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This article in AJ

  1. Vol. 85 No. 2, p. 188-193
    Received: Feb 6, 1992

    * Corresponding author(s):


Seeding Rate, Nitrogen Fertilization, and Irrigation Effects on Floral Meadowfoam Oil Yield

  1. G. D. Jolliff ,
  2. M. Seddigh,
  3. O. S. Norberg and
  4. T. E. Fiez
  1. D ep. of Agronomy, Univ., of Nebraska, Lincoln, NB 68583-0915
    D ep. of Crop and Soil Sciences, Washington State Univ., Pullman, WA 99164-6420



Increased rates of seeding and N fertilization have accounted for higher yields with new cultivars of several crops. Our objective was to evaluate the new meadowfoam cv. Floral (Limnanthes floccosa Howell subsp. grandiflora Arroyo) × Oregon Limnanthes ORL77-84 (L. alba Hartw. ex Benth. subsp. alba). Combined effects of seeding rate (1.5, 4.0, and 6.5 million seeds ha−1), February applied N topdress rate (0, 80, and 160 kg ha−1), and irrigation (none, pre-bloom, and pre- and post-bloom) were evaluated near Corvallis, Oregon in 1987–1988 and 1988–1989. Seeding rate, N rate, and irrigation effects on all measured variables were independent of each other. Seed yield, seed oil content, and oil yield increased 45, 5, and 50%, respectively, while lodging did not increase as seeding rate increased from 1.5 to 6.5 million seeds ha−1. Increased flower number was the main reason for seed yield improvement when seeding rate was increased. Seed yield, seed oil content, and oil yield decreased slightly when N rate increased from 0 to 80 kg ha−1, and dropped sharply at 160 kg N ha−1, with severe lodging. The highest average yields of seed (1684 kg ha−1) and oil (542 kg ha−1) were achieved with the combination of the highest seeding rate, lowest N fertilizer rate, and pre-bloom irrigation.

Oregon Agric. Exp. Stn. Tech. Paper no. 9826.

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