Estimating Soil Moisture by Feel and Appearance Unit: Soil Science Lesson 6.

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Presentation transcript:

Estimating Soil Moisture by Feel and Appearance Unit: Soil Science Lesson 6

Objectives Define: irrigation water management, available water capacity, percent available, soil moisture deficit, in/ft depleted Explain the significance of irrigation water management Explain key factors that impact observations made in the feel and appearance method Differentiate between percent available water capacities in different soil types Obtain a soil sample using a probe, auger or shovel Squeeze the soil sample firmly to form an irregularly shaped “ball” of soil Squeeze the soil sample out of the hand between the thumb and forefinger to form a soil “ribbon” Observe the soil texture, ability to ribbon, firmness and surface roughness, water glistening, loose soil particles, soil/water staining on fingers and soil color Compare observations with photographs and/or charts to estimate percent water available

Define Irrigation water management: is applying water according to crop needs in an amount that can be stored in the plant root zone of the soil. Available water capacity: is the amount of water that a soil can store that is available for use by plants Percent available: currently available soil moisture as a percent of available water capacity Soil moisture deficit: is the amount of water in a soil that can be readily absorbed by plant toots of most crops in/ft depleted: Inches of water currently needed to refill a foot of soil to field capacity

Why is it important to properly manage irrigation water?

Irrigation water management determines: How much water is available for plant use When to irrigate How much irrigation water to apply Soil and irrigation water conservation