Research & Project Database
Fertilizer Research And Education Program
Research and Project Database
Since 1990, FREP has funded research on many of California’s important and environmentally sensitive cropping systems. This database aims to make the wealth of information contained in FREP research projects available, understandable, and convenient for growers to implement. See the Crop Fertilization Guidelines for tips on how to improve nutrient management, based on information gleaned from research.
Current Projects
The following is a list of FREP projects that are currently being conducted. Each title links to the project's approved proposal and scope of work. Summaries of many of these projects are featured in previous FREP Conference Proceedings.
Copies of interim and annual project reports are available by contacting FREP at (916) 900-5022 or FREP@cdfa.ca.gov.
Current Projects- 2022 FREP-funded projects
- Developing Tools and Information on Irrigation and Nitrogen Best Management Practices in California’s Low Desert Lettuce Production Systems (22-1312) Ali Montazar
- The Role of Irrigation Management for Improving Nitrogen Use Efficiency for Broccoli Grown with Nitrate-Contaminated Irrigation Water (22-1454) Charlotte Decock
- Development of Precision Yield Monitor for Almond and Pistachio (22-1455)
- 2021 FREP-funded projects
- Targeted Nitrogen and Irrigation Education in California’s Nitrate Impacted Regions (21-0502)
Doug Parker - Nutrient Management and Irrigation Efficiency Outreach and Education for Latino and Southeast Asian Farmers (21-0573)
Carmen Carrasco - Nitrogen Fertilizer and Irrigation Best Management Practices for the Low Desert Sudangrass Production Systems (21-0586)
Oli Bachie - Optimizing Nitrogen Fertilizer Concentrations in Vegetable Transplant Production (21-0587)
Lorence Oki - Quantify and Model Overlooked Pathways of Nitrogen Loss From Organic Inputs Across Contrasting Soil Types (21-0588)
Timothy Bowles - Distributed Water and Fertilizer Delivery for Minimizing
Nitrogen Losses by Leaching and Volatilization (21-0594)
Teamrat A. Ghezzehei
- 2020 FREP-funded projects
- Assessment of Nitrogen Content of the Harvested Portion of Specialty Crops to Estimate Crop Nitrogen Removal and Improve Nitrogen Management in Crops (20-0250)
Richard Smith and Michael Cahn - “Crop Nutrient Minute” Video Series (20-0877)
Parry Klassen - Ventura County Nitrogen Management Training Program (20-0878)
Jodi Switzer - Assessment of Harvested and Sequestered Nitrogen Content to Improve Nitrogen Management in Crops, Phase 2 (20-0879)
Charlotte Gallock - Development of site-specific nitrogen fertilization recommendations for annual crops (20-0880)
Daniel Geisseler - Enhancing Nitrogen and Water Use Efficiency in California Carrot Production Through Management Tools and Practices (20-0960)
Aliasghar Montazar - Certification and Distance Learning for Fertigation (20-0961)
Charles M. Burt - Outreach and revenue generation for sustaining CropManage
irrigation and nutrient management decision support tool (20-0962)
Michael Cahn - University of California Nursery and Floriculture Alliance Fertilizers and Plant Nutrition Workshops for Greenhouse and Nursery Growers (20-0963)
Lorence R. Oki - Nitrogen Response of Industrial Hemp Cultivars Grown for CBD,
Essential Oils (20-0964)
Robert Hutmacher - Techniques to minimize nitrate loss from the root zone during managed aquifer recharge (20-1019)
Anthony Toby O’Geen
- 2019 FREP-funded projects
- Development of Nutrient Management Budget and Nutrient Demand Model for Nitrogen Management in Cherry
Patrick Brown, Douglas Amaral and Pedro Lima - Irrigation and Nitrogen Management, Monitoring, and Assessment to Improve Nut Production while Minimizing Nitrate Leaching to Groundwater
Thomas Harter, Patrick Brown and Isaya Kisekka - Achieving Efficient Nitrogen Fertilizer Management in California Wheat
Mark Lundy et al. - Developing a Nitrogen Mineralization Model for Organically Managed Vegetable Farms on the Central Coast
Joji Muramoto, Richard Smith and Mike Cahn - Next Generation N Management Training for Certified Crop Advisors
Doug Parker et al. - Immobilization of Nitrate in Winter-Fallow Vegetable Production Beds to Reduce Nitrate Leaching
Richard Smith, Michael Cahn, Joji Muramoto and Daniel Geisseler - Promoting the Adoption of CropManage to Optimize Nitrogen and Irrigation Use through Low-Cost Data Loggers and Cellular Modems for Spanish-Speaking Growers in Santa Cruz and Monterey Counties
Gerry Spinelli
- 2018 FREP-funded projects
-
Assessing Drip Irrigation and Nitrogen Management of Fresh Onions Produced in California Low Desert (18-0592)
Jairo Diaz, Roberto Soto, and Daniel Geisseler - Pima Cotton Nitrogen Management, Uptake, Removal - Impacts of Varieties, Subsurface Drip and Furrow Irrigation (18-0597)
Robert Hutmacher
- 2017 FREP-funded projects
-
Evaluation of Nitrogen Uptake and Applied Irrigation Water in Asian Vegetables; Bok Choy, Edible Chrysanthemums, Garlic Chives, Moringa and Lemongrass (17-0515)
Aparna Gazula -
A system Nitrogen Balance for Container Plant Production (17-0516)
Lorence Oki -
Training on Crop Management that Integrates Climate, Soil and Irrigation
System Data to Minimize Nutrient Loss and Optimize Irrigation Efficiency
(17-0469)
Trina Walley
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 andFREP Conference Proceedings. Some Project Leaders have published their results in academic journals. Reprints of the journal publications may be requested directly from the corresponding authors.
Completed Projects-
Improving nitrate and salinity management strategies for almond grown under micro-irrigation (18-0549)
Patrick Brown -
Promoting the adoption of soil nitrogen quick tests by Spanish-speaking operators on strawberry ranches in Santa Cruz and Monterey Counties (18-0535)
Gerry Spinelli -
Understanding Influences on Grower Decision–Making and Adoption of Improved Nitrogen Management Practices in the Southern San Joaquin Valley (18-0596)
Sat Darshan Khalsa and Mark Lubell - Efficient Water and Nitrogen Management Practices for Mixed Leafy Baby Green Vegetables in the Desert (18-0593) Charles A. Sanchez and Andy French
-
Assessment of Harvested and Sequestered Nitrogen Content to Improve Nitrogen Management in Perennial Crops (17-0488)
Charlotte Gallock -
A system nitrogen balance for container plant production (17-0516)
Lorence R. Oki, William Horwath and Richard Evans
- Soil biochar amendment to improve nitrogen and water management (15-0597)
Suduan Gao - Evaluation of Biochar for On-Farm Soil Management in California (16-0662)
Sanjai Parikh and Danielle Gelardi - Evaluation of certified organic fertilizers for long-term nutrient planning (16-0670)
William Horwath and Xia Zhu-Barker - University of California Nursery and Floriculture Alliance Fertilizers and Plant Nutrition Education Program (16-0678)
Lorence Oki et al - Developing a Review Process for Continuing Education Courses for Growers who Complete the Nitrogen Management Plan Training Course (16-0703)
Parry Klassen -
Expanding the California Fertilization Guidelines to Support Nutrient Management Decisions for Minor Crops (16-0610)
Daniel Geisseler -
Understanding Influences of Grower Decision-making and Adoption of
Improved Nitrogen Management Practices (16-0620)
Mark Lubell -
Citrus Early Leaf Sampling (16-0707)
Patrick Brown -
Combined New Leaf Sampling Technique for Nitrogen Analysis and Nitrogen Application Approach in Almonds (16-0708)
Patrick Brown -
Online Decision Support Tools for Irrigation and Nitrogen Management of
Central Valley Crops (16-0710)
Michael Cahn
- Evaluation of the Multiple Benefits of Nitrogen Management Practices in Walnuts (15-0360)
Parry Klassen - Prediction of summer leaf nitrogen concentration from early season samples to better manage nitrogen inputs at the right time in walnuts, prunes, and pears (15-0492)
Patrick Brown et al - Evaluation and demonstration of nitrogen management of organic vegetable production in leafy green vegetables on the Central Coast (15-0522)
Richard Smith et al -
Train the Trainer: A Nitrogen Management Training Program for Growers (15-0392)
Klassen -
Improving Nitrate and Salinity Management Strategies for Almonds Grown under Micro-Irrigation (15-0523)
Patrick Brown -
New Fertigation Book (15-0393)
Charles Burt -
Developing a decision support tool for processing tomato irrigation and fertilization in the Central Valley based on CropManage (15-0410)
Daniel Geisseler -
Quantifying N2O Emissions under Different On-farm Irrigation and Nutrient Management BMPs that Reduce Groundwater Nitrate Loading and Applied
Water (15-0356)
Arlene Haffa -
Prediction of Summer Leaf Nitrogen Concentration from Early Season Samples
to Better Manage Nitrogen Inputs at the Right Time in Walnuts, Prunes, and Pears (15-0492)
Patrick Brown, Emilio Laca, and Sebastian Saa -
Online Fertilization Guidelines for Agricultural Crops in California (15-0231)
Daniel Geisseler -
Nitrogen Fertilizer Loading to Groundwater in the Central Valley
(11-0301-SA and 15-0454-SA)
Thomas Harter, et al. -
Evaluation and Demonstration of Nitrogen and Phosphorous Management in Organic Leafy Green Vegetables Production on the Central Coast (15-0522)
Richard Smith, Michael Cahn, and Tim Hartz
- Development of Management Training Curriculum for Use in Grower Training for Self-Certification of Regional Water Board Nitrogen Management Plans (14-0585)
Terry Prichard and Larry Schwankl -
A Data Driven Nitrate Leaching Hazard Index and BMP Assessment Tool
(14-0452)
Toby O’Geen and Jan Hopmans -
Improving N Field Evaluation and Demonstration of Controlled Release N Fertilizers in the Western United States (14-0508)
Charles A. Sanchez and Richard Smith -
California Certified Crop Adviser FREP Educational Project (14-0555)
Daniel H. Putnam and Terry W. Stark -
Field Evaluation and Demonstration of Controlled Release N Fertilizers in the Western United States (14-0508)
Charles Sanchez -
Plant Nutrients in the Classroom (14-0481)
Judy Culbertson and Austin Miller
-
Developing Nitrogen Management Strategies to Optimize Grain Yield and
Protein Content while Minimizing Leaching Losses in California Wheat
(13-0267-SA)
Robert Hutmacher, Steve Orloff, Steve Wright, and Mark Lundy -
Nitrogen Management Training for Certified Crop Advisors (13-0241-SA)
Doug Parker, Patrick Brown, Allan Fulton, Tim Hartz, Dan Munk, Stuart Pettygrove, Lawrence Schwankle -
Phosphorus and Boron Fertilizer Impacts on Sweetpotato Production and
Long-Term Storage (13-0266-SA)
C. Scott Stoddard -
Improving N Use Efficiency of Cool Season vegetable Production Systems
with Broccoli Rotations (13-0268-SA)
Richard Smith, Michael Cahn, and T.K. Hartz
-
Measuring and Modeling Nitrous Oxide Emissions from California Cotton and Vegetable Cropping Systems (12-0452)
Dave Goorahoo -
Determining the Fertilizer Value of Ambient Nitrogen in Irrigation Water
(12-0455-SA)
Michael Cahn, Richard Smith, and T.K. Hartz -
Development of Economically Viable Variable Rate P Application Protocols for Desert Vegetable Production Systems (12-0386-SA)
Charles A. Sanchez, Pedro Andrade-Sanchez, and Kurt Nolte -
Evaluation of N Uptake and Water Use on Leafy Greens Grown in High Density Bed Plantings and Demonstration of Best Management Practices (12-0362-SA)
Richard Smith and Mike Cahn -
Characterizing N Fertilization Requirements of Crops Following Alfalfa
(12-0385-SA)
Dan Putnam and Stu Pettygrove -
Evaluation of a 24 Hour CO2 Test for Estimating Potential N-Mineralization to Reassess Fertilizer N Recommendations (12-0384-SA)
William R. Horwath, Martin Burger, and Jeffery Mitchell -
Assessment of Baseline Nitrous Oxide Emissions in Response to a Range of Nitrogen Fertilizer Application Rates in Corn Systems (12-0453-SA)
Martin Burger and William R. Horwath -
Fertigation Education for the San Joaquin Valley
(12-0390-SA)
William Green and Kaomine Vang -
Improving Pomegranate Fertigation and Nitrogen Use Efficiency with Drip Irrigation Systems (12-0387-SA)
James E. Ayars and Claude J. Phene -
Optimizing the Use of Groundwater Nitrogen for Nut Crops (12-0454-SA)
David R. Smart, Patrick Brown, Thomas Harter, and Jan Hopmans
-
How much it too much? How little is too little? / Educator's Guide to Fun with the Plant Nutrient Team (11-0454-SA)
Judy Culbertson -
Improved Methods for Nutrient Tissue Testing in Alfalfa (11-0469-SA)
Steve Orloff -
Nitrogen Fertilizer Loading to Groundwater in the Central Valley
(11-0301-SA and 15-0454-SA)
Thomas Harter, et al. -
Exploring the Potential for Using Transgenic Crops for Improved Fertilizer Use Efficiency (11-0453-SA)
Charles A. Sanchez and Roberto Gaxiola -
Determination of Root Distribution, Dynamics, Phenology and Physiology of Almonds to Optimize Fertigation Practices (11-0461-SA)
Patrick Brown -
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 -
Survey of Nitrogen Uptake and Applied Irrigation Water in Broccoli,
Cauliflower, and Cabbage Production in the Salinas Valley (11-0558-SA)
Richard Smith, Mike Cahn, and T.K. Hartz -
Optimization of Organic Fertilizer Schedules
(11-0456-SA)
David M. Crohn and Marsha Campbell Mathews -
Management Tools for the Fertilization of the 'Hass' Avocado (11-0437-SA)
Richard Rosecrance and Carol J. Lovatt -
Assessment of Plant Fertility Requirements for Agricultural Crops in California (11-0485-SA)
William R. Horwath and Daniel Geisseler
-
Irrigation and Nitrogen Management Web-Based Software for Lettuce Production (10-0013-SA)
Michael Cahn -
Relationship of Soil K Fixation and Other Soil Properties to Fertilizer K Rate Requirement (10-0012-SA)
G. Stuart Pettygrove -
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
-
Adjustable-Rate Fertigation for Site-Specific Management to Improve Fertilizer Use Efficiency
(10-0004-SA)
Michael Delwiche -
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 -
European Pear Growth and Cropping: Optimizing Fertilizer Practices Based on Seasonal Demand and Supply with Emphasis on Nitrogen Management
(10-0105-SA)
Kitren Glozer and Chuck Ingels
-
Citrus Yield and Fruit Size Can Be Sustained for Trees Irrigated with 25% or 50% less Water by Supplementing Tree Nutrition with Foliar Fertilization - Comparison of Conventional Irrigation and Partial Root Zone Drying at the Same Reduced Irrigation Rates Supplemented with Equal Foliar Fertilization (09-0581)
Carol J. Lovatt and Ben Faber -
Developing Testing Protocols to Assure the Quality of Fertilizer Materials for Organic Agriculture (09-0582)
W.R. Horwath and S.J. Parikh -
Improving Pomegranate Fertigation and Nitrogen Use Efficiency with Drip Irrigation Systems
(09-0583)
James E. Ayars and Claude J. Phene -
Towards Development of Foliar Fertilization Strategies for Pistachio to Increase Total Yield and Nut Size and Protect the Environment: A proof-of-concept project (09-0584)
Carol J. Lovatt
-
Development of a Comprehensive Nutrient Management Web site for the California Horticultural Industry (08-0629)
T.K. Hartz -
Evaluation Low-Residue Cover Crops to Reduce Nitrate Leaching, and Nitrogen and Phosphorous Losses from Winter Fallow Vegetable Production Fields in the Salinas Valley (08-0628)
Richard Smith and Michael Cahn -
Western Fertilizer Handbook Turf & Ornamental Edition
(08-0007)
Renee Pinel and Pamela Emery
-
California Certified Crop Adviser FREP Educational Project (07-0352)
Dan Putnam -
Can a Better Tool for Assessing 'Hass' Avocado Tree Nutritional Status Be Developed? A Feasibility Study (07-0002)
Carol J. Lovatt, Richard Rosecrance, and Ben Faber -
Comparing the Efficiency of Different Foliarly-Applied Zinc Formulations on Peach and Pistachio Trees by Using 68Zn Isotope (07-0669)
R. Scott Johnson -
Development and Implementation of Online, Accredited Continuing Education Classes on Proper Sampling and Application of Nitrogen/Crop Nutrients (07-0223)
Renee Pinel, et al. -
Development of Certified Crop Adviser Specialty Certification and Continuing Education in Manure Nutrient Management (07-0405)
Stuart Pettygrove -
Evaluation of Humic Substances Used in Commercial Fertilizer Formulations (07-0174)
T.K. Hartz -
Fertilizer Education Equals Clean Water (07-0120)
Kay Mercer and Kevin Peterson -
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
-
Development of a Model System for Testing Foliar Fertilizers, Adjuvants and Growth Stimulants (06-0624)
Patrick Brown -
Development of Practical Fertility Monitoring Tools for Drip-Irrigated Vegetable Production (06-0626)
Tim Hartz -
Site-Specific Fertilizer Application in Orchards, Nurseries and Landscapes (06-0600)
Michael Delwiche, et al. -
Updating Our Knowledge and Planning for Future Research, Education and Outreach Activities to Optimize the Management of Nutrition in Almond and Pistachio Production (06-0625)
Patrick Brown, et al.
-
Detecting and Correcting Soil Calcium Limitations (04-0701)
T.K. Hartz, Richard Smith, and Mike Cahn -
Fertility Management in Rice (04-0704)
Chris van Kessel and Bruce Linquist -
Fertilization Technologies for Conservation Tillage Production Systems in California (04-0808)
Jeff Mitchell, et al. -
Improving Water-Run Nitrogen Fertilizer Practices in Furrow and Border Check – Irrigated Field Crops (04-0747)
Stuart Pettygrove
-
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 -
Increasing Yield of the 'Hass' Avocado by Adding P and K to Properly Timed Soil N Applications (03-0653)
Carol J. Lovatt -
Potassium Fertility Management for Optimum Tomato Yield and Fruit Color (03-0651)
Tim Hartz -
Precision Fertigation in Orchards: Development of a Spatially Variable Microsprinkler System (03-0655)
Michael Delwiche, et al. -
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
-
Determination of Nursery Crops Yields, Nutrient Content, and Water Use for Improvement of Water and Fertilizer Use Efficiency (02-0651)
Richard Y. Evans and Linda L. Dodge -
Evaluation of Polyacrylamide (PAM) for Reducing Sediment and Nutrient Concentration in Tail Water from Central Coast Vegetable Fields (02-0781)
Michael Cahn, Husein Ajwa, and Richard Smith -
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
-
California State Fair Farm Upgrade Project (01-0640)
Michael Bradley, Joe Brengle, and Teresa Winovitch -
Crop Nitrate Availability and Nitrate Leaching under Micro-Irrigation for Different Fertigation Strategies (01-0545)
Blaine Hanson and Jan W. Hopmans -
Development of a Leaf Color Chart for California Rice Varieties (01-0510)
Randall G. Mutters -
Development of BMPs for Fertilizing Lawns to Optimize Plant Performance and Nitrogen Uptake While Reducing the Potential for Nitrate Leaching (01-0508)
Robert Green, et al. -
Development of Lime Recommendations for California Soils (01-0511)
Robert O. Miller, Janice Kotuby-Amacher, and Nat Dellavalle -
Effects of Cover Cropping and Conservation Tillage on Sediment and Nutrient Losses to Runoff in Conventional and Alternative Farming Systems (01-0473)
William R. Horwath, et al. -
Efficient Phosphorus Management in Coastal Vegetable Production (01-0509)
T.K. Hartz -
Evaluating the Impact of Nutrient Management on Groundwater Quality in the Presence of Deep Unsaturated Alluvial Sediment (01-0584)
Thomas Harter, et al. -
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.
-
Ammonia Emission Related to Nitrogen Fertilizer Application Practices (00-0515)
Charles F. Krauter -
Effect of Different Rates of N and K on Drip-Irrigated Beauregard Sweetpotatoes (00-0507)
Scott Stoddard and Bob Weimer -
Evaluation of Slow Release Fertilizers for Cool Season Vegetable Production in the Salinas Valley (00-0506)
Richard Smith and Tim Hartz -
From the Ground Up: A Step-By-Step Guide to School Gardening (00-0072)
Jennifer Lombardi -
Improving the Diagnostic Capabilities for Detecting Molybdenum Deficiency in Alfalfa and Avoiding Toxic Concentrations for Animals (00-0516)
Roland D. Meyer, Daniel B.Marcum, and Steve Orloff -
Location of Potassium-Fixing Soils in the San Joaquin Valley and a New, Practical Soil K Test Procedure (00-0508)
G. Stuart Pettygrove and Randal J. Southard -
Long Term Rice Straw Incorporation: Does It Impact Maximum Yield? (00-0651)
Chris van Kessel and William R. Horwath -
Minimizing Nitrogen Runoff and Improving Nitrogen Use Efficiency in Containerized Woody Ornamentals through Management of Nitrate and Ammonium-Nitrogen (00-0509)
Donald J. Merhaut and Richard Y. Evans -
On-Farm Monitoring and Management Practice Tracking for Central Coast Watershed Working Groups (00-0071)
Kelly Huff -
Precision Horticulture: Technology Development and Research and Management Applications (00-0497)
Patrick H. Brown -
Reducing Fertilizer Needs of Potato with New Varieties and New Clonal Strains of Existing Varieties (00-0514)
Ronald E. Voss -
Residual Soil Nitrogen and Nitrogen Management for Alcala Cotton (00-0604)
R.B. Hutmacher, et al. -
Seasonal Patterns of Nutrient Uptake and Partitioning as a Function of Crop Load of the 'Hass' Avocado (00-0621)
Richard Rosecrance and Carol J. Lovatt -
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
-
Evaluating and Demonstrating the Effectiveness of In-Field Nitrate Testing in Drip- and Sprinkler-Irrigated Vegetables (99-0756)
Marc Buchanan -
Nitrogen Budgeting Workshops (99-0757)
Molly Johnson and Gwen Huff -
Pajaro Valley Nutrient Management Education & Outreach Project (99-0764)
U Win and Frank Shields -
The Role of Inorganic Chemical Fertilizers and Soil Amendments on Trace Element Contents of Cropland Soils in California (99-0533)
Andrew C. Chang
-
Air Quality and Fertilization Practices: Establishing a Calendar of Nitrogen Fertilizer Application Timing Practices for Major Crops in the San Joaquin Valley (98-0471)
Jack King, Jr. -
Demonstration of Presidedress Soil Nitrate Testing as an N Management Tool (98-0513)
Tim Hartz -
Effect of Cover Crop or Compost on Potassium Deficiency and Uptake, and on Yield and Quality in French Prunes (98-0422)
Richard Rosecrance, P. A. Delwiche, and Fred Thomas -
Efficient Irrigation for Reduced Non-Point Source Pollution from Low Desert Vegetables (98-0423)
Charles. A. Sanchez, Dawit Zerihun, and Khaled. M. Bali
-
Agricultural Baseline Monitoring and BMP Implementation: Steps Towards Meeting TMDL Compliance Deadlines within the Newport Bay/San Diego Creek Watershed (97-0365 M99-01)
Laosheng Wu and John Kabashima -
Agriculture and Fertilizer Education for Grades K-12 (97-0361)
Pamela Emery, Richard Engel, and Judy Culbertson -
Development and Demonstration of Nitrogen Best Management Practices for Sweet Corn in the Low Desert (97-0365 M98-02)
Jose L. Aguiar, et al. -
Development and Testing of Application Systems for Precision Variable Rate Fertilization (97-0365 M97-06A)
Ken Giles -
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 -
Development of Irrigation and Nitrogen-Fertilization Programs on Tall Fescue to Facilitate Irrigation-Water Savings and Fertilizer-Use Efficiency (97-0365 M97-07)
Robert L. Green, Grant J. Klein, and Victor A. Gibeault -
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 -
Nitrogen Mineralization Rate of Biosolids and Biosolids Compost (97-0365 M99-10)
T.K. Hartz -
Interaction of Cotton Nitrogen Fertility Practices and Cotton Aphid Population Dynamics in California Cotton (97-0365 M98-04)
Larry D. Godfrey and Robert Hutmacher -
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 -
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 -
Uniformity of Chemigation in Micro-irrigated Permanent Crops (97-0365 M97-008)
Larry Schwankl and Terry Pritchard -
Water and Fertilizer Management for Garlic: Productivity, Nutrient and Water Use Efficiency and Postharvest Quality (97-0207)
Marita Cantwell, et al. -
Winter Cover Crops Before Late-Season Processing Tomatoes for Soil Quality and Production Benefits (97-0365 M99-11)
Gene Miyao, Paul Robins, and Mike Cahn
-
Development of a Nitrogen Fertilizer Recommendation Model to Improve N-Use Efficiency and Alleviate Nitrate Pollution to Groundwater from Almond Orchards (96-0367)
Patrick H. Brown -
Fertilizer Use Efficiency and Influence of Rootstocks on Uptake and Nutrient Accumulation in Winegrapes (96-0399)
Larry E. Williams -
Improving Fertilizer Practices of SE Asians in Fresno and Tulare Counties (96-0405)
Richard Molinar and Manuel Jimenez -
Management of Nitrogen Fertilization in Sudangrass for Optimum Production, Forage Quality and Environmental Protection (96-0400)
D. Putnam -
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.
-
Avocado Growers Can Reduce Soil Nitrate Groundwater Pollution and Increase Yield and Profit (95-0523)
Carol J. Lovatt -
Best Management Practices (BMPs) for Nitrogen and Water Use in Irrigated Agriculture: A Video (95-0463)
Larry Klaas and Thomas Doerge -
Determination of Best Nitrogen Management Practices for Broccoli Production in the San Joaquin Valley (95-0520)
Michelle Le Strange, Jeffrey P. Mitchell, and Louise E. Jackson -
Development and Promotion of Nitrogen Quick Tests for Determining Nitrogen Fertilizer Needs of Vegetables (95-0582)
Richard Smith and Kurt Schulbach -
Diagnostic Tools for Efficient Nitrogen Management of Vegetables Produced in the Low Desert (95-0222)
C.A. Sanchez -
Effects of Irrigation Nonuniformity on Nitrogen and Water Use Efficiencies in Shallow-Rooted Vegetable Cropping Systems (95-0519)
Jeff Mitchell, Laosheng Wu, and Blake Sanden -
Evaluation of Controlled Release Fertilizers and Fertigation in Strawberries and Vegetables (95-0418)
Warren E. Bendixen -
Evaluation of Pre-Sidedress Soil Nitrate Testing to Determine N Requirements of Cool Season Vegetables (95-0583)
T.K. Hartz, Warren Bendixen, and Kurt Schulbach -
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 -
Site Specific Farming Information Systems in a Tomato-Based Rotation in the Sacramento Valley (95-0518)
Stuart Pettygrove, et al. -
Using High Rates of Foliar Urea to Replace Soil Applied Fertilizer in Early Maturing Peaches (95-0214)
R. Scott Johnson and Richard Rosecrance
-
Best Management Practices for Tree Fruit and Nut Production: A Video (94-0463)
Thomas Doerge and Larry Klaas -
Education through Radio (94-0517)
Patrick Cavanaugh -
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 -
Improvement of Nitrogen Management in Vegetable Cropping Systems in the Salinas Valley and Adjacent Areas
Stuart Pettygrove -
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
-
Citrus Growers Can Reduce Nitrate Groundwater Pollution and Increase Profits by Using Foliar Urea Fertilization (93-0530)
Carol J. Lovatt and Joseph G. Morse -
Drip Irrigation and Nitrogen Fertigation Management for California Vegetable Growers: Videotape
Timothy K. Hartz -
Educating California's Small and Ethnic Minority Farmers: Ways to Improve Fertilizer Use Efficiency through the Use of Best Management Practices (BMPs)
Ronald Voss -
Nitrogen Efficiency in Drip-Irrigated Almonds (93-0551)
Robert J. Zasoski -
Western States Agricultural Laboratory Proficiency Testing Program (93-0568)
R.O. Miller and J. Kotuby-Amacher
-
Crop Management for Efficient Potassium Use and Optimum Winegrape Quality (92-0627)
Mark A. Matthews -
Determination of Soil Nitrogen Content In-Situ (92-0575)
Shrini K. Updahyaya, Sayedahmed Shafii, and William J. Chancellor -
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 -
The Use of Composts to Increase Nutrient Utilization Efficiency in Agricultural Systems and Reduce Pollution from Agricultural Activities (92-0628)
Mark Van Horn
-
Demonstration Program for Reducing Nitrate Leaching through Improvements to Irrigation Efficiency and Fertilizer/Cover Crop Management (91-0654)
Stuart Pettygrove, et al. -
Field Evaluation of Water and Nitrate Flux through the Root Zone in a Drip/Trickle-Irrigated Vineyard (91-0556)
Donald W. Grimes -
Influence of Irrigation Management on Nitrogen Use Efficiency, Nitrate Movement, and Groundwater Quality in a Peach Orchard (91-0646)
R. Scott Johnson and Claude J. Phene -
Nitrogen Management for Improved Wheat Yields, Grain Protein and the Reduction of Excess Nitrogen (91-0485)
Bonnie Fernandez
About Frep
Grant Program
Training
California Crop Fertilization Guidelines
Research & Project Database
