Small and Organic Farm Advisor
University of California
Small and Organic Farm Advisor

Nutrient Management

How do I match tomato nutrient demand and nitrogen release from organic amendments?

Nitrogen dynamics in field-grown organic heirloom tomatoes Learn about tomato demand and nitrogen release rates from organic amendments to improve your crop productivity and nitrogen reporting

How can I estimate nitrogen availability in my organic production?

Estimating Nitrogen Availability in Organic Crop Production: For N budgeting and other purposes (PDF) - This worksheet intends to serve as a guide to improve prediction and synchronization of plant available N on organic farms.

WORKSHEET for Estimating Nitrogen Availability in Organic Crop Production: For N budgeting and other purposes (PDF)

How do I interpret fertilizer recommendations and calculate how much fertilizer to apply to raised beds, mulched systems?

Calculating fertilizer rates for vegetables grown in raised-bed, mulched, cultural systems (PDF) - Document explaining how to interpret fertilizer recommendations and calculate the amount of fertilizer you should apply to your raised beds. 
Nutrient mmt

How can soil carbon and microbial biomass improve plant-soil-nitrogen cycling and plant nutrition?

Soil Biology and Nutrient Cycling on Yolo County Organic Farms (PDF)- Presentation by Louise Jackson about soil biology and nutrient cycling as well as the role of mycorrhizal fungi and microbial biomass in nutrient cycling
Nutrient Cycling

Where can I buy compost and how much do I need for my farm? How much will it cost?

The Compost Buyers Guide gives information about where you can purchase compost, as well as pricing and product details. Use this guide on How to Add Compost on Your Small Farm to learn how much compost you may need. 

Where can I send plant tissue samples for nutrient analysis?

Laboratories Providing Plant Tissue Testing (PDF) - A list of labs in South-Central, North-Central, and Northern California that do plant tissue sample analysis.

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