Revised May 1985. Reprinted January 2000. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalogGood management practices are essential if optimum fertilizer responses are to be realized. These practices include adequate irrigation, use of recommended varieties, selection of adapted soils, weed control, disease and insect control, good seedbed preparation, proper seeding methods, and timely\ud harvest. Follow recommended soil sampling and testing procedures to estimate fertilizer needs. The Oregon State University Extension Service agent in your county can provide you with soil sampling instructions, sampler bags, and information sheets. Note: For fertilizer suggestions for irrigated sp...