عنوان مقاله [English]
To evaluate the effect of delayed planting and irrigation regimes on yield, yield components and some agronomic traits of winter rapeseed varieties, two separate field experiments (I: optimum irrigation and II: terminal drought) carried out as split plot arrangements in randomized complete block design with three replications in 2014-2016 cropping seasons at Zarghan field station, Agricultural and Natural Resources Research and Education Center of Fars, Iran. In each experiment three planting dates (07, 17 and 27 October) and four winter rapeseed varieties; two open pollinated cultivars (Talayeh and Okapi) and two hybrids (Neptune and Elvis)) were assigned to main plot and randomized in subplot, respectively. The results indicated significant effect of irrigation and variety on all traits.The effect of planting date was significant on all traits except 1000 seed weight and number of seed per pod. Terminal drought decreased plant height, days to maturity, seed yield and yield components. The decrease in seed yield by terminal drought and delayed planting was 23.9 and 18.4%, respectively. The reduction of 17.2% of seed no. per pod by terminal drought stress and 16.2% of pods per plant by delayed planting caused yield reduction. The results also showed that the effect of terminal drought stress on seed yield and harvest index was much higher than the delay in planting. Tallayeh which maintained seed yield superiority under different conditions can be recommended as the suitable variety for similar growing conditions.
Ahmadi, M., and Bahrani, M. J. 2009. Yield and yield components of rapeseed as influenced by water stress at different growth stages and nitrogen levels. American Eurasian Journal of Agricultural and Environmental Science 5(6): 755-761. Bagheri, M., Yavarof, O. M., and Salehi, M. 2016. Delay cropping effect on yield, yield component, grain oil content of two canola (Brassica napus L.) cultivars. Crop Production 9(2): 93-110 (in Persian). Barnabás, B., Jäger, K., and Fehér, A.2008. The effect of drought and heat stress on reproductive processes in cereals. Plant, Cell & Environment 31(1): 11-38. Begna, S. H., and Angadi S. V. 2016. Effects of planting date on winter canola growth and yield in the south western United State of America. American Journal of Plant Sciences 7: 201-217. Daryanto, S., Wang, L., and Jacinthe, P. A. 2016. Global synthesis of drought effects on maize and wheat production. Plos One 11(5): 1-15. Fanaei, H. R., Galavi, M., Kafi, M., Ghanbari Bonjar, A., and Shirani-Rad, A. H. 2009. Effects of potassium fertilizer and irrigation on yield and water use efficiency of canola and Indian mustard species. Iranian Journal of Crop Sciences 11: 273-291 (in Persian). Faostat, F. A. O. 2017. Statistical Databases. Food and Agriculture Organization of the United Nations. http://faostat.fao.org/. Faraji, A. 2016. Response of oilseed rape hybrids and promising lines to sowing date in Gorgan area. Seed and Plant Production 32(1): 65-79 (in Persian). Gan, Y., Angadi, S. V., Cutforth, H., Potts, D., and McDonald, C. L. 2004. Canola and mustard response to short periods of temperature and water stress at different developmental stages. Candian Journal of Plant Science 84(3): 679-704. Hatamvand, M., Hassanloo, T., Dehghan Nayeri, F., Shirani Rad, A. H., Tabatabee, S. A., and Hosseini, S. M. 2015. Evaluation of some physiological and biochemical indices of canola cultivars in response to drought stress. Journal of Environmental Stresses in Crop Science 7(2): 1172-185 (in Persian). Kahrizi, D., and Allahvand, T. 2012. Estimation and interrelationships of genetic variability parameters of some morpho-phenological traits in spring rapeseed (Brassica napus L.). Asian Journal of Biological Sciences 5(7): 358-364. Khan, F. A., Ali. S, Shakeel, A., Saeed, A., and Abbas, G .2006. Genetic variability and genetic advance analysis of canola (Brassica napus L.) cultivars affected by planting date and water deficit stress. African Journal of Biotechnology. 10:9309-9313. Lesk, C., Rowhani, P., and Ramankutty, N. 2016. Influence of extreme weather disasters on global crop production. Nature 529: 84-87. Lobell, D. B., Schlenker, W., and Costa-Roberts, J. 2011. Climate trends and global crop production since 1980. Science 333( 6042): 616-620. Luo, X., Ma, C., Yue, Y., Hu, K., Li, Y., Duan, Z., Wu, M., Tu, J., Shen, J., Yi,B., and Fu, T. 2015. Unravelling the complex trait of harvest index in rapeseed (Brassica napus L.) with association mapping. BMC Genomics 16: 379. McKenzie, R. H., Bremer, E., Middleton, A. B., Pfiffner, P. G., and Woods, S. A. 2011. Optimum seeding date and rate for irrigated cereal and oilseed crops in southern Alberta. Canadian Journal of Plant Science 91: 293-303. Monajem, S., Ahmadi, A., and V. Mohammadi. 2011. Effect of drought stress on photosynthesis, partitioning of photoassimilates and grain yield in rapeseed cultivars. Iranian Journal of Crop Sciences 13 (3): 533-547 (in Persian). Noreen, S., Noor, S., Ahmad, S., Bibi, F.,and Hasanuzzaman, M. 2016. Quantifying some physiological and productivity indices of canola (Brassica napus L.) crop under an arid environment . Notulae Botanicae Horti Agrobotanici Cluj-Napoca 44(1): 272-279. Rameeh, V., and Amoli, N. 2015. Relationship among yield and component characters in different planting dates of rapeseed genotypes. Research on Crop Ecophysiology 10(1): 17-24. Robertson, M. J., Holland, J. F., and Bambach, R., 2004. Response of canola and Indian mustard to sowing date in the grain belt of north-eastern Australia. Australian Journal of Experimental Agriculture 44 (1): 43-52. Said-Al Ahl, H. A. H., Mehanna, H. M., and Ramadan, M. F. 2016. Impact of water regime and phosphorus fertilization and their interaction on the characteristics of rapeseed (Brassica napus L.) and fatty acid profile of extracted oil. Communications in Biometry and Crop Science 11 (1): 64-76. Seyed Ahmadi, A., Bakhshandeh, A., and Gharineh, M. H. 2015. Evaluation physiological charasteristics and grain yield of canola cultivars under end seasonal drought stress in weather condition of Ahvaz. Iranian Journal of Field Crops Research 13(1): 71-80 (in Persian). Sharifi, Sh., Rezaeizad, A., and Shoshtari, L.2016. Evaluation of grain yield stability of new rapeseed (Brassica napus L.) lines under terminal drought stress conditions. Iranian Journal of Crop Sciences 17(4): 288 -300 (in Persian). Shirani Rad, A. H., and Abbasian, A. 2011. Evaluation of drought tolerance in rapeseed genotypes under non- stress and drought stress conditions. Notulae Botanicae Horti Agrobotanici Cluj-Napoca 39: 164-171. Starner, D. E., Hamama, A. A., and Bhardwaj, H. L. 2002. Prospects of canola as an alternative winter crop in Virginia. Pp. 127-130. In: Jonick, J. and A. Whiskey (eds.). Trends in new crops and new uses.ASHS Press. Alexandria, VA. Tabatabaee, S. A., Ghasemi, A., and Shakeri, E. 2011. Effect of water stress on yield, component yield and oil rate of rapeseed cultivars. Crop Physiology 12: 41-53 (in Persian). USDA .2017. Oilseeds: World markets and trade. United States Department of Agriculture. Washington, USA. Available at: http://www.fas.usda.gov/data/oilseeds-world-markets-and-trade. Wang, S., Wang, E., Wang, F., and Tang, L. 2012. Phenological development and grain yield of canola as affected by sowing date and climate variation in the Yangtze river basin of China. Crop and Pasture Science 63: 478-488. Zebarjadi, A. R., Sartip, A., Najaphy, A., and Rezaeizad, A. 2015. Evaluation of drought tolerance of rapeseed genotypes (Brassica napus L.) using drought resistance indices. Environmental Stress in Crop Sciences 8(2): 345-348 (in Persian). Zirgoli, M. H., and Kahrizi, D.2015. Effects of end-season drought stress on yield and yield components of rapeseed (Brassica napus L) in warm regions of Kermanshah province. Biharean Biologist 9 (2): 133-140.