Differences in severity by variety and seed source can be large. These practices include use of recommended pea varieties, selection of adapted soils, weed control, disease and insect control, good seed bed preparation, proper seeding methods, and timely harvest. Because of the influence of soil type, climatic conditions, and cultural practices, crop response from fertilizer may not always be accurately predicted. 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 vegetable crops should insure adequate levels of all nutrients.
Optimum fertilization is essential for top quality and yields.
Recommended soil sampling procedures should be followed in order to estimate fertilizer needs. The Oregon State University Extension Service agent in your county can provide you with soil sampling instructions and soil sample bags and information sheets. Peas have the capacity to fix atmospheric nitrogen, and have been shown to use this nitrogen more effectively than applied N. The application of N at rates higher than those indicated may be detrimental to nitrogen fixation by the plant and yields. A fresh, effective, live culture of the correct strain of Rhizobium should be used. Phosphorus is essential for vigorous early growth of seedlings.