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IRRIGATION SCHEDULING IN DRIP SYSTEMS

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?.

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IRRIGATION SCHEDULING IN DRIP SYSTEMS

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  1. IRRIGATION SCHEDULING IN DRIP SYSTEMS Dr. Ron Goldy Michigan State University Extension

  2. Dr. Mathieu Ngouajio, MSU Department of Horticultural Science Dr. Jeff Andresen, MSU Geography Department Supported by funds from GREEEN and SWMREC Grants

  3. How Much Water Is Enough? When Is The Best Time To Apply It?

  4. How Much? 10, 15, 20, 25, 30, 35 centibars

  5. Yield of ‘Mt. Spring’ tomato in 25 pound cartons from four soil moisture levels (5280 plants/acre).

  6. Yield of ‘Greensleeves’ cucumber in 1-1/9 bushels/acre from four soil moisture levels.

  7. 10 3.66”/wk 15 3.29”/wk 20 1.55”/wk 25 0.42”/wk

  8. 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)

  9. When?

  10. Does Irrigation Time Influence Yield? IV I II III IV

  11. 7:00am, 12-noon, 5:00pm, 10:00pm, 10:00am (control)

  12. Yield in 1-1/9 bu/a of ‘Greensleeves’ slicing cucumber.

  13. Yield in 25# cartons of ‘Mountain Spring’ tomato.

  14. Seasonal average soil moisture levels in a drip irrigated cucumber planting. Moisture Level (inches/foot)

  15. Seasonal average soil moisture levels in a drip irrigated tomato planting. Moisture Level (inches/foot)

  16. 12 noon 1.92 1.86 1.82

  17. Conclusion: Irrigating during moisture depletion appears best “Banking” water is not beneficial (or possible?) in a sandy soil

  18. Commercial Plantings: 61 sites Monitored weekly

  19. Without scheduling With scheduling

  20. 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 goldyr@msue.msu.edu. 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.

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