Ian McCann

1
S1018 Annual report
Delaware
Ian McCann
2
Irrigation system evaluations
3
(No Transcript)
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
Coefficient of Uniformity (CU) 94
8
Coefficient of Uniformity (CU) 69
9
(No Transcript)
10
Sprinkler flow and endgun issues
11
(No Transcript)
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
Center-pivot evaluations in Delaware 2004-2007
Summary of Coefficient of Uniformity n178
18
Irrigation system evaluations
Drip irrigated watermelon
19
Irrigation rate study
2004
2005 and 2006
2007
Irrigation 1-3/week. Same amount per irrigation
except 167.
Irrigation 2-4/week. All treatments on same
schedule.
0 ET (0x)
1/week 33 ET (1x)
50 ET (1x)
50 ET (1x)
100 ET (2x)
2/week 67 ET (2x)
100 ET (2x)
150 ET (3x)
3/week 100 ET (3x)
150 ET (3x)
250 ET (5x)
3/week 167 ET (5x)
20
Relative yield vs relative irrigation rate
2004-2007
21
Mulched drip irrigated watermelon
Transpiration
Plastic mulch
Evaporation
Bare soil
76 cm
240 cm
22
Multi-sensor Capacitance Probe (MCP)
23
MCP locations
10 cm
Center
20 cm
Edge
30 cm
Fringe
Center
50 cm
Fringe
70 cm
Edge
Sensors
24
(No Transcript)
25
Soil water content during July at 20 cm at the
edge position under low irrigation
2006
2007
26
Soil water content from 10-13 July 2006 at 20 cm
at the edge position under low irrigation
Day
Day
Day
Night
Night
27
Daytime and nightime change in SWC in 70 cm
profile, 67 Irrigation in 2007
Irrigation day
Irrigation day
28
Daily decrease in SWC summed at center, fringe
and edge positions on the first day following an
irrigation, compared with ET0 on that day.
2007, 67 Irrigation
2007, 33 Irrigation
29
Irrigation system evaluations
Drip irrigated watermelon
Center-pivot irrigated corn
30
Corn Irrigation using center-pivot
31
Corn Irrigation using center-pivot
Irrigations to replace ET
Daily
2 Days
3 Days
Single frequency MCP
10 cm
10 minutes
20 cm
Dual frequency MCP
30 cm
30 minutes
50 cm
70 cm
32
(No Transcript)
33
(No Transcript)
34
(No Transcript)
35
Example 10 minute stacked graph data 10, 20, 30,
50 and 70 cm
36
Irrigation system evaluations
Drip irrigated watermelon
Center-pivot irrigated corn
Irrigation scheduling
37
(No Transcript)
38
Irrigation scheduling scenarios
Leave some space for rain
Try different rainfall and irrigation
possibilities
39
(No Transcript)
40
Generic logger and transmitter
Sensors (such as Capacitance)
41
(No Transcript)
42
(No Transcript)
43
Irrigation system evaluations
Drip irrigated watermelon
Center-pivot irrigated corn
Irrigation scheduling
Sub-surface drip irrigated corn
44
Dripline
Center
5 ft
15 in
45
(No Transcript)
46
(No Transcript)
47
Soil water content by depth at Center position
Rainfall
48
(No Transcript)
49
Soil water content at 10, 20, 30, 50 and 70 cm
measured at dripline location
50
Soil water content at sensor above (30 cm) and
below (50 cm) the dripline depth of 38 cm
51
Irrigation system evaluations
Drip irrigated watermelon
Center-pivot irrigated corn
Irrigation scheduling
Sub-surface drip irrigated corn
International (ICARDA in Syria)
52
Monthly mean rainfall and ET0 at ICARDA
headquarters in Tel Hadya, Syria
53
Renewable water resources per capita. 1440
m3/yr in 2004 lt 1000 m3/yr in 2025
54
Area irrigated by groundwater has increased 360
in past 25 years (870,000 ha in 2005)

• Groundwater recharge is small (lt 10 of
  precipitation.)
• Groundwater levels at ICARDA have declined from
  71 m (1984) to 105 m (2007)

55
Example of soil water content simulation
56
Thank you