity.

4. 4.

   Hysteresis occurs due to differences in retention while:

   • True
   • False

   Hint

   Consider the impact of temporal soil conditions.

5. 5.

   You have clay and sandy soil samples. Design a procedure to measure their retention curves and identify the impact of hysteresis.

   Hint

   What equipment will you need and how will you analyze the data?

6. 6.

   How would you utilize hysteresis data to improve irrigation practices in a crop field with varying soil textures?

   Hint

   Think about water needs and how different soils hold moisture.