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Showing 1 - 10 of 16 results.

Post-Harvest Soil Nitrate Testing for Manured Cropping Systems West of the Cascades

Describes the use of postharvest soil nitrate testing as a tool for assessing nitrogen management in manured cropping systems west of the Cascades. The first section gives general information on the test and is designed for use...

Dan Sullivan | May 2003 | OSU Extension Catalog

Nitrogen-fixing trees “eat” rocks, play pivotal role in forest health

By tapping nutrients from bedrock, red alder trees play a key role in healthy forest ecosystems.

Chris Branam | Feb 25, 2019 | News Story

New ‘droughty’ soils model for Pacific Northwest could aid forest health in changing climate

Scientists have developed a new approach to modeling potentially drought-prone soils in Pacific Northwest forests, which could aid natural resource managers to prepare forested landscapes for a changing climate.

Chris Branam | Aug 16, 2018 | News Story

Predicting Nitrogen Availability from Organic Amendments: laboratory, Field, and Computer Stimulation

A study to improve the ability to predict nitrogen availability from organic soil amendments, including improved accuracy of Nitrogen availability estimates, to target amendment application rates to meet crop N needs.

Dan Sullivan, E.S. Gale, Delbert Hemphill, Craig Crogger, Andy Bary, E.A. Myhre | Apr 2018 | Publication

Nitrogen Fertilizer: Where Does it Go?

Most Christmas tree growers fertilize with nitrogen (N) intending to improve tree color, growth, and ultimately value. Where does the fertilizer go after application? How much is actually taken up by the trees, stored in the ...

Chal Landgren, Michael Bondi, Steve Webster, Rick Fletcher | Jul 1994 | Article

The ABCs of NPK: A fertilizer guide

Nitrogen, phosphorus and potassium aren't just an alphabet soup of chemicals. They are essential plant nutrients that, when used correctly, help to grow a healthy garden. Learn what fertilizers to apply when in this handy guide.

Lisa Ehle | Jun 2018 | Article

Estimating Nitrogen & Dry Matter From Cover Crops

Cover crops are used by many farmers, but very few know how much nitrogen (N) or dry matter they are getting from their cover crops. There are some methods in the literature for estimating cover crop contributions. We are ...

Nick Andrews | Apr 2007 | Article

Noble fir seedling survival strategies

Applied research to increase survival of noble fir Christmas tree seedlings during drought years, North Willamette Research and Extension Center.

Judy Kowalski, Chal Landgren | Jan 2020 | Article

Nitrogen Management for Hard Wheat Protein Enhancement

Land-grant soil scientists in the Pacific Northwest have written this publication to share information and to relate in-depth the wheat and N management issues related to grain protein enhancement. The focus is on irrigated wheat, but many of the principles will apply to rain-fed wheat as well.

Mar 2005 | OSU Extension Catalog

Drought hits Douglas-fir trees hard

Diseases and pests take advantage of trees' weakened condition

Mary Stewart | May 29, 2015 | News Story