Dan Sullivan

Soil Science

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Content by Dan Sullivan

Soil Organic Matter as a Soil Health Indicator: Sampling, Testing and Interpretation

Testing for soil organic matter helps you monitor soil health over time. Good soil management practices can improve soil organic matter in three to five years.

By Dan Sullivan, Amber Moore, Linda Brewer | OSU Extension Catalog

OSU Organic Fertilizer & Cover Crop Calculator: Predicting Plant-available Nitrogen

Describes the OSU Organic Fertilizer & Cover Crop Calculator and using it to predict plant-available nitrogen.

By Clare Sullivan, Dan Sullivan, Linda Brewer, Nick Andrews | OSU Extension Catalog

Nutrient Management for Pastures: Western Oregon and Western Washington

Describes nutrient management practices for pastures to produce forage as a main feed source for western Oregon and Washington livestock.

By Dan Sullivan, Gene Pirelli, Amber Moore, Shelby Filley, Melissa Fery | OSU Extension Catalog

Soil Nitrate Testing for Willamette Valley Vegetable Production

A soil nitrate test measures the concentration of nitrate in the soil at a specific moment in time, including nitrate originating from organic inputs, fertilizer, and soil organic matter. This publication describes how to use in-season soil nitrate testing to adjust sidedress N fertilizer...

By Dan Sullivan, Ed Peachey, Aaron Heinrich, Linda Brewer, Nick Andrews | OSU Extension Catalog

Biosolids in Dryland Cropping Systems

This publication reviews the long-term benefits of municipal biosolids applications on soil health in dryland cereal and pasture cropping systems east of the Cascades. Biosolids were an especially effective source of organic matter for soil restoration. Increased soil nutrient status was also...

By Dan Sullivan, Linda Brewer | OSU Extension Catalog

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