Christmas tree needle sampling to evaluate nutrient need is an established practice. Data to support the recommended fall sampling time in Oregon and Washington was not found. In addition, the recommendation for needle sampling of Fraser fir in North Carolina was made without data from winter months. The goal for...
Soil testing for a perennial crop, especially a crop new to Oregon such as grapes, raises three common questions from growers: is a soil test desired, how many samples are needed and what do the results indicate? Soil samples are needed before planting a vineyard. These samples provide a record...
The comfortable, sunny climate and numerous
recreational activities east of the Cascade Mountain
Range in Oregon and Washington attract many
new residents each year. Unfortunately, these new residents
often fi nd that their previous gardening experience doesn’t
translate into success in their new environment. Long-time
residents also are frustrated by...
In 2 consecutive years, ground beetles (Coleoptera: Carabidae) were sampled in commercial organic and conventional potato fields, using pit fall traps. Four conventional and 3 organic potato fields were surveyed to determine ground beetle taxa composition. In a related study, potato fields were assigned to 1 of 4 transitional systems...
The use of management units for soil testing and nutrient application is an
effective strategy to increase accuracy in monitoring and managing nitrogen (N), phosphorus (P), and other nutrients. A management unit can be a group of fields, a single field, or an area within a field. To measure changes...
Nitrogen can be lost when the quantity of available nitrogen exceeds crop demand or nitrogen availability is not in synchrony with crop demand. Either situation results in accumulation of available nitrogen, primarily in the nitrate form, at the end of the growing season. Over-winter nitrogen loss occurs primarily as nitrate-...
Rhododendrons and blueberries are popular
plants in home gardens in western Oregon and
Washington. Both are easy to grow in most
gardens, but problems with growth can occur if
the soil is not sufficiently acidic. Even in the
naturally acidic soil west of the Cascade Mountains,
soil often is not...
Revised March 1994. Reprinted January 2000. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog