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Nitrogen Fertilization of Meadowfoam¹

Limnanthes alba Benth. is a potential oil seed crop with unique long chain fatty acids. Information available on the fertility needs for meadowfoam is scarce. Therefore the effects of rate and time of application of N fertilization on seed yield, seed weight, protein, oil, winter survival, flowering date, plant height, and erectness of meadowfoam were studied in the field for 2 years in Maryland. Nitrogen as ammonium nitrate was applied on plots of two plant introductions at the rates of 0, 45, and 90 kg/ha in the fall (planting) or early spring. In 1976, N was also applied in both fall and spring

The seed yield of meadowfoam was decreased as much as 24% with the addition of 90 kg N/ha. Seed yield was linearly related to N application. For each 10 kg/ha applied, the seed yield decreased approximately 3%. The time of N application had no significant effect on seed yield. Seed weight was not affected by rate or time of N application. The protein content of the seed was directly related to the rate of N applied with an increase of 1 and 30%, for each 10 kg N/ha in PI 374790 and 374800, respectively. The combined fall and spring application of N resulted in a 5 and 10% increase in the protein content over the individual fall and spring application, respectively. The addition of 90 kg N/ha resulted in a 12% average reduction in the oil content of the seeds. The time of N application did not affect the oil content for either year. The correlation between seed weight and oil content was positive, r = 0.92 (at the 0.01 level). Increasing N fertilization resulted in significant decrease in seed yield and oil content but an increase in protein content.

Key Words: Limnanthes alba • Seed yield • Protein content • Oil content

² Assistant professor (now assistant professor, Dep. of Agronomy, Georgia Stn., Experiment, GA 30212) and formerly graduate research assistant, Univ. of Maryland, College Park, MD; research leader, North Regional Res. Center, Peoria, IL 61601; research agronomist, Plant Genetics and Germplasm Institute, SEA-FR, USDA. Beltsville, MD 20705, respectively.

Received for publication October 9, 1979.