Container Plant Irrigation Considerations
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Transcript of Container Plant Irrigation Considerations
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Container PlantIrrigation Considerations
Tom YeagerDepartment of Environmental Horticulture
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Apply Irrigation Uniformly as the Amount Needed
Application AmountDistribution Uniformity
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What impacts the uniformity of delivery?
Overhead sprinkler
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Design: spacing
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)
1.0 12 3.4
2.0 12 0.1
4.0 12 0.0
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R em ove obstructions
inside and in front
of em itters
Remove obstructions
inside and in front
of emitters
Maintenance
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Monitor uniformity and application amount
Monitor uniformity and
application amount
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53566166
47495761
42435053404148
81616 5149
48 49
56
57 49
61
61
66
43
41
50 53
47
53
40
42
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53566166
47495761
42435053404148
81616 5149
48 49
56
57 49
61
61
66
43
41
50 53
47
53
40
42
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Calculation for Uniformity
40+41+42+43 = 166 = 414
Distribution Uniformity Overall average (ml)
Low quarter average (ml)=
0.80 = 80% DU=4151
166
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Convert Volume to Application Depth
Average volume applied =
= 0.9 cm
Cup area = 3.14 x 4.25 2 = 57 cm2
51 ml or cm3
= 0.4 inch2.54 cm/ inch
0.9 cm
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= 0.4 inch51 ml or cm3
57 cm2
51 cm3
57 cm2
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Determine distribution of water over the areaAmount applied per duration of irrigation
Application AmountDistribution Uniformity
http://edis.ifas.ufl.edu/ep458
Summary
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Match Water Demand with Application Amount
Overhead sprinkler
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Are there differences inwater demand?
Species
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Salmon’s Nursery, FLPodocarpus 0.33Rhaphiolepis 0.35Rosa 0.38Loropetalum 0.39Ilex 0.44 Rhododendron 0.47Viburnum 0.53
0.14
Saunder’s Nursery, VARhododendron 0.32Spiraea 0.33Weigela 0.35Hydrangea 0.38Gardenia 0.39 Berberis 0.50
0.07
Plant water demand or loss (inch/container)July August3- gal
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Can you manage for the species differences?
Are there differences inwater demand?
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Calculation for Uniformity
Overall average (inch)
Low quarter average (inch) Distribution Uniformity
=
0.65 = 65% DU=0.260.40
0.40 – 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 inwater demand?
Species
Spacing
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Spacing (inch)0369
Water loss (inch)0.300.330.360.400.10
Container Water Loss for 3-gal Ligustrum
Spacing (inch)0246
Water loss (inch)0.320.380.420.450.13
June July
Million and Yeager, SNA 2013
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Spacing 0 inch 5.5 inch 11 inch 16.5 inch
% Cover 95 52 35 24
Wt. loss (g) 400 520 ( 30%) 570 ( 45%) 610 ( 50%)
ETc (inch) 0.25 0.33 0.36 0.39
Light interception per
plant
Temp.
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20
40
60
80
100
120
Substrate - Wide Spacing
Substrate - Close Spacing
Air
Tem
per
atu
re (
F)
Jan 10 Jan 11 Jan 12 Jan 13
Hourly measurements
Dwarf Yaupon 1-Gallon 2013
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Are there differences inwater demand?
Species
Spacing
Size
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Plant Water Demand Affected by Plant Size1-gal Viburnum - spring planting
0 14 28 42 56 70 84 98 1120.0
0.2
0.4
0.6
0.8
1.0
0
2
4
6
8
10
12
14
16
18
20
Water loss
Size index
Day
Wat
er l
oss
(in
ch) S
ize ind
ex (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
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
Salmon’s Wholesale Nursery
Southwest Florida Water Management District