Nitrogen fertilization effects on lesquerella production |
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| Institution: | 1. Department of Plant Sciences, University of Arizona, Maricopa Agricultural Center, 37860 W. Smith-Enke Road, Maricopa, AZ 85239, USA;2. Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85721, USA;3. USDA-ARS, US Water Conservation Laboratory, Phoenix, AZ 85040, USA;1. Centre for Energy Sciences, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. National University of Sciences and Technology (NUST), 44000 Islamabad, Pakistan;1. Department of Organic and Inorganic Chemistry, Federal University of Ceará, P.O. Box 6021, 60.440-900, Fortaleza, CE, Brazil;2. Technology Center Foundation of Ceará, Prof. Rômulo Proença St., Campus do Pici, 60.455-700, Fortaleza, CE, Brazil;3. Department of Chemical Engineering, Federal University of Ceará, Núcleo de Pesquisas em Lubrificantes, Bl. 1010, 60.455-900, Fortaleza/CE, Brazil;1. Shenzhen Institute of Sustainable Development, Southern University of Science and Technology, Shenzhen, 518055, China;2. Shenzhen Academy of Environmental Sciences, Shenzhen, 518001, China;3. Shenzhen Maritime Safety Administration, Shenzhen, 519032, China;4. Harbin Institute of Technology Shenzhen, Shenzhen, 518055, China;1. Biosystems Engineering Department, 200 Corley Building, Auburn University, Auburn, AL, 36849, USA;2. Technology Advancement and Commercialization, RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709, United States;3. Department of Mechanical Engineering, Auburn University, Auburn, AL, 36849, USA;4. Center for Bioenergy and Bioproducts, 519 Devall Drive, Auburn University, Auburn, AL, 36849, USA |
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| Abstract: | Progress has been made towards the commercialization of Lesquerella fendleri (Gray) Wats. as a fall-planted oilseed crop for the southwestern United States. Research to develop suitable cultural practices for commercial production of lesquerella has been underway since the late 1980s; however, information is limited on the plant’s nitrogen (N) requirement. Field experiments were conducted during two growing seasons to determine the optimum amount and timing of N applications for lesquerella production. Yield results indicate that lesquerella grown on desert soils is strongly influenced by N fertilization. Nitrogen rates as high as 180 kg N ha−1 increased seed yield. Seed oil content decreased as the N rate was increased. The increase in seed yield at the higher N rates generally offsets the decrease in oil content, but oil yields appeared to be near maximum at 180 kg N ha−1. Split-applications of N in the Spring increased seed and oil yields in one of two seasons. Nitrogen had no influence on 1000-seed weight or lesquerolic acid content of the oil. No Spring leaf blade total N level was identified as being related to maximum seed yield. A suggested N management program for lesquerella production is to apply a small portion of N at planting time and the major portion of N in several applications during the period from onset of bloom through full bloom (February–April). |
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