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This article in AJ

  1. Vol. 103 No. 4, p. 1152-1158
     
    Received: Jan 12, 2011


    * Corresponding author(s): j.hamzei@basu.ac.ir
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doi:10.2134/agronj2011.0018

Seed, Oil, and Protein Yields of Canola under Combinations of Irrigation and Nitrogen Application

  1. Javad Hamzei *
  1. Department of Agronomy and Plant Breeding, Faculty of Agriculture, Bu-Ali Sina University, Postal Code: 6517833131, Hamedan, Iran

Abstract

Canola (Brassica napus L.), an important oilseed crop in Iran, is intensively managed with high inputs of N and irrigation water. Understanding N and water use characteristics of canola will help improve N and water use efficiency (WUE) and reduce production costs. Here, the effects of irrigation levels (IL1, 750; IL2, 450; and IL3, 300 mm water ha−1) and N rates (NR1, 0; NR2, 40; NR3, 80; NR4, 120; and NR5, 160 kg N ha−1) on canola production are evaluated during 2006 and 2007 growing seasons. Data showed that irrigation levels and N rates and their interaction had significant effects on WUE for seed, oil, and protein as well as seed, oil, and protein yields/ha. The maximum values of seed, oil, and protein yields ha−1, WUE for these traits and seed weight plant−1 were achieved at IL2 × NR4 treatment. The highest values of seed N concentration and seed N uptake were produced at IL2 treatment. Among N rates, maximum averages of seed and straw N concentration were observed at 160 kg N/ha. The highest significant value of straw N uptake was observed at IL1 treatment. Also, maximum N uptake for both seed and straw was the same at 120 and 160 kg N ha−1. Total N uptake achieved significantly in IL2 × NR4 treatment. With decreasing irrigation water and increasing N rates, N use efficiency decreased significantly. In general, consumption of 450 mm water ha−1 season−1 and supplying 120 kg N ha−1 can produce the highest seed, oil, and protein yields ha−1, while increasing WUE and decreasing N leaching.

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