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IRRIGATION SCHEDULING IN DRIP SYSTEMS. Dr. Ron Goldy Michigan State University Extension. Dr. Mathieu Ngouajio, MSU Department of Horticultural Science. Dr. Jeff Andresen, MSU Geography Department. Supported by funds from GREEEN and SWMREC Grants. How Much Water Is Enough?. - PowerPoint PPT Presentation
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IRRIGATION SCHEDULING IN DRIP SYSTEMS
Dr. Ron Goldy
Michigan State University Extension
Dr. Mathieu Ngouajio, MSU Department of Horticultural Science
Dr. Jeff Andresen, MSU Geography Department
Supported by funds from GREEEN and SWMREC Grants
How Much Water Is Enough?
When Is The Best Time To Apply It?
How Much?
10, 15, 20, 25, 30, 35 centibars
cb Total Yield
Yield No.1
% Total
Fruit Wt.
Yield No.2
% Total
Yield Small
% Total
Yield Cull
% Total
15 3483 2142 62 322 454 13 507 15 380 11
10 3271 2059 64 316 433 13 454 14 324 10
20 3140 2046 64 310 421 13 412 13 261 8
25 2877 1395 48 291 394 14 681 24 407 14
lsd 510 566 13 ns ns ns ns 9 ns 5
Yield of ‘Mt. Spring’ tomato in 25 pound cartons from four soil moisture levels (5280 plants/acre).
Yield of ‘Greensleeves’ cucumber in 1-1/9 bushels/acre from four soil moisture levels.
Cb Total Yield
Yield No.1
% Tota
l
Yield
No.2
% Tota
l
Yield
Cull
% Tota
l
15 797 558 70 108 14 131 16
10 752 488 64 135 19 128 17
20 707 412 58 146 19 149 23
25 347 193 53 30 9 124 34Lsd0.0
5231 201 ns 97 ns ns 17
10
3.66”/wk
3.29”/wk
1.55”/wk
0.42”/wk
1520
25
Conclusions:
Cucumber and tomato yield was significantly affected when soil moisture dropped to 25 centibars
No yield differences were found between application of 1.5”/week (20 cbs) or 3.5”/week (10 cbs)
When?
Does Irrigation Time Influence Yield?
IIV IIIII IV
7:00am, 12-noon, 5:00pm, 10:00pm, 10:00am (control)
Irrigation
Time
Total
Yield
Yield No. 1
% Tota
l
Yield No. 2
% Total
Yield Cull
% Total
12 noon 1041 380 37 206 18 455 45
5:00 pm 891 311 36 177 19 403 45
10:00 am
797 308 39 176 22 312 39
10:00 pm
771 302 39 157 20 311 40
7:00 am 704 244 34 146 21 315 45
Lsd0.05 334 98 ns ns ns ns ns
Yield in 1-1/9 bu/a of ‘Greensleeves’ slicing cucumber.
Irrigation Time
Total Yield
Yield No.1
% Total
No.1
Fruit
Wt.
Yield
No.2
% Tota
l
Yield Crat
e
% Total
Yield
Cull
% Total
10:00 am
2093 1166 56 349 345 16 185 9 397 19
5:00 pm 2069 1217 59 334 274 13 213 10 365 1712 noon 2043 1196 59 336 316 15 194 9 336 1610:00
pm1890 1032 55 349 336 18 213 11 309 16
7:00 am 1791 942 52 346 284 16 205 11 359 20Lsd0.05 ns 146 6 ns ns 4 ns ns ns ns
Yield in 25# cartons of ‘Mountain Spring’ tomato.
Irrigation Start Time
1-foot 2-foot 3-foot
7:00 am 1.56 1.57 1.45
10:00 am 1.72 1.39 1.31
12 noon 1.92 1.86 1.82
5:00 pm 1.74 1.49 1.49
10:00 pm 1.57 1.66 1.68
Lsd0.05 0.23 0.25 ns
Seasonal average soil moisture levels in a drip irrigated cucumber planting.
Moisture Level (inches/foot)
Irrigation Start Time
1-Foot 2-Foot 3-Foot
7:00 am 1.53 1.54 1.56
10:00 am 1.38 1.28 1.44
12 noon 1.51 1.46 1.43
5:00 pm 1.40 1.35 1.60
10:00 pm 1.53 1.34 1.24
Lsd0.05 ns ns 0.29
Moisture Level (inches/foot)
Seasonal average soil moisture levels in a drip irrigated tomato planting.
12 noon 1.92 1.86 1.82
12 noon
1.51 1.46
1.43
Conclusion:
Irrigating during moisture depletion appears best“Banking” water is not beneficial (or possible?) in a sandy soil
Commercial Plantings:
Monitored weekly
61 sites
Without scheduling
With scheduling
DRIP-LINE FAXLETTER
A fax newsletter from the Southwest Michigan Research and Extension Center 2004 Vol. 1 No. 1
Welcome to DRIP-LINE. This one-page newsletter will be faxed as part of the weekly reporting of the monitoring stations in your plantings. Each week it will include predicted evapotranspiration values used to estimate water needs for the coming week. It will also include brief articles to help you make irrigation management decisions to aid in efficient water application. If you have any questions concerning content or have a specific item you would like addressed, please contact Ron Goldy at 269-944-1477 ext207, 269-208-1651 (mobile) or [email protected].
Estimated evapotranspiration values for June 22 to June 29. High temperatures over the next week are only expected to be in the low to mid 70s with partly cloudy conditions. This is five to ten degrees below normal which leads to evapotranspiration rates of 0.2 to 0.22”. If temperatures or sun conditions differ from the predicted, make adjustments up or down accordingly.
