drip irrigation - great plains growers conference€¦ · drip irrigation joseph m. hannan...
TRANSCRIPT
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Drip Irrigation Joseph M. Hannan
Commercial Horticulture Field Specialist Serving Central and Western IA Iowa State University Extension
28059 Fairground Rd. Adel IA
[email protected] 515.993.4281 – office
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System Basics
• Require planning • Irrigation response varies by crop
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Advantages
• Low pressure + Low volume = Low energy • Small or large fields • Water in root zone
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Components
• Source • Backflow prevention • Pressure regulator • Filter • Header • Drip tape
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Components
• Example 1
• Example 2
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Drip Tape
• Tape
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Drip tube
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Drip Tape
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Drip Tape 24” to 36”
wetting width
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Wetted Radius
24 to 32 inch 16 to 18 inch 4 to 6 inch
Wetted radius from emitter line source
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Emitter spacing
• 6 inch • 12 inch • 18 inch • 24 inch
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Emitter spacing
• 6 inch - 12 inch – Leafy greens – Onions – Beats – Brassicas
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Emitter spacing
• 18 inch - 24 inch – Solanaceous – Cucurbits – Brassicas
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Emitter Spacing
12 inch spacing • 100 ft x 0.5 gph x 1 hour
– 100 x 0.5 x 1 = 50 gallons
24 inch spacing • 100 ft x 0.5 gph x 1 hour
– 50 x 0.5 x 1 = 25 gallons
• 100 ft x 0.5 gph x 2 hour – 50 x 0.5 x 2 = 50 gallons
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Emitter flow rate
• <.25 gph • 0.25 gph • 0.34 gph • 0.50 gph • 0.75 gph
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Zoning
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Zoning
1
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Zoning
2
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Zoning
3
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Pull it all together
Example 1 • 30x90 ft high tunnel
– 6 rows
• 12 inch emitter spacing • 0.75 gph emitter
• 90x6x0.75 = 405 gph
Example 2 • 30 x 90 ft high tunnel
– 6 rows
• 18 inch emitter spacing • 0.25 gph emitter
• 60x6x0.25 = 90 gph
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Scheduling
• When to turn on pump?
• How long to run pump? – (volume of water to apply)
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When Do I irrigate?
• Plant appearance = poor – See curling of leaves, wilting
• Soil appearance = better • Soil moisture meters = good
– Watermarks – Tensiometers
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Soil Moisture Tools
Tensiometer
Watermark
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Black plastic mulch
Shallow Tensiometer
Plant
Tensiometer Placement
Deep Tensiometer
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Bottom of root zone
½ of root zone
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Tensiometer Set Points (cbars) Soil
Texture Field
Capacity* 25%
Depletion* Sandy loam 5 - 10 10 - 15
Loams 10 - 15 20 - 30
Silt loams 15 - 20 25 - 35
Clay loams 25 - 40 40 - 50
* No irrigation required
* Of the AWC in effective root zone
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Length
Wetted radius
Crop Wetted Volume
Row Feet
Wetting radius
Rooting depth
Soil Type
Bath Tub Approach
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Crop Rooting Depth
Shallow (6-12”)
Moderate (18-24”)
Deep (> 36”)
Broccoli Greens Onion
Snap beans Pepper
Cabbage Cucumber
Muskmelon Eggplant
Potato Tomato
Asparagus Lima Bean
Watermelon (seeded)
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Soil Water Holding Capacity
Soil Texture
Inches/foot
Sands 0.5 – 1.0
Sandy loam 1.0 – 1.5
Loams 2.0 – 2.5
Silt loams 2.5
Clay loams 2.0 – 2.5
WHC at field
capacity.
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Math Time!
• Need to know – Row feet – Wetting radius – Rooting depth – Soil type – 27,000 gals / acre inch – 43560 sq ft / acre
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Soil Moisture
Time
Soil
Moi
stur
e Vegetative
Fruit maturation
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Fertigation
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Summary
• Low flow, low pressure system • Plan/zone your system • Scheduling • Fertigation
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Questions?
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Questions?