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Container Plant Irrigation Considerations Tom Yeager Department of Environmental Horticulture

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Apply Irrigation Uniformly as the Amount Needed Application Amount Distribution Uniformity

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What impacts the uniformity of delivery? Overhead sprinkler

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Design: spacing

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Take into account slope 2.31 ft = 1 psi Design: pressure

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Pressure loss due to friction for 100 ft Sch. 40 PVC pipe Design: pressure Pipe Size (inch) Flow (GPM) Press. Loss (PSI)

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Remove obstructions inside and in front of emitters Maintenance

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Monitor uniformity and application amount

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Calculation for Uniformity = 166 =41 4 Distribution Uniformity Overall average (ml) Low quarter average (ml) = 0.80= 80% DU =

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Convert Volume to Application Depth Average volume applied = = 0.9 cm Cup area =3.14 x = 57 cm 2 51 ml or cm 3 = 0.4 inch 2.54 cm/ inch 0.9 cm

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= 0.4 inch 51 ml or cm 3 57 cm 2 51 cm 3 57 cm 2

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Determine distribution of water over the area Amount applied per duration of irrigation Application Amount Distribution Uniformity Summary

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Match Water Demand with Application Amount Overhead sprinkler

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Are there differences in water demand? Species

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Salmons Nursery, FL Podocarpus0.33 Rhaphiolepis0.35 Rosa0.38 Loropetalum0.39 Ilex0.44 Rhododendron0.47 Viburnum Saunders Nursery, VA Rhododendron0.32 Spiraea0.33 Weigela0.35 Hydrangea0.38 Gardenia0.39 Berberis Plant water demand or loss (inch/container) July August 3- gal

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Can you manage for the species differences? Are there differences in water demand?

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Calculation for Uniformity Overall average (inch) Low quarter average (inch) Distribution Uniformity = 0.65= 65% DU = – 0.14 = 0.26 Overall Average – variation between species = number to exceed so sprinkler variation does not overcome species variation

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Are there differences in water demand? Species Spacing

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Spacing (inch) Water loss (inch) Container Water Loss for 3-gal Ligustrum Spacing (inch) Water loss (inch) June July Million and Yeager, SNA 2013

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Spacing 0 inch 5.5 inch11 inch 16.5 inch % Cover Wt. loss (g) ( 30%)570 ( 45%)610 ( 50%) ETc (inch) Light interception per plant Temp.

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Dwarf Yaupon 1-Gallon 2013

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Are there differences in water demand? Species Spacing Size

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Plant Water Demand Affected by Plant Size 1-gal Viburnum - spring planting Day Water loss (inch) Size index (cm)

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Match Water Demand Overhead sprinkler With Application Amount Species Spacing Size

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Capture Factor (CF) = Volume captured

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Canopy Affects Capture of Irrigation and Rain

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Match Water Demand Overhead sprinkler With Application Amount Species Spacing Size Capture Factor

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How Do We Use This and Other Information? Match Water Demand with Application Amount

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Thanks for Your Support! Center for Applied Nursery Research Florida Nursery, Growers and Landscape Association Saunders Brothers Nursery Salmons Wholesale Nursery Southwest Florida Water Management District

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