Irrigation Requirements Arboriculture HORT 350 Spring 2001.
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Irrigation Requirements Arboriculture HORT 350 Spring 2001
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Transcript of Irrigation Requirements Arboriculture HORT 350 Spring 2001.
Irrigation Requirements
Arboriculture
HORT 350
Spring 2001
Arboriculture Irrigation Requirements• Terms:
– water potential (Ψ, kPa, MPa)– Field capacity– Permanent wilting point– Available water– macropores, micropores– crop coefficient
Arboriculture Irrigation Requirements• Field Capacity ~0.03
MPa– amount of water held against the force of
gravity; usually measured 24 h after irrigation
• Permanent Wilting Point ~1.5 MPa– amount of water resulting in wilting from
which plant will not recover; developed for agronomic crops
Arboriculture Irrigation Requirements/Harris et al. 1999
~30 kPa
~1500 kPa
Arboriculture Irrigation Requirements/Harris et al. 1999
0
20
40
60
80
100
Loamy sand Sandy loam Fine sandyloam
Loam Clay loam
FC-PWPAWReadily AW
mm water/ 600 mm soil
Arboriculture Irrigation Requirements/Harris et al. 1999
0
2
4
6
8
10
12
14
Sandy loam Silt loam Clay loam
CoverBare
Infiltration rate (mm/h)
Arboriculture Irrigation Requirements/Harris et al. 1999
Water content
Saturated
Time (min)
Arboriculture Irrigation Requirements/Transplanting
0
5
10
15
20
25
0 10 20 30
ControlWindLightAnti-TsBag
Water Loss (mg/cm2) Water Lily
Arboriculture Irrigation Requirements/Harris et al. 1999
June
December
Arboriculture Irrigation Requirements/Las Cruces, NM
0
2
4
6
8
10
12
January
FebruaryMarch
April MayJune
JulyAugust
September
October
November
December
PptPET
Inches
Dr. Death’s Tree Care Guide Alfalfa Irrigation Requirements
0
2
4
6
8
10
12
14
16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Alfalfa-nonstressedPET (in)
Water (in/mo)
0
2
4
6
8
10
12
14
16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Pecan-nonstressedPecan-maintenancePET (in)
Dr. Death’s Tree Care Guide Pecan Irrigation Requirements
Water (in/mo)
Dr. Death’s Tree Care Guide Afghan Pine Irrigation Requirements
0
2
4
6
8
10
12
14
16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Pine-nonstressedPine-maintenancePET (in)
Water (inmo)
Dr. Death’s Tree Care Guide
Las Cruces’ Tree Water Requirements
0
20
40
60
80
Alfalfa
Redbu
d
Pur. L
f Plu
mAsh
Locus
t
Pecan
Vitex
Mul
berr
y
Salt C
edar
Afghan
Pin
e
Mim
osa
Juni
per
Non-stressedMaintenanceSurvival
Water Use (in/yr)
After Sammis & Jerigan 1992
Arboriculture Irrigation Requirements/Sammis
Species Water Use(in/d)
Rel. Ts.(%)
Species WaterUse(in/d)
Rel.Ts.(%)
Alfalfa .54 100 Pecan .26 53
Redbud .39 78 Mulberry .21 40
Ash .33 66 Sycamore .20 39
Locust .31 61 Afghan pine .15 29
Poplar .29 59 Juniper(Hollywood)
.13 26
Dr. Death’s Tree Care Guide
Las Cruces’ Tree Water Requirements
Ash Pecan Afghan JuniperMonth PET(in) [Irrigation needs (in/mo)]
Jan/Dec 3.06 0.5 0.5 1.0 0.5
Feb/Nov 4.04 1.3 1.3 2.0 2.0
Mar/Oct 6.46 3.0 3.0 3.0 3.0
Apr/Sep 8.65 5.0 4.0 4.0 3.5
May/Aug 9.44 6.0 5.0 4.5 4.0
Jun/Jul 10.42 10.0 8.0 6.0 5.0
Year 83.70 51.6 43.6 41.0 36.0
Dr. Death’s Tree Care Guide
Las Cruces Water Requirements
• Crown diameter = 15 ft• Well diameter = 10 ft• Ratio = 1.5:1
• Crown area = 177 ft2
• Well area = 79 ft2
• Ratio = 2.2:1
How much water does my tree really need?
Therefore, if my tree needs 1” of water, I need to supply 2.2” to the well.
Arboriculture RainBird ‘DriWater’ Irrigation Supplement
• Slow release water over 90 d (but check within 45-60 d)
• Cost $3/ea• Use:
– 1 gal = 2- 4– 5 gal = 4- 8– 15 gal = 11-16– 24” B&B = 18-20
