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J Agric Food Chem. 2017 Dec 6;65(48):10429-10438. doi: 10.1021/acs.jafc.7b02778. Epub 2017 Nov 17.

Water and Temperature Stresses Impact Canola (Brassica napus L.) Fatty Acid, Protein, and Yield over Nitrogen and Sulfur.

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USDA, Agriculture Research Service, National Soil Erosion Research Lab , 275 South Russell St., West Lafayette, Indiana 47907, United States.
Washington State University , PO Box 646420, Pullman, Washington 99164-6420, United States.
International Plant Nutrition Institute , 3500 Parkway Lane, Suite 550, Peachtree Corners, Georgia 30092-2844, United States.


Interactive effects of weather and soil nutrient status often control crop productivity. An experiment was conducted to determine effects of nitrogen (N) and sulfur (S) fertilizer rate, soil water, and atmospheric temperature on canola (Brassica napus L.) fatty acid (FA), total oil, protein, and grain yield. Nitrogen and sulfur were assessed in a 4-yr study with two locations, five N rates (0, 45, 90, 135, and 180 kg ha-1), and two S rates (0 and 17 kg ha-1). Water and temperature were assessed using variability across 12 site-years of dryland canola production. Effects of N and S were inconsistent. Unsaturated FA, oleic acid, grain oil, protein, and theoretical maximum grain yield were highly related to water and temperature variability across the site-years. A nonlinear model identified water and temperature conditions that enabled production of maximum unsaturated FA content, oleic acid content, total oil, protein, and theoretical maximum grain yield. Water and temperature variability played a larger role than soil nutrient status on canola grain constituents and yield.


canola; fatty acid; oil; protein; soil; stress; temperature; water

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