Geisseler Lab

Nutrient Management

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Contact:

UC Davis
1 Shields Ave.
2146 Plant and Envirnmental Sciences Building
Davis, CA, 95616

djgeisseler@ucdavis.edu

See location on campus map

Our Lab

Our lab focusses on nutirent management in California cropping systems. Our main focus is on nitrogen, but we also do research and outreach on phosphorus, potassium and other nutrients.

The Team

The nutrient management team is led by Daniel Geisseler, a University of California Cooperative Extension Specialist in nutrient management. A small but dedicated team of graduate students, junior specialists and student assistants contribute to the success of the lab. Click here to find out more about them.

Contact us

UC Davis
1 Shields Ave.
2146 Plant and Envirnmental Sciences Building
Davis, CA, 95616

See location on campus map

Publications

Find a list of our publications in peer-reviewed scientific journals.

Research and outreach projects

California Fertilization Guidelines

The guidelines are based on research results from studies carried out in California and elsewhere. The guidelines include information on nitrogen, phosphorus and potassim managment for more than 30 major crops.

Interactive Online Tools

Based on our research we developed different online tools that allow estimating nitrogen availability and crop fertilizer requirements based on site-specific conditions entered by the user.

Nitrogen Mineralization Study - Phase 1

The objective of this project is to develop a tool that allows determining nitrogen mineralization rates during the cropping season. During the first phase we focused on soil properties and soil temperature.

Nitrogen Mineralization Study - Phase 2

The objective of this project is to improve predictions of nitrogen mineralization rates during the cropping season. During the second phase we now focus on cropping history, crop residue management and soil moisture.

Soil Health Project

A useful soil health indicator should respond to management, not be too influenced by other factors, and be related to plant growth. In this project we assess several soil health indicators for their responsiveness, variability, and association with plant performance.

Nitrogen Concentrations in Harvested Plant Parts

The objective of this project is to generate a robust dataset of nitrogen concentrations in harvested plant parts and perennial tissue of crops grown in California. The data is used in the irrigated Lands Regulatory Program to calculate nitrogen removed based on yield.

Nitrogen Availability in Organic Fresh Market Tomato Production

In this 2-year project we use a replicated field trial, plots on grower fields, and lab incubations to better understand nitrogen dynamics in organic heirloom tomato fields. Our goal is to help growers improve nitrogen use efficiency by tailoring the types and rates of organic amendments to plant uptake.

Can grafting of drip irrigated organic fresh market tomatoes improve access to soil nitrogen?

In this project, we are determining whether grafting fresh market tomato scions on different rootstocks improves the plants' ability to explore the soil's nitrogen pool under different irrigation practices.

Development of a Tool for Nitrogen and Irrigation Management for Processing Tomatoes

Computer based decision support tools are becoming a central component of farm management. The main objective of this project is to develop a web-based decision support tool for improved N and irrigation management of processing tomatoes.

Irrigation and Nitrogen Management of Onions in the Low Desert

In field trials at the University of California Desert Research and Extension Center in Holtville, CA, we investigated the effects of irrigation and nitrogen rates on onion production. The trials were conducted over three growing seasons. Measurements included yield, onion size distribution, onion quality and leaf temperature.

Nitrogen Availability in Organic Vegetable Systems

We are determining the nitrogen availability from different organic sources in field trials and laboratory experiments. The results shall be incorporated into decision support tools for organic growers.

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