Source
Weed 'Em and Reap Part 2: Reduced tillage strategies for vegetable cropping systems [DVD]. A. Stone. 2006. Oregon State University Dept. of Horticulture. Corvallis, Oregon. Available at: http://www.weedemandreap.org (verified 17 Dec 2008).
Featuring
Mark Schonbeck. Virginia Association for Biological Farming. Floyd, VA.
Audio Text
Winter-Killed Cover Crops
Photo by Lane Selman
Revised March 2006
Peter Boches, Deborah Kean, Paul Kusolwa, Jim Myers, Jack Stang
Revised March 2005
Revised March 2003.
Last revised February 11, 2010
Lettuce is produced on both mineral and muck (organic) soils. Production practices and varieties are quite different for each soil type. This guide is directed to mineral soil production unless indicated otherwise.
Four morphological types of lettuce dominate U.S. production, these are crisphead, cos (or romaine), leaf, and butterhead. Two others, stem and Latin are rarely found, although stem lettuce may be found in Oriental food stores.
OSU Vegetable Variety Trials 2008
Vegetables: beets, broccoli, cabbage, carrots, cauliflower, corn, cucumbers, greens, kohlrabi, lettuce, melons, onions and shallots, potatoes, pumpkins and gourds, radishes, spinach, squash, swiss chard, tomatoes, turnips, watermelons
Authors: Peter Boches, Miles Barrett, Shawna Zimmerman, Deborah Kean, and Jim Myers, Oregon State University
The purpose of this study was to investigate the effect of several combinations of soil pH and nitrogen fertilizer rates on yield and mineral uptake of bush beans, carrots, and crisphead lettuce. Of particular concern are the nutrient elements potassium, calcium, phosphorus, magnesium, zinc, and copper, and heavy metals such as manganese which may be toxic to plants if present in sufficient quantity. Optimal soil pH levels are not well known for many vegetable crops and probably vary with soil type, cation exchange capacity, amount of organic matter etc.
