This publication focuses on using water analyses to choose appropriate water treatment and water management practices for irrigated agriculture. It will help determine:
• What tests are needed to characterize water quality
• How to collect water samples
• How to interpret analytical data from a laboratory
• How to...
The potato tuberworm, Phthorimaea operculella, is a pest of many solanaceous crops, including potatoes. Commonly found in tropical and subtropical regions throughout the world, potato tuberworm (PTW) is one of the most important constraints to potato production worldwide. Larvae of this species mine leaves, stems, and petioles and excavate tunnels...
Published January 2007. Reviewed July 2016. Please check for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Tree vigor is important because more leaves mean more carbohydrate production and larger cherries. The production of high-quality cherries requires a gross canopy leaf area-to-fruit ratio of at least 200 cm2 of leaf area per fruit, which roughly translates to five leaves per fruit. Trees with a lower LA:F ratio...
Lingonberries are in the genus Vaccinium and are closely related to highbush blueberries (Vaccinium corymbosum L.) and cranberries (V. macrocarpum L.).
Lingonberries are well suited to cooler climates and can be expected to do well in regions where blueberries and cranberries are productive. Lingonberries are native to
Scandinavia, Europe, Alaska,...
Generally, surveying means gathering and processing information about the physical earth. It’s the science of determining relative positions of existing points on the earth’s surface or of establishing such points. Methods range from aerial and satellite systems to conventional ground methods. Survey professionals use a variety of methods to produce...
Commercially managed honey bees pollinate a variety of crops in the Pacific Northwest, including tree fruits, berries, cucurbits, and crops grown for seed. This activity is economically significant. In 2004, the value of bee-pollinated crops in the region was approximately $1.7 billion. Nationally, the value of bee-pollinated crops in 2000...
Hens stop laying eggs for a variety of reasons. External or internal stimuli affect hormone levels, which change the condition of the ovary and oviduct, the organs responsible for egg production. The result of these changes is the reduction or cessation of egg production. The most common stimuli that affect...
This publication focuses on how to design a soil nutrient monitoring strategy that fits today’s requirements for record keeping and increased accuracy in managing nitrogen (N), phosphorus (P), and other nutrients. We advocate the use of management units or zones for soil testing and nutrient application. To measure a real...
This publication provides basic information on tree growth, characteristics that define wood quality, and the implications of common silvicultural (tree tending) activities on wood quality. It is at best a summary—tree growth is an immensely complex process, and not all aspects of wood formation are fully understood. Most of the...