Response of rapeseed fatty acid composition to foliar application of humic acid under different plant densities
In order to the assessment of humic acid application on the qualitative characteristics of rapeseed in various plant densities, a factorial split-plot test was conducted for two cultivation years in Karaj, Iran. In this experiment, plant density considered in three levels (40, 60, and 80 plants/m2), humic acid at two concentrations (non-application and application at the concentration of 0.3%) in the main plots, and six cultivars of rapeseed embracing RGS003, Zafar, Julius, Jerry, Zabol10, and Hyola4815 in the sub-plots. The interaction effect of plant density ×humic acid × cultivar on seed yield, oil yield, oleic acid, linolenic acid, linoleic acid, palmitic acid, erucic acid, canopy temperature, and seed glucosinolate content as well as the interaction effect of plant density × cultivar on the oil content and total chlorophyll content were significant at 1% level. Cv. Jerry had the maximum seed and oil yields under humic acid application condition with the density of 40 plants/m2, and the maximum contents of oleic, linoleic, and palmitic fatty acids as well. Moreover, this cultivar, through containing the lower and standard content of erucic acid and glucosinolate, is recommendable under the circumstance of the present research.
Abedi T., Pakniyat H. (2010): Antioxidant enzyme changes in response to drought stress in ten cultivars of oilseed rape (Brassica napus L.). Czech Journal of Genetics and Plant Breeding, 46: 27–34. https://doi.org/10.17221/67/2009-CJGPB
Azadmard-Damirchi S., Savage G.P., Dutta P.C. (2005): Sterol fractions in hazelnut and virgin olive oils and 4,4'-dimethylstrols as possible markers for detection of adulteration of virgin olive oil. Journal of the American Oil Chemists Society, 82: 717–725. https://doi.org/10.1007/s11746-005-1133-y
Badri A.R., Shiran Rad A.H., Zadeh S.S., Bitarafan Z. (2011): Sowing date effect on spring safflower cultivars. International Journal of Science and Advanced Technology, 1: 139–144.
Chris W., Anderson N., Stewart R.B. (2005): Soil and foliar application of humic acid for mustard production. Environmental Pollution, 254–257.
Enjalbert J.-N., Zheng S.S., Johnson J.J., Mullen J.L., Byrne P.F., McKay J.K. (2013): Brassicaceae germplasm diversity for agronomic and seed quality traits under drought stress. Industrial Crops and Products, 47: 176–185. https://doi.org/10.1016/j.indcrop.2013.02.037
Fernandez-Martinez J. (2002): Sesame and Safflower Newsletter. No. 17. Córdoba, Institute of Sustainable Agriculture.
Gecgel U., Demirci M., Esendal E., Tasan M. (2007): Fatty acid composition of the oil from developing seeds of different cultivars of safflower (Carthamus tinctorius L.). Journal of the American Oil Chemists' Society, 84: 47–54. https://doi.org/10.1007/s11746-006-1007-3
Giasuddin A.B.M., Kanel S.R., Choi H. (2007): Adsorption of humic acid onto nanoscale zerovalent iron and its effect on arsenic removal. Environmental Science and Technology, 41: 2022–2027. https://doi.org/10.1021/es0616534
Jaberi H., Lotfi B., Jamshidnia T., Fathi A., Olad R., Abdollahi A. (2015): Survey of yield of winter canola cultivars under drought stress on the yield at four different phonological stages. Scientia Agriculturae Bohemica, 12: 144–148.
Kadivar S.H., Ghavami M., Gharachorloo M., Delkhosh B. (2010): Chemical evaluation of oil extracted from different varieties of colza. Journal of Food Technology and Nutrition, 7: 19–29.
Khajehpour M.R. (2006): Principles and Fundamentals of Crop Production. Mashhad, Jahad-e Daneshgahi Isfahan Press, 654. (In Persian)
Lääniste P., Joudu J., Eremeev V., Mäeorg E. (2008): Effect of sowing date and increasing sowing rates on plant density and yield of winter oilseed rape (Brassica napus L.) under Nordic climate conditions. Acta Agriculturae Scandinavica, Section B – Soil and Plant Science, 58: 330–335.
Makkar H.P.S., Siddhuraju P., Becker K. (2007): Plant Secondary Metabolites. Totowa, Humana Press, 58–60. ISBN 978-1-59745-425-4
Möllers C., Schierholt A. (2002): Genetic variation of palmitate and oil content in a winter oilseed rape doubled haploid population segregating for oleate content. Crop Science, 42: 379–384. https://doi.org/10.2135/cropsci2002.3790
Nardi S., Pizzeghello D., Muscolo A., Vianello A. (2002): Physiological effects of humic substances on higher plants. Soil Biology and Biochemistry, 34: 1527–1536. https://doi.org/10.1016/S0038-0717(02)00174-8
Nasiri A., Samdaliri M., Shirani Rad A.H., Mosavi Mirkale A., Jabbari H. (2017): Influence of humic acid, plant density on yield and fatty acid composition of some rapeseeds cultivars during two years. Journal of Agricultural Research, 5: 103–109.
Rajpar I., Bhatti M.B., Ul-Hassan Z., Shah A.N. (2011): Humic acid improves growth, yield and oil content of Brassica compestris L. Pakistan Journal of Agriculture, Agricultural Engineering and Veterinary Sciences, 27: 125–133.
Robertson M.J., Holland J.F. (2004): Production risk of canola in the semi-arid subtropics of Australia. Australian Journal of Agricultural Research, 55: 525–538. https://doi.org/10.1071/AR03219
Starner D.E., Hamama A.A., Bhardwaj H.L. (2002): Prospects of Canola as an Alternative Winter Crop in Virginia. Alexandria, ASHS Press.
Sulisbury P., Sang J., Cawood R. (1987): Genetic and environmental factors influencing glucosinolate content in rapeseed in southern Australia. In: Proceeding of the 7th International rapeseed congress, Poland. Poznan, The Plant Breeding and Acclimatization Institute, 516–520.
Tan K.H. (2003): Humic Matter in Soil and the Environment. New York, Marcel Dekker, 408. ISBN 0-8247-4272-9 408