1. Potato Irrigation Management Xi Liang Aberdeen Research & Extension Center, Aberdeen, ID 83210

2. Crop Water Relations http://ga.water.usgs.gov/edu/watercycleevapotranspiration.html http://www.usbr.gov/pn/agrimet/chart/abeich.txt ETr = transpiration + evaporation ETc = ETr * Kc

3. Crop Water Use http://www1.agric.gov.ab.ca/$Department/deptdocs.nsf/all/agdex13571

4. Irrigation Management - ET Early termination: irrigation applied until the beginning of late bulking 100/70/50% ET: early bulking - tuber initiation / mid bulking / late bulking Yield loss from irrigation reduction, and deficit irrigation does not work well in potatoes. J.C. Stark, S.L. Love, B.A. King, J.M. Marshall, W.H. Bohl and T. Salaiz. 2013. Potato Cultivar Response to Seasonal Drought Patterns. Am. J. Potato Res. 90:207-216.

5. Irrigation Management – ET Potato Root Growth http://preuniversity.grkraj.org/html/4_PLANT_AND_WATER_RELATIONSHIP.htm http://nuearthllc.com/id1.html http://www.potatogrower.com/Article.aspx?year=2013&month=08&article=2805

6. Irrigation Management – Soil Moisture B.A. King and J.C. Stark. Potato irrigation management.

7. Irrigation Management – Soil Moisture Y. Kang, F. Wang, H. Liu, and B. Yuan. 2004. Potato evapotranspiration and yield under different drip irrigation regimes. Irrigation Science 23:133-143. Irrigation was applied only when the soil matric potential reached the targeted values: 15, 25, 35, 45, and 55 kPa at 0.2m. Optimal yield

8. Irrigation Management - Canopy Temperature S.A. O'Shaughnessy and S.R. Evett. 2010. Canopy temperature based system effectively schedules and controls center pivot irrigation of cotton. Agricultural Water Management 98:1310-1316. Irrigations were triggered only after canopy temperatures > 28°C for more than 452min accumulated in a 24h period.

9. Irrigation Management - Canopy Temperature Pp. 207-213 In C.R. Camp, E.J. Sadler, and R.E. Yoder (eds) Evapotranspiration and Irrigation Scheduling. Proc. International Conf., San Antonio, TX. 1996. ASAE, St. Joseph, MI. Treatments: > 28°C over a 15 min interval > 30°C over a 15 min interval > 28°C for more than 4 h on the 3 rd day after irrigation > 30°C for more than 4 h on the 3 rd day after irrigation 100% ET weekly 67% ET weekly

10. Irrigation Management - Canopy Temperature Infrared thermometer http://www.cell.com/trends/plant-science/fulltext/S1360-1385(11)00209-3 Thermal imaging

11. Summary Crop water relations: ET and crop coefficient Irrigation management: ET Soil moisture threshold Canopy temperature threshold