Seeding Rate, Nitrogen Fertilization, and Irrigation Effects on Floral Meadowfoam Oil Yield
1993
Jolliff, G. D. | Seddigh, M. | Norberg, O. S. | Fiez, T. E.
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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