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LTD User Manual Soil type
Clay
VSM(dry)
15
VSM(wet)
50
VSM(Optimal)
32.5
The following examples show 7 days with various daily ET and rain in combination with start off of dry, wet or optimal soil condition with 0%, 50% or 100% regulation. The examples have the following common conditions:
• Soil type loam. Root zone 4”. This means the VSM for dry, optimal and wet corresponds to 0.24”, 0.84” and 1.44” of water.
• The first irrigation period begins with ET=0.20, Rain=0.00”, ET balance = 0.00”.
• The irrigation program runs every day if ET balance is above 0.00” (no minimum/maximum ET defined.)
• Allow and prevent irrigation based on the moisture is not used.
• The water applied by irrigation and rain reach the root zone the same day.
Factor %
VSM %
ET
ETm
0
6 (dry)
0.20
0.20
0
21 (optimal)
0.20
0.20
0
36 (wet)
0.20
0.20
50
6 (dry)
0.20
0.30
50
21 (optimal)
0.20
0.20
50
36 (wet)
0.20
0.10
100
6 (dry)
0.20
0.40
100
21 (optimal)
0.20
0.20
100
36 (wet)
0.20
0.00
123