Completed Projects
The following is a list of completed FREP projects; each title links to a PDF of the project's final report. Summaries of many of these projects are available in the FREP Research Database as well as previous FREP Conference Proceedings. These findings have not been subjected to independent scientific peer review. Some Project Leaders have published their results in academic journals. Reprints of the journal publications may be requested directly from the corresponding authors.
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Fertigation Education for the San Joaquin Valley (12-0390-SA)
William Green and Kaomine Vang
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Remediation of Tile Drain Water Using Bioreactors (11-0462-SA)
T.K. Hartz, Richard Smith, Mike Cahn, and Laura Tourte -
California Certified Crop Advisor FREP Educational/Outreach Project (11-0470-SA)
Dan Putnam - Richard Smith, Mike Cahn, and T.K. Hartz
- David M. Crohn and Marsha Campbell Mathews
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Management Tools for the Fertilization of the 'Hass' Avocado (11-0437-SA)
Richard Rosecrance and Carol J. Lovatt
- G. Stuart Pettygrove
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Development of a Nutrient Budget Approach to Fertilizer Management in Almond (10-0039-SA)
Patrick Brown -
Nitrogen Research & Groundwater Management Education Program (10-0011-SA)
Renee Pinel - Michael Delwiche
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Chemistry, Fertilizer, and the Environment – A Comprehensive Unit (10-0010-SA)
Judy Culbertson, Shaney Emerson, and Lyn Hyatt -
Development of Leaf Sampling and Interpretation Methods for Almond and Pistachio (10-0015-SA)
Patrick Brown - Kitren Glozer and Chuck Ingels
- Carol J. Lovatt and Ben Faber
- W.R. Horwath and S.J. Parikh
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Improving Pomegranate Fertigation and Nitrogen Use Efficiency with Drip Irrigation Systems (09-0583)
James E. Ayars and Claude J. Phene - Carol J. Lovatt
- T.K. Hartz
- Richard Smith and Michael Cahn
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Western Fertilizer Handbook Turf & Ornamental Edition (08-0007)
Renee Pinel and Pamela Emery
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California Certified Crop Adviser FREP Educational Project (07-0352)
Dan Putnam - Carol J. Lovatt, Richard Rosecrance, and Ben Faber
- R. Scott Johnson
- Renee Pinel, et al.
- Stuart Pettygrove
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Evaluation of Humic Substances Used in Commercial Fertilizer Formulations (07-0174)
T.K. Hartz - Kay Mercer and Kevin Peterson
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New Standard for the Effectiveness of Foliar Fertilizers (07-0667)
Carol J. Lovatt -
Optimizing Nitrogen Availability in Cherry Growth to Obtain High Yield and Fruit Quality (07-0666)
Kitren Glozer, Gregory Lang, and Joe Grant
- Patrick Brown
- Tim Hartz
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Site-Specific Fertilizer Application in Orchards, Nurseries and Landscapes (06-0600)
Michael Delwiche, et al. - Patrick Brown, et al.
- T.K. Hartz, Richard Smith, and Mike Cahn
- Chris van Kessel and Bruce Linquist
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Fertilization Technologies for Conservation Tillage Production Systems in California (04-0808)
Jeff Mitchell, et al. - Stuart Pettygrove
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Hiring a Landscape Company - What You Should Know Before You Start (03-0654)
Valerie J. Mellano -
Improving the Procedure for Nutrient Sampling in Stone Fruit Trees (03-0652)
R. Scott Johnson - Carol J. Lovatt
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Potassium Fertility Management for Optimum Tomato Yield and Fruit Color (03-0651)
Tim Hartz - Michael Delwiche, et al.
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Reevaluating Tissue Analysis as a Management Tool for Lettuce and Cauliflower (03-0650)
T.K. Hartz -
Soil-Solution Partitioning of Trace Elements in Cropland Soils of California (03-0088)
Andrew C. Chang, Weiping Chang, and Albert L. Page
- Richard Y. Evans and Linda L. Dodg
- Michael Cahn, Husein Ajwa, and Richard Smith
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Practical Soil Test Methods for Predicting Net N Mineralization (02-0653)
W.R. Horwath and G.S. Pettygrove -
The Effect of Nutrient Deficiencies on Stone Fruit Production and Quality (02-0691)
R. Scott Johnson
- Michael Bradley, Joe Brengle, and Teresa Winovitch
- Blaine Hanson and Jan W. Hopmans
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Development of a Leaf Color Chart for California Rice Varieties (01-0510)
Randall G. Mutters - Robert Green, et al
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Development of Lime Recommendations for California Soils (01-0511)
Robert O. Miller, Janice Kotuby-Amacher, and Nat Dellavalle - William R. Horwath, et al.
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Efficient Phosphorus Management in Coastal Vegetable Production (01-0509)
T.K. Hartz - Thomas Harter, et al.
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Fertilization Technologies for Conservation Tillage Production Systems in California (01-0123)
Jeff Mitchell and Willi Horwath -
Site-Specific Variable Rate Fertilizer Nitrogen Application in Cotton (01-0507)
Richard E. Plant, et al.
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Ammonia Emission Related to Nitrogen Fertilizer Application Practices (00-0515)
Charles F. Krauter -
Can We Predict K Fixation in the San Joaquin Valley from the Soil Texture and Mineralogy?
M. Murashkina, et al. -
Effect of Different Rates of N and K on Drip-Irrigated Beauregard Sweetpotatoes (00-0507)
Scott Stoddard and Bob Weimer - Richard Smith and Tim Hartz
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From the Ground Up: A Step-By-Step Guide to School Gardening (00-0072)
Jennifer Lombardi - Roland D. Meyer, Daniel B.Marcum, and Steve Orloff
- G. Stuart Pettygrove and Randal J. Southard
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Long Term Rice Straw Incorporation: Does It Impact Maximum Yield? (00-0651)
Chris van Kessel and William R. Horwath - Donald J. Merhaut and Richard Y. Evans
- Kelly Huff
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Precision Horticulture: Technology Development and Research and Management Applications (00-0497)
Patrick H. Brown - Ronald E. Voss
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Residual Soil Nitrogen and Nitrogen Management for Alcala Cotton (00-0604)
R.B. Hutmacher, et al. - Richard Rosecrance and Carol J. Lovatt
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Site-Specific Variable Rate Fertilizer Application in Rice and Sugar Beets (00-0505)
Richard E. Plant, et al. -
Teach the Teachers: Garden-Based Education about Fertility and Fertilizers (00-0070)
Peggy Sears Perry
- Marc Buchanan
- Molly Johnson and Gwen Huff
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Pajaro Valley Nutrient Management Education & Outreach Project (99-0764)
U Win and Frank Shields - Andrew C. Chang
- Jack King, Jr.
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Demonstration of Presidedress Soil Nitrate Testing as an N Management Tool (98-0513)
Tim Hartz - Richard Rosecrance, P. A. Delwiche, and Fred Thomas
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Efficient Irrigation for Reduced Non-Point Source Pollution from Low Desert Vegetables (98-0423)
Charles. A. Sanchez, Dawit Zerihun, and Khaled. M. Bali
- Laosheng Wu and John Kabashima
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Agriculture and Fertilizer Education for Grades K-12 (97-0361)
Pamela Emery, Richard Engel, and Judy Culbertson - Jose L. Aguiar, et al.
- Ken Giles
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Development of an Educational Handbook on Fertigation for Grape Growers (97-0365 M99-07)
Glenn McGourty -
Development of Fertilization and Irrigation Practices for Commercial Nurseries (97-0365 II M99-03)
Richard Y. Evans, Carmen Garcia-Navarro, and Linda L. Dodge - Robert L. Green, Grant J. Klein, and Victor A. Gibeault Thomas
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Development of Nitrogen Best Management Practices for the "Hass" Avocado (97-0365 M98-01)
Carol J. Lovatt - Drip Irrigation and Fertigation Scheduling for Celery Production (97-0365 M97-02) T.K. Hartz
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Nitrogen Mineralization Rate of Biosolids and Biosolids Compost (97-0365 M99-10)
Tim Hartz - Larry D. Godfrey and Robert Hutmacher
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Long-Term Nitrate Leaching Below the Root Zone in California Tree Fruit Orchards (97-0365 M97-04)
Thomas Harter, et al. - Nitrogen Budget in California Cotton Cropping Systems (97-0365 M97-09) William Rains, Robert L. Travis, and Robert Hutmacher
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Nitrogen Fertilization and Grain Protein Content in California Wheat (97-0365 M99-04)
L.F. Jackson -
Potassium Responses in Rice Fields as Affected By Straw Management Practices (97-0365 M99-08)
Chris van Kessel, et al. -
Relationship between Fertilization and Pistachio Diseases (97-0365 M99-06)
Themis J. Michailides and Patrick Brown - Soil Testing to Optimize Nitrogen Management for Processing Tomatoes (97-0365 M97-03) Don May and Jeff Mitchell
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Uniformity of Chemigation in Micro-irrigated Permanent Crops (97-0365 M97-008)
Larry Schwankl and Terry Pritchard - Marita Cantwell, et al.
- Gene Miyao, Paul Robins, and Mike Cahn
- Patrick H. Brown
- Larry E. Williams
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Improving Fertilizer Practices of SE Asians in Fresno and Tulare Counties (96-0405)
Richard Molinar and Manuel Jimenez - D. Putnam
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Nitrogen Management in Citrus under Low Volume Irrigation (96-0280)
M.L. Arpaia and L.J. Lund -
Survey of Changes in Irrigation Methods and Fertilizer Management Practices in California (96-0371)
John Letey, Jr.
- Carol J. Lovatt
- Larry Klaas and Thomas Doerge
- Michelle Le Strange, Jeffrey P. Mitchell, and Louise E. Jackson
- Richard Smith and Kurt Schulbach
- C.A. Sanchez
- Jeff Mitchell, Laosheng Wu, and Blake Sanden
- Warren E. Bendixen
- T.K. Hartz, Warren Bendixen, and Kurt Schulbach
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Guide to Nitrogen Quick-Tests for Vegetables with the 'Cardy' Nitrate Meter (95-0582)
Kurt Schulbach, et al. -
Irrigation and Nutrient Management Conference and Trade Fair (95-0419)
Danyal Kasapligil -
Relationship between Fertilization and Bacterial Canker Disease in French Prune (95-0478)
Steven Southwick, Bruce Kirkpatrick, and Becky Westerdah - Stuart Pettygrove, et al.
- R. Scott Johnson and Richard Rosecrance
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Best Management Practices for Tree Fruit and Nut Production: A Video (94-0463)
Thomas Doerge and Larry Klaas - Patrick Cavanaugh
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Effects of Four Levels of Applied Nitrogen on Three Fungal Diseases of Almond Trees (94-0513)
Beth L. Teviotdale -
Effects of Various Phosphorus Placements on No-Till Barley Production (94-0450)
Michael J. Smith - Stuart Pettygrove
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Nitrogen Management through Intensive on-Farm Monitoring (94-0362)
T.K. Hartz -
Nutrient Recommendation Training in Urban Markets: A Video (94-0463)
Wendy Jenks and Larry Klaas
- Carol J. Lovatt and Joseph G. Morse
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Drip Irrigation and Nitrogen Fertigation Management for California Vegetable Growers: Videotape
Timothy K. Hartz - Ronald Voss
- Robert J. Zasoski
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Western States Agricultural Laboratory Proficiency Testing Program (93-0568)
R.O. Miller and J. Kotuby-Amacher
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Crop Management for Efficient Potassium Use and Optimum Winegrape Quality (92-0627)
Mark A. Matthews - Shrini K. Updahyaya, Sayedahmed Shafii, and William J. Chancellor
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Establishing Updated Guidelines for Cotton Nutrition (92-0589)
Bill Weir, et al. -
Impact of Microbial Processes on Crop Use of Fertilizers from Organic and Mineral Sources (92-0639)
Kate M. Scow -
Optimizing Drip Irrigation Management for Improved Water and Nitrogen Use Efficiency (92-0629)
Timothy K. Hartz -
Potential Nitrate Movement below the Root Zone in Drip-Irrigated Almonds (92-0631)
Roland D. Meyer - Mark Van Horn
- Stuart Pettygrove, et al.
- Donald W. Grimes
- R. Scott Johnson and Claude J. Phene
- Bonnie Fernandez
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