Abstract:
Good management practices are essential if optimum fertilizer responses are to be realized. The practices include use of recommended onion varieties, selection of adapted soils, weed control, disease and insect control, good seedbed preparation, proper seeding methods, and timely harvest. Because of the influence of soil type, climatic conditions, and other cultural practices, crop response from fertilizer may not always be predicted accurately. Soil test results, field experience, and knowledge of specific crop requirements help determine the nutrients needed and the
rate of application. The fertilizer application for onions should ensure adequate levels of all nutrients. Optimum fertilization is essential for top quality and yields. Fertilizer suggestions are based on a 12–14 inch row spacing. Follow recommended soil sampling procedures to estimate fertilizer needs. The Oregon State University Extension Service agent in your county can provide you with soil sampling instructions, soil sample bags, and information sheets.
