Vineyard Irrigation Scheduling

Calculate gallons of irrigation water per vine per week based on evapotranspiration rate, vine growth stage, and spacing for precision vineyard water management.

Inputs

ET Rate

in/day

Growth Stage

Vine Spacing

Tab to move between fields

Results

Gallons per Vine per Week

11 gal

≈ 11 milk jugs

Deficit Irrigation Target

8.8 gal/vine/week

Growth StageBloom / Canopy Development

Gallons per Vine per Day1.57 gal

Gallons per Acre per Week13,306 gal

Acre-Inches per Week0.49 ac-in

Crop Coefficient (Kc)0.7

Drip Runtime (1 GPH emitter)1.6 hrs

Irrigations per Week3

How to Use This Calculator

Enter ET Rate, Growth Stage, and Vine Spacing.
Review Gallons per Vine per Week (gal) and Deficit Irrigation Target (gal/vine/week).
Use Growth Stage and Gallons per Vine per Day (gal) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Vine Spacing

Vine Spacing	Gallons per Vine per Week	Deficit Irrigation Target
3.9	4.6 gal	3.7 gal/vine/week
6.15	11.6 gal	9.2 gal/vine/week
8.85	23.9 gal	19.1 gal/vine/week
11	37 gal	29.6 gal/vine/week

What each input means

ET Rate: Reference evapotranspiration (ETo) in inches per day from local weather station or CIMIS data. Typical summer ET: 0.15-0.35 in/day.
Growth Stage: Vine growth stage: 1 = Budbreak (April), 2 = Bloom / Canopy Development (May-June), 3 = Veraison (July-Aug), 4 = Harvest / Post-Harvest.
Vine Spacing: Distance between vines within a row in feet. Used to estimate the area served by each vine's root zone.

How this is calculated

Worked example, using the default values

Identify Input Parameters
ET Rate = 0.2, Growth Stage = 2, Vine Spacing = 6 = 3 input(s) provided
Calculate Gallons per Vine per Week
Gallons per Vine per Week
11 = 11
Calculate Deficit Irrigation Target
Deficit Irrigation Target
8.8 = 8.8
Calculate Growth Stage
Growth Stage = stage.name
Bloom / Canopy Development = Bloom / Canopy Development
Calculate Gallons per Vine per Day
Gallons per Vine per Day
1.57 = 1.57

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