Vegetable Research & Information Center, UC Cooperative Extension

UC Organic Soil Fertility Management Symposium

January 15, 2009
Activities & Recreation Center, UC Davis



8:00-8:30 AM Registration
8:30-8:40 Welcome and introduction

Soil fertility in organic systems: lessons from long-term studies
Will Horwath, Dept. of Land, Air & Water Resources, UC Davis

Cover crop contributions to N fertility
Richard Smith, UCCE Monterey-San Benito-Santa Cruz Counties

Managing P and K fertility in organic systems
Rob Mikkelsen, International Plant Nutrition Institute, Merced, CA
10:15-10:30 Break

Certification issues in organic soil fertility management
Chip Sundstrom, FJS Consulting, Davis, CA

Compost use: opportunities and limitations
Jean VanderGheynst, Biological and Agricultural Engineering, and
Tim Hartz, Dept. of Plant Sciences, UC Davis


Organic management effects on the soil microbial community and nutrient cycling
Louise Jackson, Dept. of Land, Air & Water Resources, UC Davis
12:10-1:00 PM Lunch

Soil and plant testing for organics–what works and what doesn’t
Tim Hartz, Dept. of Plant Sciences, UC Davis


In-season fertilization in organic systems
Mark Gaskell, UCCE Santa Barbara-San Luis Obispo Counties

Maintaining microbial food safety in organic systems
Trevor Suslow, Dept. of Plant Sciences, UC Davis
2:30-2:45 Break

Irrigation management effects on organic soil fertility and environmental impact
Mike Cahn, UCCE Monterey-San Benito-Santa Cruz Counties


Economics of organic soil fertility management
Karen Klonsky, Dept. of Agricultural & Resource Economics, UC Davis

3:40-4:00 Discussion
4:00 PM



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