University of California
Nutrient Management for Vegetable, Fruit & Nut Crops
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Growing walnuts in Oregon. J. Olsen. (2006) Oregon State Univ. Extension Service, EM897.
Nitrogen fertilization recommendation for walnut. P.H. Brown, Q. Zhang, M. Stevenson, R.C. Rosecrane.
Walnut research reports :: tree nutrition (UC Fruit & Nut Research & Information Center website)