Notes:  This is a selection of publications from the last five years.  For previous publications, please click here.  Please contact the unit secretary or the author for reprints of articles.

Christen, E.W., Huggins, C. and Ayars, J.  (2002) Rethinking sub-surface drainage.  Farmers Newsletter, Horticulture No. 186 Winter 2002, p15-17.

Ayars, J.E., R.W. Soppe, and A. Marani. 2002. Reducing irrigation in the presence of shallow ground water using the COTTON2K model. Proceedings 18^th Congress of ICID, Montreal, Canada, July 21-28, 2002. CD-ROM

Ayars, J.E., E.W. Christen. 2002. Best management practices for subsurface drainage system design and management in irrigated agriculture. Proceedings of USCID Conference on Helping Irrigated Agriculture adjust to TMDL’s. October 23 - 25, 2002, Sacramento, CA. pg.187- 196.

Ayars, J.E. and R.W. Soppe. 2002. Irrigation scheduling of cotton with FDR probes in the presence of shallow saline ground water. Proceedings of First International Symposium on Soil Water Measurement using Capacitance, Impedance and Time Domain Transmission (TDT). ed. I. Paltineanu. Beltsville, Md. Pg. Nov. 6-8 . CD publication Paltin International, Laurel, Md.?

Soppe, R.W., J.E. Ayars, and M.E. Grismer. 2002. Using FDR to measure soil water in lysimeters  with shallow saline ground water,  Proceedings of First International Symposium on Soil Water Measurement using Capacitance, Impedance and Time Domain Transmission (TDT). ed. I. Paltineanu. Beltsville, Md. Nov. 6-8 CD publication. Paltin International, Laurel, Md.?

Johnson, R.S., J.E. Ayars, and T. Hsiao. 2002. Modeling young peach tree evapotranspiration. Acta Horticulturae 584, Proc. 6^th International Symposium on Modeling in Fruit. Ed. T.M. DeJong. pg 107-113.

Hanson, B.R. and J.E. Ayars. 2002. Strategies for reducing deep percolation in irrigated agriculture.  Irrigation and Drainage Systems 16(4):261-277.

Soppe, R.W. and J.E. Ayars. 2002. Crop water use by safflower in weighing lysimeters. Ag Water Management.  60(59-71).

Johnson, R.S., J. Ayars, and T. Hsiao. 2002. Modeling young peach tree evapotranspiration. Proceedings of 6^th IS on Modeling in Fruit. Acta Hort. 584:107-113..

Ayars, J.E. 2003. Irrigation systems operation. Encyclopedia of Agricultural and Food Engineering. ed. D.R. Heldman. Marcel Dekker, Inc.70 Madison Avenue, New York, NY 10016. On-line publication pr. 546-548.

Ayars, J.E., R.S. Johnson, C.J. Phene, T.J. Trout, D.A. Clark, and R.M. Mead. 2003.  Crop water use by late season drip irrigated peaches. Irrig. Sci. 22:187-194. 

Ayars, J.E. 2003. Pre-plant irrigation. Encyclopedia of Water Science. Eds. B.A. Stewart and T.A. Howell. Marcel Dekker, Inc.70 Madison Avenue, New York, NY 10016. On-line publication  pg 498-501.

Ayars, J.E. 2003. Drainage of irrigated land. Encyclopedia of Water Science. Eds. B.A. Stewart and T.A. Howell. Marcel Dekker, Inc.70 Madison Avenue, New York, NY 10016. On-line publication pg135-137   ?

Ayars, J.E. 2003. Field crop production in areas with saline soils and shallow saline ground water in the San Joaquin Valley of California. Chapter in Crop Production in a Saline Environments:Global and Integrative Perspectives , eds S.S. Goyal, S.K. Sharma, and W. Rains. Haworth Press, pg 353-386.

Corwin, D., S. Lesch, P. Shouse, R.W. Soppe, and J.E. Ayars. 2003. Identifying soil properties that influence cotton yield using soil sampling directed by apparent soil electrical conductivity. Agron. J. 95:352-364.

Bryla, D.R., T.J. Trout, J.E. Ayars, R.S. Johonson. 2003. Growth and production of young peach trees irrigated by furrow, microjet, surface drip, or subsurface drip systems. Hortscience. 38(6): p. 1112-1116.

Christen, E., J.  Blackwell, J.  Hornbuckle, and J.  Ayars.  2003.  Waterlogging and salinity-management by subsurface drainage.  Natural Resource Management.  Special Issue, The Australian Association of Natural Resource Management. June pg.  41-51. 

Ayars, J.E., R.W.Soppe, E.W. Christen, W. Meyer. 2003. Drainage research needs for water management in saline environments. Paper 032083, Presented ASAE International Meeting, Las Vegas, NV. July 27-30. 17 pgs.

Ayars, J.E., R.W. Soppe, E.W. Christen, and J.W. Hornbuckle. 2003. Managing salinity for sustainability of irrigation in areas with shallow saline ground water. 9^th International Drainage Workshop, Utrecht, Netherlands.

Soppe, R.W.O., J.E. Ayars, E.W. Christen, and P.J. Shouse. 2003. Irrigation management to optimize controlled drainage in a semi-arid area. 9^th International Drainage Workshop, Utrecht, Netherlands. 

Christen, E.W., J.W. Hornbuckle, S. Herath, J.E. Ayars, and R.W.O. Soppe. 2004. Integrating EM survey, soil sampling, and water table data to manage subsurface drainage for salt discharge reduction: A case study. International Commission on Irrigation and Drainage, 2^nd Asian Regional Conference, 14-17 March, Echuca Australia. CD publication.

Johnson, R.S. J. Ayars, and T. Hsiao. 2004. Improving a model for predicting peach tree evapotranspiration. IVth IS on Irrigation of Hort. Crops. Acta Hort:664 ISHS pp 341-346.

Kelleners, T.J., R.W.O. Soppe, D.A. Robinson, M.G. Schaap, J.E. Ayars, and T.H. Skaggs. 2004. Calibration of Capacitance probe sensors using electric circuit theory. Soil Sci. Soc. Am. J. 68:430-439.

Vaughan, P.J., P.J. Shouse, S. Goldberg, D.L. Suarez, and J.E. Ayars. 2004. Boron transport within an agricultural field:Uniform flow versus mobile-immobile water model simulations. Soil Science Vol 169, No. 6 pp 401-412

Kelleners, T.J., R.W.O. Soppe, J.E. Ayars, and T.H. Skaggs. 2004 Calibration of capacitance probe sensors in saline silty clay soil.  Soil Sci. Soc. Am. J. 68:770-778.

Buyuktas, D., W.W. Wallender, R.W. Soppe, J.E. Ayars, and B. Sivakumar. 2004 Calibration and validation of a three-dimensional subsurface irrigation hydrology model. Irrigation and Drainage Systems, 18:211-225.

Ayars, J.E.  2004.  Improving Water Management in Irrigated Agriculture.  Water Rights and Related Water Supply Issues. Proceedings 2004 Water Management Conference, Ed. R.R Murray, K. Jacobson, S.S. Anderson, U.S. Committee on Irrigation and Drainage. Denver, CO.    Pgs. 375-384.

Christen, E.W. J.W. Hornbuckle, and J.E. Ayars. 2004. A methodology to assess the performance of subsurface drainage salinity control. 1^st National Salinity Engineering Conference, 9-12 Nov., Perth Australia. pg. 21-25

Christen, E.W. J.E. Ayars, J.W. Hornbuckle. 2004. Best management practices for minimizing salt loads from subsurface drainage systems. 1^st National Salinity Engineering Conference, 9-12 Nov. Perth, Australia. pg. 26-30.

Ayars, J.E. and R.W.O. Soppe. 2004. Integrated water management for saline drainage water disposal. 1^st  National Salinity Engineering Conference, 9-12 Nov., Perth Australia. pg. 9-14

Hornbuckle, J.W., E.W. Christen, R.D. Faulkner, and J.E. Ayars. 2004. Controlled drainage management to minimize salt loads. 1^st National Salinity Engineering Conference, 9-12 Nov. Perth, Australia. pg 170-175

Northey, J., E.W. Christen, J.E. Ayars, and J. Jankowski. 2005. Occurrence and measurement of salinity stratification in the shallow groundwater in the Murrumbidgee Irrigation Area, south-eastern Australia. Ag. Water Management 81:23-40.

Kelleners, T.J., D.A. Robinson, P.J. Shouse, J.E. Ayars, and T.H. Skaggs.  2005.  Frequency Dependence of the Complex Permittivity and Its Impact on Dielectric Sensor Calibration in Soils.  Soil Sci. Soc, Am. J. 69:67-76.

Corwin, D.L., S.M. Lesch, P.J. Shouse, R. Soppe, and J.E. Ayars. 2005. Delineating site- specific management units using geospatial EC_a measurements. Chapt 10. Handbook of Agricultural Geophysics, eds B. Allred, J. Daniles, and R. Ehsani, CRC Press.

Ayars, J.E.,  E.W. Christen, R.W. O. Soppe, J.W. Hornbuckle, and R.A. Schoneman. 2005. In-situ crop water use from shallow ground water to reduce drainage and save irrigation water. International salinity forum, Managing Saline Soils and Water: Science, Technology, and Social Issues, Oral presentation abstracts, April 25-27, 2005 Salinity Forum.  Riverside Convention Center, Riverside, Pg.25-28.

Ayars, J.E. and R.A. Schoneman. 2005. Irrigating field crops in the presence of saline ground water. ICID meeting Beijing. Water Quality Symposium.

Williams, L.E. and J.E. Ayars. 2005. Water use of Thompson Seedless grapevines as affected by the application of gibberellic acid (GA₃) and trunk girdling - practices to increase berry size. Agriculture and Forest Meteorology 129:85-94.

Johnson, R.S., L.E. Williams, J.E. Ayars, and T.J. Trout. 2005. Weighing lysimeters for studying tree and vine water relations. California Agriculture 59(2):133-136.

Williams, L.E. and J.E. Ayars. 2005. Grapevine water use and crop coefficient are linear functions of the shaded area measured beneath the canopy.  Agricultural and Forest Meteorology, 132:201-211.

Hornbuckle, J.W., Christen, E.W., Ayars, J.E. and Faulkner, R. 2005. Controlled watertable management strategy for reducing salt loads from subsurface drainage under perennial agriculture in semi-arid Australia. Irrigation and Drainage Systems. 19:145-159.

Vaughan, P.J., P.J. Shouse, D.L. Suarez, M. Th. van Genuchten, and J.E. Ayars. 2005. Analysis of field-scale salinization: A comparison of different modeling approaches. J. Hydrol. Hydromech. 53:73-90.

Ayars, J.E. and R.A. Schoneman. 2006. Irrigating field crops in the presence of saline groundwater. Irrigation and Drainage 55(3):265-279.

Ayars, J.E., E.W. Christen, and J. W. Hornbuckle. 2006. Controlled drainage for improved water management in arid irrigated agriculture.  Ag. Water Management.  86(1-2)128-139.

Ayars, J.E., E.W. Christen, R.W. Soppe, and W. Meyer. 2006. Resource potential of shallow ground for crop water use - A review. Irrigation Science. 24(3):147-160

Vaughan, P.J. T.J. Trout, and J.E. Ayars. 2007. A processing method for weighing lysimeter data and comparison to micrometeorological Eto predictions. 88(1-3):141-146.

Ayars, J.E. 2007. Water requirements of irrigated garlic. Paper Number 072285, ASABE International Meeting, Minneapolis, Minn. June 17-20, 2007.  Pg. 11.

Ayars, J.E. and P. Shouse. 2007. In-situ use of ground water by alfalfa. Paper Number 072186, ASABE International Meeting, Minneapolis, Minn. June 17-20, 2007. Pg. 11.

Lamm, F.R., J.E. Ayars, and F.S. Nakayama. 2007. Eds. Microirrigation for crop production. Developments in Agricultural Engineering 13. Elsevier, 618. pp.

Ayars, J.E. and C.J. Phene. 2007. Automation. Chapt 7. In Microirrigation for Crop Production. Eds. F.R. Lamm, J.E. Ayars, F. Nakayama. Elsevier, pg 259- 284.

Ayars, J. E.,  D.A. Bucks, F.R. Lamm and F.S. Nakayama. 2007. Introduction, Chapt 1. In Microirrigation for Crop Production. Eds. F.R. Lamm, J.E. Ayars, F. Nakayama. Elsevier, pg.1-26.

Ayars, J. E. 2007. Adapting irrigated agriculture to saline environments. CAB publishers. (in press)

Madramootoo, C.A., W.R. Johnston, J.E. Ayars, R.O. Evans, and N.R. Fausey. 2007. Agricultural drainage management quality and disposal issues in North America. Irrigation and Drainage. (in press)

Ayars, J.E., R.W. Soppe, and P. Shouse. 2007. Alfalfa production using saline drainage water. Proceedings of USCID Fourth International Conference on Irrigation and Drainage: The role of irrigation and drainage in a sustainable future. Oct. 3-6, Sacramento, CA ( in press)

Fouss, J., R.E. Evans, and J.E. Ayars. (2007)  Watertable control systems. Chapter 16 in Design and Operation of Farm Irrigation Systems Ed. G.J. Hoffman, R.E. Evans. (in press)

Lord, J.M. and J.E. Ayars. Evaluating Performance of Farm Irrigation System. (2007) Chapter 20, ASAE Monograph, Design and Operation of Farm Irrigation System. Eds. G. J. Hoffman, R.E. Evans. (in press)

Ayars, J.E. 2007. Water Resources in Jordan: Evolving policies for development, the environment, and conflict resolution. A review for Ag. Water Management. (submitted)

Shouse, P.J. and J.E. Ayars. 2007. Modeling alfalfa water use from shallow ground water. Vadose Zone Journal. In preparation.

Ayars, J. E. and B.R. Hanson. 2008. Irrigation strategies and water table control. Chapter in UC book. In preparation.

Ayars, J.E. 2008. On-farm irrigation and drainage practices. Chapter 16, ASCE Manual 71 Ed. K.K. Tanji. In review.