Browse Field Crops Resources

Lynn Ketchum
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Lime Requirement Buffer pH Update 2019

This fact sheet describes recent discrepancies between SMP and Sikora buffer pH lime requirement tests for western Oregon soils and provides recommendations for what to do. Many soil testing labs in the U.S. are switching from the SMP to the Sikora buffer test for lime requirement in an effort to reduce the use of carcinogenic chemicals in the procedure. Wide-scale testing has shown good correlations between the SMP and Sikora tests, however some soils in western Oregon may not follow this pattern. Some soil testing labs serving Oregon are showing higher buffer test values from the Sikora test than the SMP test, while other labs are not reporting a difference between the two tests. Research is on-going and updated buffer pH recommendations are expected next year.

By Nicole Anderson, | Fact Sheet

Selecting Successful Cover Crops for Your Hop Yard

This fact sheet is designed to help guide commercial hop growers in selecting cover crops. The guide discusses benefits and considerations or cons for four different cover crop strategies: annual fall planted, annual spring planted, annual re-seeding and perennial sod. Cover crop suggestions are tailored to western Oregon climate and regional cropping practices.

By Betsy Verhoeven, | Fact Sheet


Cultivating Healthy Farms, Forests, Food and Families in Polk County.


Spring Grains: Western Oregon—West of Cascades Fertilizer Guide

Based on soil test results, recommends amounts of fertilizer and lime needed for spring grains in western Oregon.

OSU Extension Catalog

Tall Fescue Grown for Seed: A Nutrient Management Guide for Western Oregon

This guide covers key nutrient management topics related to tall fescue grown for seed in western Oregon. Crop growth and timing of nutrient uptake is covered. Specific recommendations for nitrogen, phosphorous, potassium, sulfur, and soil pH provided. A number of appendices address micronutrients,...

By Nicole Anderson | OSU Extension Catalog

Perennial Ryegrass Grown For Seed (Western Oregon) Nutrient Management Guide

This guide provides nutrient and lime recommendations for establishment of turf and forage perennial ryegrass grown for seed in western Oregon. Healthy plants with adequate root systems are required to obtain the greatest return from your fertilizer investment. The nutrient recommendations in this...

By Cynthia Ocamb, Nicole Anderson | OSU Extension Catalog

Applying Lime to Raise Soil pH for Crop Production (Western Oregon)

This publication describes how to estimate lime application rate and lists criteria for choosing liming materials (source), lime application method (placement), and how often to apply lime (frequency).

By Dan Sullivan, Gene Pirelli, Nicole Anderson | OSU Extension Catalog

Postharvest Residue Management for Grass Seed Production in Western Oregon

This publication incorporates 20 years of field research by OSU faculty comparing two grass-seed residue management methods: full straw load (straw is chopped and left on the field) and clean nonthermal (straw is baled and removed from the field). Comparison includes discussion of seed yield and...

By Tom Silberstein, Andy Hulting, Nicole Anderson | OSU Extension Catalog

Peppermint (Western Oregon) Nutrient Management Guide

Nutrient management guide for peppermint in western Oregon.

By Dan Sullivan, Andy Hulting | OSU Extension Catalog

Using the Nitrogen Mineralization Soil Test to Predict Spring Fertilizer N Rate for Soft White Winter Wheat Grown in Western Oregon

Soft white winter wheat is grown in western Oregon and requires a spring application of nitrogen (N) fertilizer for optimum production. Determining the amount of N to apply has been a challenge for growers. Wheat obtains N from two sources: soil and fertilizer. Both available and mineralizable N can...

By Nicole Anderson | OSU Extension Catalog