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Seeding Rate, Nitrogen Fertilization, and Irrigation Effects on Floral Meadowfoam Oil Yield
Author(s) -
Jolliff G. D.,
Seddigh M.,
Norberg O. S.,
Fiez T. E.
Publication year - 1993
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1993.00021962008500020005x
Subject(s) - seeding , human fertilization , yield (engineering) , irrigation , agronomy , biology , nitrogen , fertilizer , bloom , cultivar , zoology , horticulture , chemistry , ecology , materials science , organic chemistry , metallurgy
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.