油菜
芸苔属
油酸
农学
硫黄
产量(工程)
氮气
营养物
化学
脂肪酸
肥料
生物
材料科学
生物化学
有机化学
冶金
作者
W. Ashley Hammac,Tai McClellan Maaz,Richard Koenig,Ian C. Burke,William L. Pan
标识
DOI:10.1021/acs.jafc.7b02778
摘要
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.
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