Document Type : Research Paper


Associate Professor, Department of Agronomy and Horticulture, Agriculture and Natural Resources Research and Education Center of Golestan, Gorgan, Iran


To study the effects of used water in evapotranspiration, seed number per unit area and leaf relative water content on seed weight of canola (Brassica napus L.), an experiment was conducted as a randomized complete block design, arranged in a split-plot under two conditions, i.e. supplemental irrigation and rainfed in 2005-7. Two cultivars of canola (‘Hyola401’ and ‘RGS003’) as subplots were grown at five sowing dates as main plots, spaced 30 days apart. There was a linear relationship between seed weight and used water in evapotranspiration. Irrigation increased seed weight and seed yield significantly. The mean 1000- seed weight under irrigation and rainfed conditions was 3.2 and 2.7g in 2005-6, and 4.2 and 3.7g in 2006-7. There was a strong linear relationship between seed weight and leaf relative water content, explaining 92 and 84 percent of the variation for ‘Hyola401’ and ‘RGS003’, respectively. For an each percent increase in leaf relative water content, 1000-seed weight of ‘Hyola401’ and ‘RGS003’ increased 0.191 and 0.146g, respectively. The strong relationships of seed weight with used water in evapotranspiration and leaf relative water content, over different environmental conditions and cultivars, showed these variables to be generally applicable in canola seed weight determination


1 . سلطانی ا (1385) تجدید نظر در کاربرد روش‌های آماری در تحقیقات کشاورزی. انتشارات جهاد دانشگاهی مشهد. 74 ص.
2 . سلطانی ا (1386) کاربرد نرم­افزار SAS در تجزیه‌های آماری. انتشارات جهاد دانشگاهی مشهد. 182 ص.
3 . سلطانی ا و فرجی ا (1386) رابطۀ آب خاک و گیاه. انتشارات جهاد دانشگاهی مشهد. 246 ص.
4 . عزیزی م، سلطانی ا و خاوری س (1378) کلزا، فیزیولوژی، زراعت، به‌نژادی و تکنولوژی زیستی. انتشارات جهاد دانشگاهی مشهد. 230 ص.
5 . فرجی ا و محتشم امیری ا (1392) مدیریت تنش­های محیطی در مزارع کلزا. انتشارات آموزش و ترویج کشاورزی. 137 ص.
6 . Acreche MM and Slafer GA (2006) Grain weight response to increase in number of grains in wheat in a Mediterranean area. Field Crops Research. 98: 52-59.
7 . Adamsen FJ and Coffelt TA (2005)Planting date effects on flowering, seed yield, and oil content of rape and crambe cultivars. Industerial Crops Production. 21: 293-307.
8 . Aguirrezabal LAN, Lavud Y, Dosio GAA, Izquierdo NG, Andrade FH and Gonzalez LM (2003) Intercepted solar radiation during seed filling determines sunflower weight per seed and oil concentration. Crop Science. 43:152-161.
9 . Berry PM and Spink JH (2006) A physiological analysis of oilseed rape yields: Past and future. Journal of Agriculture Science. 144: 381-392.
10 . Borras L, Slafer GA and Otegui ME (2004) Seed dry weight response to source-sink manipulations in wheat, maize and soybean: a quantitative reappraisal. Field Crops Research. 86:131-146.
11 . Brandt SA and McGregor DI (1997) Canola response to growing season climatic conditions. P 322-328. In: Proc. Workshop on Soils and Crops 97, Saskatoon, SK, Canada.
12 . Caliskan ME, Caliskan M, Arslan M and Arioglu H (2008) Effects of sowing date and growth duration on growth and yield of groundnut in a Mediterranean-type environment in Turkey. Field Crops Research. 105: 131-140.
13 . Clayton GW, Harker KN, O’Donovan JT, Blackshaw RE, Dosdall LM, Stevenson FC and Ferguson T (2004) Fall and spring seeding date effects on herbicide-tolerant canola (Brassica napus L.) cultivars. Canadian Journal of Plant Science. 84: 419-430.
14 . Del Moral LFG, Rharrabti Y, Villegas D and Royo C (2003) Evaluation of grain yield and its components in drum wheat under Mediterranean conditions: An ontogenic approach. Agronomy. 95: 266-274.
15 . Egli DB (2004) Seed-fill duration and yield of grain crops. Advances in Agronomy. 83: 243-279.
16 . Faraji A (2012) Oil concentration in canola (Brassica napus L.), as a function of environmental conditions during seed filling period. International Journal of Plant Production. 2: 267-277.
17 . Faraji A, Latifi N, Soltani A and Shirani Rad AH (2009) Seed yield and water use efficiency of canola (Brassica napus L.) as affected by high temperature stress and supplemental irrigation. Agricultural Water Management. 96: 132-140.
18 . Gan Y, Angadi SV, Cutforth H, Potts D, Angadi VV and McDonald CL (2004) Canola and mustard response to short periods of temperature and water stress at different developmental stages. Canadian Journal of Plant Science. 84: 697-704.
19 . Gonzalez FG, Slafer GA and Miralles DJ (2005) Floret development and survival in wheat plants exposed to contrasting photoperiod and radiation environments during stem elongation. Functional Plant Biology. 32: 189-197.
20 . Hall AE (1992) Breeding for heat tolerance. Plant Breeding Review. 10: 129-168.
21 . Haro RJ, Otegui ME, Collino DJ and Dardanelli JL (2007) Environmental effects on seed yield determination of irrigated peanut crops: Links with radiation use efficiency and crop growth rate. Field Crops Research. 103: 217-228.
22 . Harper FR and Berkenkamp B (1975) Revised growth-stage key for Brassica campestris and Brassica napus. Canadian Journal of Plant Science. 55: 657-658.
23 . Johnston AM, Tanaka DL, Miller PR, Brandt SA, Nielsen DC, Lafond GP and Riveland NR (2002) Oilseed crops for semiarid cropping systems in the Northern Great Plains. Agronomy. 94: 231-240.
24 . Lannucci A and Martiniello P (1998) Analysis of seed yield components in four Mediterranean annual clovers. Field Crops Research. 55: 235-243.
25 . Loss SP and Siddique KHM (1997) Adaptation of faba bean (Vicia faba L.) to dryland Mediterranean-type environment I. Seed yield and yield components. Field Crops Research. 52: 17-28.
26 . Mendham NJ and Salsbury PA (1995) Physiology, crop development, growth and yield. pp 11-64. In: Kimber DS, McGregor DI (eds.). Brassica Oilseeds: Production and Utilization. CAB International, Landon.
27 . Morrison MJ (1993) Heat stress during reproduction in summer rape. Canadian Journal of Botany. 71: 303-308.
28 . Musick JT, Jones OR, Stewart BA and Dusek DA (1994) Water yield relationships for irrigated and dryland wheat in the U.S. Southern Plains. Agronomy. 86: 980-986.
29 . Ruiz RA and Maddonni GA (2006) Sunflower seed weight and oil concentration under different post-flowering source-sink ratios. Crop Science. 46: 671-680.
30 . Zhang HP, Wang XY, You MZ and  Liu CM (1999) Water-yield relations and water use efficiency of winter wheat in the North China plain. Irrigation Science. 19: 37-45.
31 . Zhong-hu H and Rajaram S (1994) Differential responses of bread wheat characters to high temperature. Euphytica. 72: 197-203.