Depth Of Water Stored In Root Zone In Filling Soil Up To Field Capacity Calculator

Formula Used:

\[ d_w = \frac{\Gamma_d \times d \times F}{\Gamma_w} \]

The Dry Unit Weight of Soil (Γd):

kN/m³

Root Zone Depth (d):

The Field Capacity of Water (F):

Unit Weight of Water (Γw):

kN/m³

Depth of Water Stored in Root Zone (d_w):

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1. What is Depth of Water Stored in Root Zone?

The depth of water stored in the root zone represents the amount of water that can be held within the soil profile accessible to plant roots when filled to field capacity. This is a critical parameter in irrigation planning and water management for agricultural systems.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ d_w = \frac{\Gamma_d \times d \times F}{\Gamma_w} \]

Where:

\( d_w \) — Depth of water stored in root zone (m)
\( \Gamma_d \) — Dry unit weight of soil (kN/m³)
\( d \) — Root zone depth (m)
\( F \) — Field capacity of water
\( \Gamma_w \) — Unit weight of water (kN/m³)

Explanation: This formula calculates the equivalent depth of water that the soil can hold at field capacity within the root zone, considering the soil's dry unit weight and the unit weight of water.

3. Importance of Water Storage Calculation

Details: Accurate calculation of water storage capacity in the root zone is essential for efficient irrigation scheduling, preventing water stress in crops, optimizing water use efficiency, and managing soil moisture for optimal plant growth.

4. Using the Calculator

Tips: Enter dry unit weight of soil in kN/m³, root zone depth in meters, field capacity value, and unit weight of water in kN/m³ (default is 9.807 kN/m³). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is field capacity?
A: Field capacity is the amount of water remaining in soil after it has been thoroughly saturated and allowed to drain freely, usually for one to two days.

Q2: Why is dry unit weight used instead of bulk density?
A: Dry unit weight provides the weight of soil solids per unit volume, excluding water content, which is essential for accurate water storage calculations.

Q3: How does root zone depth affect water storage?
A: Deeper root zones can store more water, providing greater water availability for plants and reducing irrigation frequency requirements.

Q4: What is the typical range for field capacity values?
A: Field capacity values typically range from 0.1 to 0.4 depending on soil texture, with higher values for clay soils and lower values for sandy soils.

Q5: How can this calculation help in irrigation planning?
A: This calculation helps determine the maximum amount of water that can be stored in the root zone, guiding irrigation amounts and timing to maintain optimal soil moisture levels.