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Unformatted text preview: 367 g / cm3 2. You have landed a job managing an exclusive golf course in Palm Springs after successfully completing Soil
Science 10. The average evapotranspiration rate for the Southern California Desert in August is 0.9 cm/day.
It is recommended to irrigate when one-half (50%) of the available water in the soil has been depleted. The
turf on your course is rooted to a depth of 30 cm in a sandy loam soil. Using these irrigation criteria and the
accompanying graph, determine how often you should irrigate. cm of H2O per 100 cm of soil 40
30 Field Capacity 25
0 Permanent Wilting Point
sa y loa lt loa y loa
sa y cla Starting facts:
Rate of water loss = 0.9 cm / day
Irrigate when 50% of the available water is gone
30 cm rooting zone
Sandy loam texture
Available water holding capacity = field capacity – pwp
AWHC = 18 – 6 = 12 cm H2O/100 cm soil
A 30 cm rooting zone will have an AWHC of: 12 cm x 0.30 = 3.6 cm H2O
You will irrigate when 50% of this is gone: 3.6 cm...
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- Fall '13