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Nitrogen Fertilization of Meadowfoam

Johnson, J. W., Devine, M. B., Kleiman, R., White, G. A.
Agronomy journal 1980 v.72 no.6 pp. 917
Limnanthes alba, plant nutrition, nitrogen, fertilizer application, ammonium nitrate, application rate, application timing, oilseed crops, oil crops, seeds, yields, protein content, lipid content, plant growth, winter hardiness
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 springThe 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.